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Home My WebLink About1.16 Preliminary Drainage ReportLake Springs Ranch Subdivision Preliminary Plan/PUD Amendment December 2025 Exhibit 16 | Revised Preliminary Drainage Report (HCE) PRELIMINARY DRAINAGE REPORT FOR LAKE SPRINGS RANCH PUD GARFIELD COUNTY, COLORADO PREPARED FOR: Berkeley Family Limited Partnership 4001 County Road 114 Glenwood Springs, CO 81601 PREPARED BY: High Country Engineering , Inc. 1517 Blake A venue, Suite 101 Glenwood Springs , CO 81601 (970) 945-8676 November 22, 2025 HCE JOB NUMBER: 2221018 .00 15 17 B l ake Avenu e, Sui l e I O I G lenwoo d Spri ngs , CO 8 160 I 97 0.945 .8676 ph one 970.945 .2555 fax w w w.h ce ng .co m 2 | P a g e TABLE OF CONTENTS SECTION PAGE I. Location and Description of Property 3 II. Drainage Basin Criteria 4 III. Drainage Facility Design 4 IV. Existing Basins 7 V. Proposed Basins 8 VI. Results and Recommendations 10 VII. Conclusions 13 VIII. References 13 IX APPENDIX Exhibits 1. Vicinity Map (8.5x11) 2. Existing Basin Map (24x36) 3. Proposed Basin Map 3,3A-3G (3G=Existing Offsite Basins) (24x36) 4. Soils Map(SCS) (11x17) 5. NOAA Map, 2-year (8.5x11) 6. NOAA Map, 25-year (8.5x11) 7. NOAA Map, 100-year (8.5x11) 8. Colorado Mountain College Drainage Agreement Calculations Hydrologic Computations Hydraulic Computations 3 | P a g e I. Location and Description of Property A. Property Location The proposed development, Lake Springs Amended PUD, is an approximately 203.74-acre site with County Road 114 passing along the west perimeter of the property. The property is accessed from Highway 82 via a 4 mile drive up County Road 114. The proposed development consists of 84 single-family lots and 10 multi-family units, with the typical single family lot size being between 0.68 and 1.5 acres. The smallest single-family lot within the subdivision is 0.68 acres. See Exhibit 1 for the Vicinity Map. There is a significant area of offsite drainage affecting this property from the east, west, and south of the property. B. Property Description This proposed development is located on undeveloped pasture/grassland that slopes toward the west to a low-lying area west of the property currently surrounded by a sod farm operation on the Rivendell Distribution property. This Rivendell Distribution property west of County Road 114 is no longer part of the subject property as it was during the time of the previous preliminary plan approval. However, as part of the negotiations of the sale of the property a “Property Use and Easement Agreement” was signed and recorded by the two parties to allow for the use of the Rivendell Distribution property’s mapped low lying area for expanded runoff from the subject property, additional detention volume for the design storm, and adjustments to the north boundary 2-track ranch road on the Rivendell Distribution property to control the release of runoff to County Road 119 and contain the expanded detention volume required for the contributing drainage basins. The design will prevent any increase in runoff to County Road 119 during the design storm event. The release of this detention area connects to the existing County Road 119 drainage infrastructure and eventually makes its way to the Roaring Fork River. The subject property is relatively steep with surrounding steep hills and drainage ways. The historic runoff from the site is collected along County Road 114 and conveyed through culverts to the Colorado Mountain College and Rivendell Distribution property to the west of the County Road 114 before collecting in a shallow pond area that is used for irrigation of the surrounding Rivendell Distribution sod farm operations. The low point of the subject property is the existing landscape pond on the east side of County Road 114. This pond will be reshaped as part of the road improvements and a 36” outfall pipe installed to pass any runoff from the development beyond the normal irrigation high water line across County Road 114 and to the low-lying water storage area west of the Rivendell Distribution buildings. The proposed development is delineated as Zone C from the Flood Insurance Rate Maps, Community Panel 08020514655 B, dated January 3, 1986. Zone C is defined as areas of minimal flooding. 4 | P a g e II. DRAINAGE BASIN CRITERIA A. Regulations AutoCAD’s SCS TR-55 Tabular Method was utilized for this report for onsite and offsite runoff to remain consistent with the Garfield County standards. NOAA Atlas maps for the 25 and 100-year rainfall intensities were used to determine runoff from each basin. Per the NOAA Atlas, the 2-year, 24-hour precipitation amount is 1.2 inches, the 25-year, 24-hour precipitation amount is 2.0 inches and the 100-year, 24-hour rainfall intensity is 2.4 inches. Peak on-site flows for this site will be primarily rainfall derived since the entire site is below 8,000 feet in elevation. Therefore, the storm drainage system should be more than adequate to handle on-site spring snowmelt runoff when sized for the rainfall events. The AutoCAD hydrology channel calculator was used for channel sizing during the 25-year and 100-year storm events. AutoCAD’s pipe calculator was used to size the culverts for the 25-year storm event per the Garfield County’s specifications. Weighted curve numbers based on the soil types and land uses were used to determine the runoff from each of the basins. B. Hydrologic Criteria The proposed development characteristics were broken down to open space, roadways, and proposed development (1.0-acre typical single family lot size). The existing basins were modeled as having open pasture/grasslands in fair condition as well as asphalt/gravel roadways. The proposed site will ultimately undergo grading for the proposed roadways, drainage facilities, and the proposed single-family lot improvements, multifamily lots, and trails. This will add additional impervious areas from the existing condition and increase the curve numbers in most of the onsite basins. III. DRAINAGE FACILITY DESIGN A. Offsite Basin Description Six offsite basins located around the proposed site contribute runoff to the Rivendell Distribution property’s low-lying area. Most of these basins do not affect the proposed lots since they are routed around the proposed development before joining with the onsite runoff on the CMC and Rivendell Distribution property. The offsite basins were analyzed to determine the amount of runoff that ends up in the low-lying portion of the property. The offsite culverts that convey the offsite drainage to the proposed detention pond were not analyzed to determine if they had enough capacity to convey to the proposed ponds since these culverts are outside the scope of our drainage design. The major existing basins (EX-OS1) that is routed south of the subject property to the CMC property has a time of concentration of 113.22 minutes, while the proposed time of concentration for the onsite basins to the to the low end of the overall drainage basin are all below 32 minutes. Therefore, the basins will not peak at the same time when they travel through the CMC property and the low-lying portion of the Rivendell Distribution property where all the basins runoff eventually end up. The lag time will provide 5 | P a g e sufficient time for the proposed onsite drainage runoff to peak west of the subject property before the major existing offsite basin reaches a peak flow. EX-OS1 is about 11 times the size of the entire Lake Springs Ranch and thus the peak flow at the end of the on the Rivendell Distribution low lying area is controlled primarily by the offsite basin. Offsite basin EX-OS1 encompasses the area to east and north of the proposed site. The runoff from basin EX-OS1 drains south to the east of the eastern property boundary of the subject property. The runoff then turns west below the southern property boundary where it crosses beneath County Road 114 via existing culverts. EX-OS1 receives runoff from existing basins EX-2, EX-3, EX-4, and EX-5. EX-OS1 also receives runoff from proposed basins PR-21, PR- 25, PR-27, PR 31, and PR-32. This runoff from EX-OS1 then enters EX-OS6 west of County Road 114 and then travels northwest to the proposed detention pond in basin EX-OS8 within the Rivendell Distribution property. EX-OS6 also receives runoff from the existing landscape/irrigation pond on the east side of County Road 114 that receives all the runoff from basin EX-7. The additional flow generated by the build out of the property will increase the overall flow onto the Colorado Mountain College property that sits within EX-OS6 but there is a signed agreement with the College (Exhibit 8) that allows for a percentage increase in flow during the major runoff events. This has been the path of the existing runoff from the landscape/irrigation pond historically and it was determined that the College had no intention to develop this corner of the property. Offsite basin EX-OS5 is located near the southwestern corner of the property between the subject property boundary and County Road 114. The runoff from this basin drains northwest to a low point and culvert near the east side of the County Road 114. Offsite basin EX-OS5 is located north of basin EX-OS4. Offsite basin EX-OS4 is also in the southwestern corner of the property and drains north into basin PR-17 and is collected by EX-OS6. Offsite basin EX-OS7 includes the most of the steep east side of the Rivendell Distribution property and drains west to the low laying area of the property. All of the offsite basins defined eventually end up in basin EX-OS8 which is a basin that includes land within the existing Rivendell Distribution property including two existing irrigation ponds. This basin will not have any development occurring as part of the subdivision build-out other than some modifications to the outfall of the northern pond to County Road 119 and any necessary culvert improvements to continue existing agricultural operations. The “pasture/grassland-fair” curve number for soil types ‘B’ (CN 69), ‘C’ (CN 79), and ‘D’ (CN 84) and “asphalt” (CN 98) curve numbers were used to create composite curve numbers for each drainage basin. (i 6 | P a g e Table 1: Offsite Basin Composite Curve Number BASIN B Group Soil C Group Soil D Group Soil Impervious Composite CN EX-OS1 44.02% 55.98% - - 75 EX-OS4 - 100.00% - - 79 EX-OS5 85.57% 14.43% - - 71 EX-OS6 49.74% - 49.43% 0.83% 77 EX-OS7 52.29% 30.11 16.95% 0.65% 75 EX-OS8 84.74% - 15.26% - 72 Table 2, below, shows the runoff characteristics for the offsite basins. Sheet flow lengths were set to a maximum 300 feet. Refer to the appendices for more complete calculations. Table 2: Offsite Basin Characteristics BASIN AREA, ACRES TC (MIN) CN Q25-YEAR,CFS Q100-YEAR,CFS EX-OS1 2276.8654 113.22 75 232.43 395.67 EX-OS4 0.7866 11.43 79 0.46 0.70 EX-OS5 7.1042 18.33 71 1.25 2.55 EX-OS6 152.4295 45.61 77 37.19 58.79 EX-OS7 159.2378 35.13 75 37.88 66.30 EX-OS8 254.4295 44.71 72 31.08 61.99 B. Onsite Basin Description Onsite runoff sheet flows to existing drainage paths where it is routed offsite in shallow concentrated flows or is collected in the proposed road network of roadside swales, curb and gutter, and culverts. Each lot will be graded to convey the runoff from the lot to the proposed roadways or through native grasses and landscaping to historic runoff paths. Runoff from the contributing offsite basins will be routed through the proposed onsite basins to their historic discharge points. The proposed Lake Springs Ranch Amended PUD site was designed to carry the 25-year storm event down the roadside swales to proposed culverts throughout the site. In the event of a 100- year storm event, the runoff will be safely conveyed through the property across roads, down property lines, and along the roadside swales to the proposed detention facilities. Detention volume is sized to accommodate the increase in flow between the existing overall 100-year, 24-hour peak runoff versus the proposed overall 100-year, 24-hour peak runoff rates. 7 | P a g e IV. EXISTING BASINS The existing site was broken down into 6 onsite drainage basins that cover the entire property all of which will eventually reach the offsite basin EX-OS8. EX-OS8 includes lowest point of the surrounding runoff and is where most of the offsite and onsite basins are conveyed. There are currently areas of irrigation storage at the lowest points within EX-OS8 on the Rivendell Distribution property which will be utilized and upgraded for any changes in the runoff. Any modifications to the conserved portion of this basin would require approval by the Aspen Valley Land Trust. AVLT has given approval for passing additional flow through the conserved property as long as major grading is not required. The runoff through EX-OS8 flows north across the low-lying portions of the Rivendell Distribution property and is captured in the existing ponds when the rain event flows are large enough. The existing shallow ponds that collect all of the existing runoff are used as a source of irrigation water below the outfall culverts to County Road 119. Existing basins EX-2 and EX-3 are basins on the northeast corner of the subject property that flows east to the offsite basin EX-OS1. Basin EX-4 and basin EX-5 are basins on the south side of the subject property that also flow directly to EX-OS6. Basin EX-6 is on the southeast corner of the property and flows west to EX-OS5. Basin EX-7 is the majority of the subject property which flow west to the irrigation pond along County Road 114 before draining to offsite to basin EX-OS6. The “pasture/grassland-fair” curve number for soil types ‘B’ (CN 69), ‘C’ (CN 79), and ‘D’ (CN 84) and “asphalt” (CN 98) curve numbers were used to create composite curve numbers for each drainage basin. Sheet flow lengths were set to a maximum 300 feet. Table 4, below, shows a summary of the unrouted flows for the existing basins. Refer to the appendices for complete calculations. Table 3: Existing Basin Characteristics Composite Curve Number BASIN B Group Soil C Group Soil D Group Soil Impervious Composite CN EX-2 100.00% - - - 69 EX-3 100.00% - - - 69 EX-4 100.00% - - - 69 EX-5 72.16% 27.84% - - 72 EX-6 - 100.00% - - 79 EX-7 30.11% 67.18% - 2.71% 77 Table 4, below, shows a summary of the unrouted flows for the existing basins. Sheet flow lengths were set to a maximum 300 feet. Refer to the appendices for complete calculations. 8 | P a g e Table 4: Existing Basin Characteristics BASIN AREA, ACRES TC (MIN) CN Q25-YEAR,CFS Q100-YEAR,CFS EX-2 5.9181 15.16 69 0.74 1.64 EX-3 10.9278 14.14 69 1.68 3.70 EX-4 18.7643 18.76 69 2.88 6.35 EX-5 2.1733 14.37 72 0.55 1.07 EX-6 7.3242 18.87 79 3.54 5.42 EX-7 158.6150 30.94 77 48.81 76.93 V. PROPOSED BASINS Overall PUD Proposed Drainage Basin Description The proposed construction within the subject property consists of the construction of roadways, drainage facilities, and residential lots. The lots range in size from approximately 0.68 acres and 1.15 acres. The proposed lots were assumed to be walkout style lots in some cases to determine future the drainage basin lines. The proposed single-family lots will not be overlot graded as part of the subdivision scope of work but for purposes of the drainage study the basin lines fit our expectations of the how the final grading of the lot will be addressed. The 10 multi-family lots will be overlot graded for future building pads. The proposed overall site was broken down into 26 basins. Many of these basins could be combined to create larger basins, but the basins were sized in order to correctly size the proposed culverts throughout the subdivision and to make sure that the roadside swales were sized large enough to handle the flows from the basins when the grading plans for the individual phases of the project are completed. There are a number of basins that will temporarily leave the property before being routed to basin EX-OS8 on the Rivendell Distribution property. These basins do not increase the runoff to EX-OS1 by as there is a reduction in runoff due to the new basin layout on the northeast corner of the property. These basins include PR-21, PR-25, PR-27, PR-31, and PR-32. The rest of the proposed basins either drain directly to EX-OS6 through the northeast corner of the Colorado Mountain College property before entering EX-OS8. These basins that are routed through the CMC property have been approved by CMC to have an increase in flow for the build-out of the property along a defined approximately 1,500 foot long drainage path. AutoCAD’s TR-55 hydrology curve numbers for residential lots of 1-acre were used for all lots, asphalt roads were used for all impervious areas, and pasture/grassland-fair curve numbers were used for all undeveloped areas. The multifamily lot impervious calculations were based on the building footprints and driveways proposed. Composite curve numbers were determined for each basin using the curve numbers previously above within soil types for the undeveloped pasture/grassland areas. The areas within the developed lots will have a curve number for soil types ‘B’ (CN 68), ‘C’ (CN 79), and ‘D’ (CN 84) and “impervious” (CN 98) curve numbers were used to create composite curve numbers for each drainage basin. 9 | P a g e Table 5: Proposed Basin Characteristics Composite Curve Number BASIN Undeveloped -B Group Soil Undeveloped -C Group Soil Undeveloped -D Group Soil Lot – B Group Soil Lot – C Group Soil Lot – D Group Soil Impervious Composite CN PR-7 52.29% 30.11% 16.95% - - - 0.00% 74 PR-8 48.89% - 41.52% - - - 9.59% 78 PR-9 32.00% - - 64.08% - - 3.92% 69 PR-10 11.73% 16.59% - 10.36% 58.01% - 3.31% 77 PR-11 - 10.65% - - 82.25% - 7.10% 80 PR-12 1.62% 3.30% - - 83.46% - 11.62% 81 PR-13 3.53% 29.75% - 15.48% 44.98% - 6.26% 78 PR-14 - 89.64% - - 10.12% - 0.24% 79 PR-15 15.84% 8.26% - 2.38% 56.47% - 17.05% 80 PR-16 9.66% 37.09% - 14.09% 37.39% - 1.77% 77 PR-17 - 83.67% - - 16.33% - - 79 PR-18 - 3.26% - - 80.55% - 16.19% 82 PR-19 36.97% 46.64% - - - - 16.39% 78 PR-20 - - - 22.77% 72.25% - 4.98% 78 PR-21 93.07% 6.93% - - - - - 69 PR-22 12.11% 16.48% - 44.20% 22.12% - 5.09% 78 PR-23 - - - 90.84% - - 9.16% 71 PR-24 29.68% - - 52.73% - - 17.59% 74 PR-25 33.77% - - 66.23% - - - 68 PR-26 14.23% - - 51.88% - - 33.89% 78 PR-27 77.53% - - 22.47% - - - 69 PR-28 20.19% 2.47% - 30.69% 41.08% - 4.57% 74 PR-29 - - - 92.80% - - 7.20% 70 PR-30 62.87% - - - - - 37.13% 80 PR-31 100.00% - - - - - - 69 PR-32 - - - 88.33% - 11.67% 72 Table 6, below, shows a summary of the unrouted flows for the existing basins. Sheet flow lengths were set to a maximum 300 feet. Refer to the appendices for complete calculations. 10 | P a g e Table 6 Proposed Basin Characteristics BASIN AREA, ACRES TC (MIN) CN Q25-YEAR,CFS Q100- YEAR,CFS PR-7 147.8979 35.13 74 30.86 55.78 PR-8 15.3515 22.40 78 5.18 8.33 PR-9 4.9026 18.44 69 0.61 1.36 PR-10 6.4666 18.49 77 2.60 4.11 PR-11 14.3498 22.71 80 6.49 9.77 PR-12 4.7929 6.00 81 4.35 6.36 PR-13 14.0915 24.45 78 5.36 8.30 PR-14 25.4796 24.17 79 10.58 16.15 PR-15 21.7402 15.56 80 11.46 17.30 PR-16 17.8558 21.43 77 6.20 9.75 PR-17 6.8281 21.99 79 2.83 4.33 PR-18 2.2161 12.70 82 1.66 2.43 PR-19 4.5103 21.89 78 2.02 3.22 PR-20 5.4734 22.39 78 2.45 3.91 PR-21 1.6356 15.62 69 0.25 0.58 PR-22 11.3726 17.29 78 5.02 7.81 PR-23 9.7614 26.46 71 1.46 3.00 PR-24 2.0850 16.29 74 0.57 1.04 PR-25 13.9490 17.16 68 1.44 3.37 PR-26 1.0478 6.00 78 0.75 1.14 PR-27 12.3697 14.71 69 1.90 4.19 PR-28 16.1193 17.88 74 4.44 8.04 PR-29 5.2776 16.73 70 0.79 1.67 PR-30 1.0133 6.00 80 0.85 1.26 PR-31 1.2525 18.41 69 0.16 0.35 PR-32 0.8678 16.25 72 0.18 0.35 The difference between onsite historic and onsite developed flows were used to determine whether detention would be required on EXOS-8. Grass lined channels and culverts will be utilized to convey the proposed runoff to EXOS-8 along historic drainage paths. VI. RESULTS AND RECOMMENDATIONS The entire property eventually drains to a low lying area in basin EXOS-8 on the Rivendell Distribution property to the west of the subject property. There is an agreement in place with the Rivendell Distribution signed in 2021 that allows for this additional runoff to be collected in this low-lying area for the increased runoff and detention from the property. The lower portions of EX-OS8 have irrigation storage in the middle of the existing sod farm operations. This area is capable of passing the 100-yr existing and proposed flow without any impacts to agricultural operations or existing structures. The existing combined runoff to the ponds in EXOS-8 is 303.65 cfs for the 25-yr storm and 11 | P a g e 520.17 cfs for the 100-yr storm. The proposed runoff to the pond in EX0S-8 is 340.26 cfs for the 25-yr storm and 570.08 cfs for the 100-yr storm. The calculations of the curve numbers for each individual proposed basin were also reevaluated in order to coincide with the most current street and lot layout in this amendment to the preliminary plan. The proposed onsite basins within the subdivision peak earlier than the existing onsite basins. The sod farm portion of the Rivendell Distribution property is the only area where most of the onsite proposed basins and the large offsite basins see overlap in the flows. This area is framed on the north by a berm that is located just south of the County Road 119 and to the south by the lowest existing elevation along the shared property boundary with the Colorado Mountain College. Because this area remains undeveloped (other than for sod production) it can be utilized for storm water detention by simply raising the elevation of the berm adjacent to CR 119. Although the 100-year, 24-hour storm calculations do not reflect the need for additional detention from the previous drainage report, the raising the of berm is necessary to provide the needed extra detention capacity from the historic condition. The creation of some additional detention storage will also allow the development to account for some minor storm event models where runoff might see an increase in runoff other than the 100-yr, 24-hour storm event. The total 100-yr, 24-hour storm event detention storage is calculated to be 1,064,197 cubic feet (24.43 acre-ft). This works out to be an additional 0.71’ depth of detention storage above the two low lying pond areas up to elevation of 6899.71’ from the surveyed top of berm south of County Road 119 of 6899.0’. The maximum elevation that the berm could be raised to not store water back into the CMC property is 6900.5’. The proposed change to the berm is to raise the berm across from the piped outfall to County Road 119 up to 6900.5’. A weir calculation shows that in order to pass the 100-yr, 24-hr design storm historic runoff rate of 520.17 cfs a 1.5’ deep and 87’ wide weir would be required. This would place the overflow path at elevation 6699’. The 10’ wide weir would be improved with a surveyor staked 2-foot wide, 6” thick concrete strip in the middle if the weir to confirm that the detention volume is contained within the Rivendell Distribution property. This weir allows for the additional detention volume to drain out of the north pond at the historic design storm rate through the weir. See Exhibit A below showing the weir layout. The concept of increasing the elevation of the berm to create the additional detention storage was reviewed with AVLT and they have provided a letter stating that this improvement is consistent with the terms of the applicant’s original conservation easement. The weir overflows to an area north of the berm within the south side of the fenced existing County Road 119 right-of-way. This road has a 24-inch culvert across from the weir that will address all the smaller storm events. It is currently undersized for the existing 25-yr, 24-hr storm event but the proposed drainage improvements to the Rivendell Distribution property detention pond would only reduce the chances of a major storm event requiring runoff to overtop County Road 119. (i 12 | P a g e EXHIBIT A The minimum culvert size of 18” diameter CMP will be installed except for existing culverts on the west side of County Road 114 and the 36” diameter pipe outfall from the landscape pond east of County Road 114 which is due to the large size of the contribution basins. The culverts throughout the subject property are sized according to the 25-yr 24-hr storm event. The proposed 25-yr 24-hr storm event (62 cfs) from the basins on the east side of CR 114 require a 36” diameter CMP pipe at a slope of 12.66%. The 2016 Preliminary Plan Amendment resolution (Resolution No. 2016-35) Condition #15 states that there should be no further impoundment of water against the improved County Road 114. The original pond storage depth will not be altered by the project improvements. The high water line will be maintained by upsizing the overflow pipe size at the top of pond to pass the increased runoff from the proposed improvements so that there will be no detention above the normal irrigation high water line. The drainage swales along County Road 114 will be 10’ wide and 2’ deep minimum as was 13 | P a g e determined in earlier approvals. The rest of the roads within the subdivision will have a minimum of 6’ wide and 18” deep swale regardless of if the contributing basin would fill the swales to capacity during the 25-yr, 24-hr storm event. VII. CONCLUSIONS The drainage facilities have been designed per Garfield County’s standards and regulations. The proposed storm drainage facilities have been designed to accommodate the runoff from the proposed drainage basins. The proposed storm water flows will be treated and detained prior to discharging to County Road 119 and runoff from the proposed detention facility on the Rivendell Distribution property will be kept at or below historic levels for both the 25-year and 100-year storm events. The lower portions of the Rivendell Distribution property will be revised by raising the berm at the northwest corner of said property in order to provide additional runoff detention storage. The drainage calculations were based upon the above- stated assumptions and are subject to change upon of site design changes at build-out and any modification in the grading caused by individual single-family driveways, swales, and storm sewer piping. VIII. REFERENCES National Oceanic and Atmospheric Administration: Precipitation-Frequency Atlas of the Western United States, Volume III-Colorado. Silver Springs, MD 1973. United States Department of Agriculture, Soil Conservation Service: Soil Map–Aspen- Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties, Web Soil Survey. Soil Conservation Service U.S. Department of Agriculture: Procedures for Determining Peak Flows in Colorado 1984. scale: page: Project No: drawn by: checked by: date: file: HIGH COUNTRY ENGINEERING, INC. 14 INVERNESS DRIVE EAST, STE F-120, ENGLEWOOD, CO 80112 PHONE (303) 925-0544 FAX (303) 925-0547 1517 BLAKE AVENUE, STE 101, GLENWOOD SPRINGS, CO 81601 PHONE (970) 945-8676 FAX (970) 945-2555 www.hceng.com BERKELEY FAMILY PARTNERSHIP GARFIELD COUNTY, CO LAKE SPRINGS PUD VICINITY MAP DRD DRD 11-12-25 J:/CD/VIC MAP 1" = 2000' 2221018 EXHIBIT 1 -i, 1· : II • .,,,, . • ()< " . .,, . . -;; -:--. 1 • BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 2 BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D , C O LA K E S P R I N G S P . U . D . EX I S T I N G D R A I N A G E BA S I N M A P DR D DR D 11 - 2 2 - 2 5 EX D R .,.. .,.. \ \ ~ .,.. .,../.,.. .,.. .,.. .,../ \ \ \ \ \ \ \ \ \ \ \ \ \ \ I GRAPHIC SCALE 0 ,,. JOO 600 I I I I ( IN FEET ) l inch = 300 fL LEGEND ---- -6980 _ ... - 0.00 ACRES CN: 00 Q100: 0.00 CFS NOTES: \ \ I I \ \ \ \ \ \ ------\ --~ \ \ I I \ 1200 '-, I , EXISTING BOUNDARY EXISTING 1 O' CONTOUR DRAINAGE BASIN BOUNDARY DRAINAGE FLOW ARROW BASIN DEUNEA TION ACRES=BASIN SIZE XX-X= BASIN CN= CURVE NAME Q100= 100 :UMBER Q25= 2S ~R RUNOFF (CFS) RUNOFF (CFS) ~ 1. EXISTING INFORMATION PROVIDED BY HIGH COUN TRY ENGINEERING, INC. ------ - 254. 7681 ACRES CN: 72 Q100: 61.99 CFS -- \ I l EXISTING IRRIGATION STORAGE POND t STORAGE p ~ [ :XISTING IRC ------:....------ - _J ,-+--· -- ------- ------- \ \ - CN: 71 Q100: 2.55 CFS CN: 79 Q100: 0.70 CFS CN: 79 QlOO: 5.4-2 CFS CN: 72 QlOO: 1.07 CFS I I I I I ' ,, ,, I ,, BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3 BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S P . U . D . PR O P O S E D D R A I N A G E BA S I N M A P DR D DR D 11 - 2 2 - 2 5 DR A I N I I • J~~-------------=------=::v I) I ,~~~ J ,?JJ ·1 I' I II ))))//jjj)h -f Y~~~~=~F ~~-~~ ~ I I • I\~ I ~!ill_~ ~ ' I ~~~ ~ I 1 \ 1~, ~11,1/At '·-~ ~-~ I 1 \ 1\I\V1[\(\1\\H~~'''-"\ "•, (((IT'(nf,-!f¼tl)j ----• ~\'~~~~\\\'~[(cl~~~~ I / \\ l i) 0) ~"~\'~, ~Wt~lffl --:-:---~~=---~-~ __.ni -~ ~e-"~'.JJ: ~~---~ \ L - - - - - - - - - -.c:: -t, ' C < -~~~~-\~~ ~~:l~ 1' ~---\W~J t ~\~\\\~\\~ I 1 ~ \ \ •. Fl -~li: • ¼' ~~~"¾:: ~--1111 ~~ .~ tr ,"in'i. ~ 1 I ~ f ~ \ ~ ~~\\\\~~~~~~~~-\~ .L {..J' ~---~~"Nlll.J 'I "".Y',.,O!!! ~1\\ ;;f--> I I , ~ '\\t\\\~~~~~~ 1~ ~ v!fj_ I~ '- I _ ~ ~ / , \_\~\ \~{~ •--=-~~ ~~ ~,,..~.,,-~ .. ,..,~~~ ~~~ ~ 2=~1 I -----------'--'----"----J ~ \\\\~ ~ ~)~~~ , j """"""·' ,,,6---. 'b.---= \\ t ~ J/~ ~~Ii\( c_~ ~1/ 1i \ -----EXISTING BOUNDARY ~ ~ )) ~~~~ ~ ;:_;;-'~_/', i) ~~@-_£~ ~ - --'"~-- - • EXISTING MAJOR CONTOUR PROPOSED MAJOR CONTOUR PROPOSED LOT LINE , __ ,, ~ ~ -...-_ ~-= 0, , ) " __ , --" / /, ~ \\\ \\~'-=---:._ -"\\ ~~~ --=-~.,:/,/1/'// DRAINAGE BASIN BOUNDARY =--' \ // ,;; ,'-i ) , '-,.__"':-.._~ -I'.,\ ~ -~ ---1/ ..-::l 1/ {)' -+ DRAINAGE FLOW ARROW -- --------- -------- GRAPHIC SCALE 300 o 150 JOO 600 1200 ---1 .. 1~1 ••• 1---1 ( IN FEET } '-1 inch = 300 ft. '--i r--------~ - - - - - -- BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3A BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S P . U . D . PR O P O S E D D R A I N A G E BA S I N M A P DR D DR D 11 - 2 2 - 2 5 DR A I N DR D EMBANKMENT "THAT FORMS "THE NORTI-i BOUNDARY OF "THE IRRIGATION STORAGE P,OND TO BE INCREASE IN HEIGHT FROM 6899 TO 6900.5' IN ORDER TO INSTALL A A 1.5' DEEP, 99' LONG WEIR (RAISE "THE OUTSIDE OF "THE WEIR ALONG "THE NON-JURISDICTIONAL DAM TO 1'1111-i A NEW OVERFLOW ELEVATION OF 6899.00' TO PROVIDE ADDITIONAL ONSITE DETENTION) EXISTING IRRIGATION~ STORAGE AREA 1-------~~ 99 FOOT WEIR WIDTI-i --------------"j TOP OF WEIR ELEVATION: 6900.50' i-----,,7 FOOT BOTTOf.l 1'11Dl-----i 18" DEPTI-i OF WATER FOR EXISTING 100 YR FLOW TIE TO EXISTING ROAD OVERFLOW BASE WEIR ELEVATION: 6899.00' 6" "THICK CONCRETE PAD TIE TO EXISTING ROAD I 4: 1 SLOPE OF WEIR 4:1 SLOPE OF WEIR PROPOSED POND OVERFLOW WEIR DETAIL NTS LEGEND - --6 9B0- - - -------... - 0.00 ACRES EXISTING BOUNDARY EXISTING EASEMENT EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR PROPSED MAJOR CONTOUR PROPOSED MINOR CONTOUR DRAINAGE BASIN BOUNDARY DRAINAGE FLOW ARROW BASIN DELINEATION ACRES=BASIN SIZE XX-X= BASIN NAME CN= CURVE NUMBER EXISTING SOD FARM 254. 7681 ACRES 2 QLOO: 61.99 CFS CN: 7 . GRAPHIC SCALE 200 400 ,oo o .. 1 , .. 1 __ 1 __ ~~~~~I ~r-1-~-- ( m FEET ) 1 inch = 100 ft. AINTAIN HISTORIC 8" AND 10" IAI.ETER PIPES ACROSS BERM OR MINOR STORM EVENT RELEASE ADDITIONAL DETENTION STORAGE AREA UP TO __ ELEVATION 6900.71' FOR -~ -' INCREASED 1 OOYR, 24HR RUNOFF CN: OO QLOO: 0.00 CFS Q100= 100 YEAR RUNOFF (CFS) Q25• 25 YEAR RUNOFF (CFS) -■■ NOTES: 1. EXISTING INFORMATION PROVIDED BY HIGH COUNTRY ENGINEERING, INC. KEY MAP r. 2000' BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3B BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S P . U . D . PR O P O S E D D R A I N A G E BA S I N M A P DR D DR D 11 - 1 2 - 2 5 DR A I N GRAPHIC SCALE 'i ~ 1 .. i~T --~i ~~~i ( IN FEET ) 1 Inch = 100 ft. I KEY MAP LEGEND - - -6980 - - - -------... - 0.00 ACRES CN: OO QlOO: 0.00 CFS NOTES: EXISllNG BOUNDARY EXISTING EASEMENT EXISTING MAJOR CONTOUR EXISllNG MINOR CONTOUR PROPSED MAJOR CONTOUR PROPOSED MINOR CONTOUR DRAINAGE BASIN BOUNDARY DRAINAGE FLOW ARROW BASIN DELINEATION ACRES=BASIN SIZE XX-X= BASIN NAME CN= CURVE NUMBER Q100= 100 YEAR RUNOFF (CFS) Q25= 25 YEAR RUNOFF (CFS) 1. 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'. ~ • I ' \ ·>~ ~ • ~~'4A \ \\ \~ \ \ \ \\ \ \ \ \~~ \~,~\ \\\ \ ~ \((// / \ I / / / / ,·/,r,, /¾.½1½~ j{f BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3C BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S P . U . D . 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EXISTING INFORt.lATION PROVIDED BY HIGH COUNTRY ENGINEERING, INC. GRAPHIC SCALE 100 0 50 100 200 -400 I .,;• I I 1---1 ( IN FEET ) 1 inch = 100 ft. I BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3D BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S P . U . D . 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OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3E BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S P . U . D . 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LEGEND - - -6980 - - - -------... NOTES: EXISTING BOUNDARY EXISTING EASEMENT EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR PROPSED MAJOR CONTOUR PROPOSED MINOR CONTOUR DRAINAGE BASIN BOUNDARY DRAINAGE FLOW ARROW BASIN DELINEATION ACRES=BASIN SIZE XX-X= BASIN NAME CN= CURVE NUMBER Q100= 100 '!'EAR RUNOFF (CFS) Q25-25 '!'EAR RUNOFF (CFS) 1. EXISTING INFORMATION PR0"1DED BY HIGH COUNTRY ENGINEERING, INC. I I \ ~~l1t1ill\ \ ~ \ \ \ l l 1"-¾-j ! I~~~?::~ x \ JI\\\ \\\\\111111111/li( ( (\I (I /f 1~! 7?! I illf l,I J/1. r, ~ n; -~ 2 ~ =-__ ~~~~ l~//2 ~\\$\\~\\~""~~~ ~~ ~ ~ ~ ~ /--=.ii. ) J l I l1j\\\\\\\~I~\\ JjJ. I .1, \ \ , '-~. "::.;-::;-~ _ j1 t\,~~~~'t,;,;_~~ --;:: ~)))))J/1~11/i\! 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" .~ J t=, ~ ( 1 i 1 / I I r f 'fa I "k ./ ~/ / / ;;;=:, ;~~) J_I 11 ll l,1:1:;1:11:1:11:::111:11_1:11!!! ! 11111 1 11 M 1111 /f( 11~_ ~ . 1 \ 1l \J r \~~A . ~ I \ I 7 ;',(/; 1 / / / /' i ~~', :;~ /~\ \\~tt~~~\\\\ ~~\~\_\_\_~ \ '-----~, ~ -, , ._ ~ \ \ ,/ BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3F BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S P . U . D . PR O P O S E D D R A I N A G E BA S I N M A P DR D DR D 11 - 2 2 - 2 5 DR A I N - -6980 - --. ... LEGEND STING BOUNDARY EXI SEMENT -- -EXISTING EA OR CONTOUR EXISTING MAJOR CONTOUR EXISTING MIN R CONTOUR PROPSED MAJO CONTOUR PROPOSED B~~l~R BOUNDARY DRAINAGE OW ARROW DRAINAGE Fl LINEATION BASIN _?~ASIN SIZE ACRE:_-BASIN NAME i-------:-~;-;, RES_ 2~:xcuRVE =B~~NOFF (cFS) 0.00 ACRES CFS Q100= 100 AR RUNOFF (CFS) Q100: 0.00 Q25= 25 YE_---=:-I aoo ' c ~==~:::-:~GH (::OUNTRYY EENNCGINEERING, IN . NOTES: NG INFORMATION l. EXISTI HIGH COUNTR PROVIDED BY ■■ CN: 72 EXIS"TING HIGH GROUND 0 ,ooiiil 1 -•- \ CN: 77 GRAPHIC SCALE i T i ( IN FEET ) h _ 100 ft. 1 inc - EXISTING HIGH GROUND i ■ ■ KEY r -2000' BY NO . DA T E BY PROJECT NO. OR 5 3 4 - 0 6 7 0 0 I N M E T R O D E N V E R UN D E R G R O U N D M E M B E R U T I L I T I E S EX C A V A T E F O R T H E M A R K I N G O F BE F O R E Y O U D I G , G R A D E , O R CA L L 2 - B U S I N E S S D A Y S I N A D V A N C E 1- 8 0 0 - 9 2 2 - 1 9 8 7 CE N T E R O F C O L O R A D O CA L L U T I L I T Y N O T I F I C A T I O N RE V I S I O N HI G H C O U N T R Y E N G I N E E R I N G , I N C . PH O N E ( 9 7 0 ) 9 4 5 - 8 6 7 6 - F A X ( 9 7 0 ) 9 4 5 - 2 5 5 5 ww w . h c e n g . c o m dr a w n b y : ch e c k e d b y : da t e : fi l e : 15 1 7 B L A K E A V E N U E , S T E 1 0 1 , GL E N W O O D S P R I N G S , C O 8 1 6 0 1 2041025 3G BE R K E L E Y F A M I L Y P A R T N E R S H I P GA R F I E L D , C O LA K E S P R I N G S P . U . D . OF F S I T E B A S I N M A P DR D DR D 11 - 2 2 - 2 5 OF F S I T E B A S I N S DR D GRAPHIC SCALE 1000 0 500 1000 2000 4000 1-•-1 I_I I I ( IN FEET ) 1 Inch = 1000 ft. ILEGENDI EXISTING BOUNDARY - - - - OFFSITE DRAINAGE BASIN BOUNDARY > > > OFFSITE DRAINAGE FLOW LINE BASIN DELINEATION AA""A ACRES=BASIN SIZE 0.00 ACRES XX-X= BASIN NAME CH. OO I Ql00: 0.00 CFS CN= CURVE NUMBER • Q25: o.oo crs Q100= 100 YEAR RUNOFF ( CFS) Q25= 25 YEAR RUNOFF (CFS) 7.1042 ACRES CH: 71 Ql00: 2.56 CFS 0.7866 ACRES CN: 79 Ql00: 0.70 CFS PROJECT NO. 2221018 4 LA K E S P R I N G S P U D GA R F I E L D C O U N T Y , C O L O R A D O LA K E S P R I N G S A M M E N D E D P U D SO I L S C L A S S I F I C A T I O N M A P DR D DR D 11 - 1 2 - 2 5 SC S 2 II GRAPHIC SCA LE 250 500 1000 2000 ( IN FEET ) 1 inch = 500 ft. SOIL TYPE 34: 35: 43: 69: 87: 94: 95= EMPEDRADO LOAM (2-6% SLOPES, DEEP, WELL DRAINED, MODERATE EMPEDRADO LOAM (6-12% SLOPES, DEEP, WELL DRAINED, MODERATE FOAELLE-BROWNSTO COMPLEX (6-12% SLOPES, DEEP, WELL DRAINED, KILGORE SILT LOAM (ALLUVIAL FANS, SLOW RUNOFF, MODERATE PERM MORVAL -TFIIDELL COMPLEX (12-50% SLOPES, DEEP, WELL DRAINED, SHOWALTER-MORAVAL COMPLEX (5-15% SLOPES, DEEP, WELL DRAINED, SF-IOWALTER-MORAVAL COMPLErX (15-25% SLOPES, deEP, WELL DRAINED, 43 • BO U EABIUTY= SOIL TYPE B) MEABILITY= SOIL TYPE B) DERA TE PERMEABILITY= SOIL LITY= SOIL TYPE D) D. RAPID PERM.= SOIL TYPE B~ OW-MOD. PERM.: SOIL TYPE C) OW-MOD. PERM.= SOIL TYPE G z 0 iii ~ 0: w ~ 0 () z ii I ~ ~ NOAA ATLAS 2, Volume Ill Prepared by U.S . Department of Com~rce National Oceanic and Atmospheric Adm inis1rat1on National Wea1her Service, Office of Hydrology Prepared for U.S . Department of Agriculture, Soil Cons<lrvetion Service, Engineering Division Figure 26 ISOPLUVIALS OF 2-YR 24-HR PRECIPITATION IN TENTHS OF AN INCH • HIGH couNTRv ENGINEERING iNc IRKELEYFAMILYPARTNERSHIP DRAWNAr~ ' • GARFIELD COUNTY, CO CHECKED BY: PROJECT No: 14 INVERNESS DRIVE EAST, STE F·l 20, ENGLEWOOD, CO 80 I 12 ALG 2041 025.00 PHONE (303) 925-0544 FAX (303)925-0547 t------------------t 1517BLAKEAVENUE,STEIOl ,GLENWOOD5PRING5,C08160I LAKESPRINGSPUD DATE : 2 _2 6-lO PAGE : EX HIBIT 5 PHONE (970) =~~:N~~~70)945-2555 NOAA MAP, 2YR t----------------------t FILE : J :/SDSKPR0J/204/ 1025/DWG/NOAA-2YR.DWG SCALE: 1" =40,000' ti, I NOAA ATLAS Z Volume Ill Prepared by U.S. Departm nt of Comme~e National Oceanic and Atmospheric Admin istration National Weather Service, Office of Hydrology Prepa~ for U.S. Department of Agriculture, Soil Conservation Servk:e, Engineering Division Fig ure 29 ISOPLUVIALS OF 25-YR 24-HR PREC IPITATION IN TENTHS OF AN INCH • HIGH couNTRv ENGINEERING, 1Nc.,RK~~;1~~~1~6~~~~~~SHIP DRAWNAr~ CHECKED BY: PROJECT No: 14 INVERNESS DRIVE EAST, STE F ·l 20, ENGLEWOOD, CO 80112 ALG 204 1 025.00 PHONE (303) 925-0544 FAX (303) 925-0547 l-0-A---TE-: -----P::-:A,-::G---E: ______ ---t 15l7BLAKEAVENUE,STE IOl ,GLENWOOD5PRING5,C08160I LAKE SPRINGS PUC 2 _2 6-lO EXHIBIT6 PHONE (970) =~~:N~~~70)945-2555 NOAA MAP, 25 YR 1-F-JL""E: _____________ ---t J './SDSKPROJ/204/ 1025/DWG/NOAA·25YR.DWG SCALE: 1" =40,000' Prep red by U.S. ~partment of Commerce Na1ional Oceanic and Atmospheric Admlnlstratk> National 1eether Service, Office of Hydrology Prepared for U.S. Department of Agnculture, Soil Conservation Servle&, Engln erlng Division Figure 31 ISOPLUV1ALS OF 100-YR 24-HR PRECIPITATIOI IN TENTHS OF AN INCH • HIGH couNTRv ENGINEERING iNc IRKELEYFAMILYPARTNERSHIP DRAWNAr~ ' • GARFIELD COUNTY, CO CHECKED BY: PROJECT No: 14 INVERNESS DRIVE EAST, STE F·l 20, ENGLEWOOD, CO 80 I 12 SPG 2041 025.00 PHONE (303) 925-0544 FAX (303)925-0547 t------------------t 1517BLAKEAVENUE,STEIOl ,GLENWOOD5PRING5,C08160I LAKESPRINGSPUD DATE : 2 _2 6-lO PAGE : EXHIBIT 7 PHONE (970) =~~:N~~~70)945-2555 NOAA MAP 100 YR t----------------------t FILE : J './SDSKPROJ/204/ 1 025/DWG/NOAA· 1 OOYR.DWG SCALE: 1" =40,000' Dear, Colorado Mountain College Berkeley Family Partnership in Glenwood Springs -Central Services 802 Grand Avenue, Glenwood Springs, Colorado 81601 P 970.945.8691 P 800.621.8559 F 970.947.8324 February 8, 2012 The facilities department of the Colorado Mountain College has reviewed the proposed preliminary drainage plan impacts of the Lake Springs Ranch Subdivision to the Spring Valley Campus. The College understands that a drainage path of approximately 1500 feet from the outfall of the existing onsite irrigation pond for Lake Springs Ranch will see an increase in runoff during the 100-yr storm event of approximately 13 .2 percent at the completion of all the proposed phases of the subdivision. This is the historic path for a majority of the runoff from the existing ranch property. The proposed detention pond on the Lake Springs Ranch Subdivision property north of the CMC property will receive this proposed runoff. The limits of the pond storage will be restricted to the Lake Springs Ranch Subdivision property and will not extend back onto the CMC property. With these conditions in place, CMC has no objection to Lake Springs Ranch routing this increase in drainage across the north end of the CMC property as described in the plans. Best Regards: ~-) ., 11"\ . t~/t, V r-.. ef-? -- Peter Waller Facilities Director Colorado Mountain College 802 Grand Ave. Glenwood Springs, CO 81601 (970) 947-8406 pwaller@coloradomtn.edu c..r...e .. a Li n g . b .eJ t e . ..r ... J u t u r.e. s .............. .. www.coloradomtn.edu HYDROLOGIC COMPUTATIONS EX-0Sl-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-0Sl-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-OSl, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............ .. Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 2276.8654 ac 816.0000 min 232.4300 cfs -------------------------------------------------------------------------------subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-OSl 2276.8654 75 113.2184 0.0000 2.0000 support Data: subarea Name: EX-OSl, Row: 1 sheet Flow Description .. . .. .. .. . . .. . . . . . . .. sheet Manning's n .. . .. .. . . . . .. .. . . .. . . 0.1300 Flow Length .. ,.... .. . .... .... ... 300.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope...................... 0.1333 ft/ft computed sheet flow time ....................... > 16.0908 min Messages: Info: Time of concentration rounded to 120.0000 min in row <1>. shallow concentrated Flow 'oescription . .. .. . . . . . . . .. . . . .. . . shallow Surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Fl OW Length . . . . . . . . . . . . .. .. . .. . . 2 7007. 0000 ft watercourse slope . . . . . . . . . . . . . . . 0.0825 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 4.6343 fps computed shallow flow time ..................... > 97.1276 min Messages: Info: Time of concentration rounded to 120.0000 min in row <1>. *************************** Total Time of Concentration ......................... >· 113.2184 min **************************** Page 1 EX-OSl-100YR.tXt LAKE SPRINGS RANCH 3/1/15 EX-OSl-lOOYR TR-55 Tabular Hydrograph Input summary Desc ri pti on .................... . EX-OSl, 100 YR Rain fa 11 Di stri buti on .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 2276.8654 ac 816.0000 min 395.6664 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-OSl 2276.8654 75 113.2184 0,0000 2.4000 support Data: subarea Name: Ex-osl, Row: 1 sheet Flow Description . . . . . . . . . . . . . . . . . . . . . sheet Manning's n .. .. .. .. .. . .. . .. .. .. . 0.1300 Flow Length .. .. . .. . .. .. .. . . .. .. . 300.0000 ft TWO Yr, 24 hr Rai nfal 1 .. . .. . .. .. 1. 2000 in Land slope . . . . . . . . . . . . . . . . . . . . . . O .1333 ft/ft computed sheet fl ow ti me ....................... > 16. 0908 min Messages: Info: Time of concentration rounded to 120.0000 min in row <1>. shallow concentrated Flow Description . . . . . . . . . . . . . . . . . . . . . shallow Surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 27007.0000 ft watercourse slope . . . . . . . . . . . . . . . 0.0825 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 4.6343 fps computed sha 11 ow fl ow ti me ..................... > 97 .1276 min Messages: Info: Time of Concentration rounded to 120.0000 min in row <1>. *************************** Total Time of concentration ......................... > 113.2184 min **************************** Page 1 EX-OS4-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-OS4-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-OS4, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 0.7866 ac 732.0000 min 0.4589 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-OS4 0.7866 79 11.4346 0.0000 2.0000 support Data: subarea Name: EX-OS4, Row: 1 sheet Flow Description ..................... Sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Flow Length ..................... 198.0000 ft TWO Yr, 24 hr Rainfall . .. . . . . . . . 1.2000 in Land slope . . . . . . . . . . . .. . . . . . . . . . 0.1364 ft/ft computed sheet flow time ....................... > 11.4346 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 11.4346 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 EX-OS4-100YR.txt LAKE SPRINGS RANCH 3/1/15 EX-OS4-100YR TR-55 Tabular Hydrograph Input summary Description ................. , .. . EX-OS4, 100 YR Ra i nfa 11 Di st ri bution .......... . Ia/P Interpolation ............. . Total Area ............... , .. , .. . Peak Time ...................... . Peak Flow ..................... .. Given Input Data: Method Type II on 0.7866 ac 732.0000 min 0.6989 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-OS4 0.7866 79 11.4346 0.0000 2.4000 support Data: subarea Name: EX-OS4, Row: 1 sheet Flow Description ..................... sheet Manning's n . . .. . .. . . . .. . .. .. .. .. 0.1300 Flow Length ....... .. . . . . . . ... . .. 198.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope . . .. . .. . .. .. . .. .. .. .. . 0.1364 ft/ft computed sheet flow time ....................... > 11.4346 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>, *************************** Total Time of concentration ......................... > 11.4346 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 EX-OS5-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-OS5-25YR TR-55 Tabular Hydrograph Method Input summary Description .................... . EX-OS5, 25 YR Rainfall Di stri buti on .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 7.1042 ac Peak Time ....................... 738.0000 min Peak Flow .. .. .. .. .. .. .. .. .. .. .. . 1.2532 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-osS 7.1042 71 18.3254 0.0000 2.0000 support Data: subarea Name: EX-OS4, Row: 1 sheet Flow Description . . . .. .. .. . . . . . . . . . .. . sheet Manning's n . .. .. . .. .. .. .. . . . . . . . 0.1300 Flow Length . . . .. ........... .. . .. 300.0000 ft TWO Yr, 24 hr Rainfall ... . . ..... 1.2000 in Land Slope...................... 0.1100 ft/ft computed sheet flow time ....................... > 17.3761 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length .... .. .. . . . . .. ....... 315.0000 ft watercourse slope............... 0.1175 ft/ft velocity .. . .. . . . .. . . ....... ..... 5.5306 fps computea shallow flow time ..................... > 0.9493 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 18.3254 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 EX-OS5-100YR.txt LAKE SPRINGS RANCH 3/1/15 EX-OS5-100YR TR-55 Tabular Hydrograph Method Input summary Description .................... . EX-OS5, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 7.1042 ac Peak Time ....................... 738.0000 min Peak Fl ow . .. . . .. .. . .. . .. .. .. .. .. 2. 5450 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) ------------------------------------------------------------------------------- EX-05.f 7.1042 71 18.3254 0.0000 2.4000 Support Data: subarea Name: EX-OS4, Row: 1 sheet Flow Description ..................... sheet Manning's n . .. .. .. .. . .. . .. .. .. .. 0.1300 Flow Length .. . .. . .. .. .. . .. .. .. .. 300.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope . . .. . .. .. .. .. .. .. .. .. . 0.1100 ft/ft computed sheet fl ow ti me ....................... > 17. 3761 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Fl ow Length . . . . . . . . . . . . . . . . . . . . . 315. 0000 ft Watercourse slope............... 0.1175 ft/ft velocity .. . . .. .. .. .. . .. .. . .. . .. . 5. 5306 fps computecl shallow flow time ..................... > 0.9493 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 18.3254 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 EX-OS6-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-OS6-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-OS6, 25 YR Rai nfa 11 Di stri buti on .......... . Ia/P Interpolation ............ .. Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 152.4295 ac 762.0000 min 37.1887 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-OS6 152.4295 77 45.6076 0.0000 2.0000 support Data: subarea Name: EX-OS6, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. . .. .. .. .. .. .. .. 0.1300 Flow Length ....... ... . . . . . .... .. 300.0000 ft TWO Yr, 24 hr Rainfall .. .. .. .. .. 1. 2000 in Land slope .. . .. . .. .. .. .. .. .. .. .. 0.0833 ft/ft computed sheet fl ow ti me ....................... > 19. 4201 min Messages: ,Info: Time of concentration rounded to 45.0000 min in row <1>. shallow concentrated Flow Description .. .. .. .. .. .. .. .. .. .. . shallow suf'face ......................... unpaved Flow Length . .. . .. .. .. .. .. .. .. .. . 1980.0000 ft watercourse slope . . .. . . ....... .. 0.0061 ft/ft velocity........................ 1.2601 fps computed shallow flow time ..................... > 26.1875 min Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. *************************** Total Time of concentration ......................... > 45.6076 min **************************** Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. Page 1 EX-OS6-100YR.txt LAKE SPRINGS RANCH 3/1/15 EX-OS6-100YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-OS6, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 152.4295 ac 762.0000 min 58.7884 cfs subarea D/S subareas Area CN Tc Tt Rainfall oescri pt ion (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-OS6 152.4295 77 45,6076 0.0000 2.4000 support oata: subarea Name: EX-OS6, Row: 1 sheet Flow Description ..................... sheet Manning's n ..................... 0.1300 Flow Length .. .. .. .. .. .. .. .. .. .. . 300.0000 ft TWO vri 24 hr Rainfall . . . . . . . . . . 1.2000 in Lands ope...................... 0.0833 ft/ft computed sheet flow time ....................... > 19.4201 min Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface ......................... unpaved Flow Length ..................... 1980.0000 ft watercourse slope............... 0.0061 ft/ft velocity........................ 1.2601 fps computei:1 shallow flow time ..................... > 26.1875 min Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. *************************** Total Time of concentration ......................... > 45.6076 min **************************** Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. Page 1 Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 EX0S-7 -25YR Hydrograph type Storm frequency (yrs) Drainage area (ac) Basin Slope (%) Tc method Total precip. (in) Storm duration (hrs) Q (cfs) 40.00 30.00 20.00 10.00 ··.· .... ... = scs = 25 = 159.240 = n/a = User = 2.00 = 24 · .. Peak discharge (cfs) = 37.88 Time interval (min) = 1 Curve number (CN) = 75 Hydraulic length (ft) = n/a Time of cone. (min) = 35 Storm Distribution = Type II Shape factor = 484 Hydrograph Volume= 220,202 (cuft); 5.055 (acft) Runoff Hydrograph 25-yr frequency ... ... .... ... .... \ ..... ~ ,.,___ .. . ... ' . , ... ·· . ... ... . •. .. . ... .·· . Q (cfs) 40.00 30.00 20.00 10.00 '-0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 37.88 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 EX0S-7-1 00YR Hydrograph type Storm frequency (yrs) Drainage area (ac) Basin Slope (%) Tc method Total precip. (in) Storm duration (hrs) = SGS = 100 = 159.240 = n/a = User = 2.40 = 24 Peak discharge (cfs) Time interval (min} Curve number (CN) Hydraulic length (ft) Time of cone. (min) Storm Distribution Shape factor = 66.30 = 1 = 75 = nla = 35 = Type II = 484 Hydrograph Volume= 342,768 (curt); 7.869 (acft) Runoff Hydrograph Q (cfs) 100-yr frequency Q (cfs) 70.00 -,-------.----,,--..------r-----r---.-----~----r----r--.------,-------r------.-70.00 60.00 -1----+----+--+----+----+---liH--+---+----+--+----+----+-----+ 60.00 50.00 --1-----1----+--+----t---1-----ia-t---t------+---+---+------t----1----+-50.00 40.00 --1-----1----+--+----+-----+-----11--+---+------+---+---+-----+----I----+-40.00 ····· ••. 30.00 -i-------t------t---+----t-----1------1i----.---t----t------t----t------t-----t------t-30.00 20.00 ---------------1------1>----11,-----t---t------+--+-----f------+-20.00 ,, •• 10.00 --1-----1----+---1---t-----t----llll------t---t-----+---+-----t------+-10.00 • .. ?~r~··•·._· .... .,.. .. ---~-4-..~· X 0.00 ______________ __,1---_ _._ _ _,__ .............. __ .___ _ _.__ _ __._ ___ __._ 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 66.30 (cfs) LAKE SPRINGS 3/1/15 ~-25YR t,:-,<-cwe RANCH ~-25YR.txt Cx-o; 6 TR-55 Tabular Hydrograph Method Input summary Description .................... . EX-1, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............ .. Total Area ..................... . Type II On 254. 7681 ac Peak Time ....................... 762.0000 min Peak Flow . . . . . . . . . . . . . . . . . . . . . . . 31.0772 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-1 254.7681 72 44.7059 0.0000 2.0000 support Data: subarea Name: EX-1, Row: 1 sheet Flpw Description ..................... sheet Manning's n ... .. .. . . . . ... ....... 0.1300 Fl ow Length . . . . . . . . . . . . . . . . . . . . . 300. 0000 ft TWO Yr, 24 hr Rainfall . . ........ 1.2000 in Land slope...................... 0.1000 ft/ft computed sheet flow time ....................... > 18.0514 min Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. shallow concentrated Flow Description ..................... Shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length .. .. .. .. .. .. .. .. .. .. . 5600.0000 ft Watercourse slope............... 0.0471 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 3.5016 fps computed shallow flow time ..................... > 26.6545 min Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. *************************** Total Ti me of concentration ......................... > 44. 7059 min **************************** Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. Page 1 £:'!X o~-8 ~-100YR.txt LAKE SPRINGS 3/1/15 ~-lOOYR t;..:~s-e RANCH TR-55 Tabular Hydrograph Input summary Description .................... . EX-1 100 YR Rainfali Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peal< Flow ...................... . Given Input Data: Method Type II on 254. 7681 ac 762.0000 min 61. 9851 cfs subarea D/S subareas Area (ac) CN TC (min) Tt Rainfall Description (min) (in) Ex-osB 254.7681 72 44.7059 0.0000 2 .4000 support Data: subarea Name: EX-1, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Flow Length ..................... 300.0000 ft Two vr1 24 hr Rainfall . ......... 1.2000 in Lands ope...................... 0.1000 ft/ft computed sheet flow time ....................... > 18.0514 min Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Fl OW Length . . . . . . . . . . . . . . . . . . . . . 5600. 0000 ft watercourse slope............... 0.0471 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 3. 5016 fps computecl shallow flow time ..................... > 26.6545 min Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. *************************** Total Time of concentration ......................... > 44. 7059 min **************************** Messages: Info: Time of concentration rounded to 45.0000 min in row <1>. Page 1 EX-2-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-2-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-2, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ..................... .. Given Input Data: Method Type II on 5.9181 ac 738.0000 min 0.7395 cfs subarea D/S subareas Area CN Tc Tt Rainfall oescri pt ion (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-2 5.9181 69 15.1560 0.0000 2.0000 support Data: subarea Name: EX-2, Row: 1 Sheet Flow Description ..................... sheet Manning's n . .. .. .. .. .. .. .. .. .. .. 0.1300 Flow Length ..................... 265.0000 ft TWo Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope .. . .. . .. . .. .. .. .. . .. .. 0.1208 ft/ft computed sheet flow time ....................... > 15.1560 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 15.1560 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 EX-2-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 EX-2-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . EX-2 100 YR Rainfali Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II On 5.9181 ac 738.0000 min 1.6404 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-2 5.9181 69 15,1560 0.0000 2.4000 support Data: subarea Name: EX-2, Row: 1 sheet Flow Description ..................... sheet Manning's n . .. . .. .. .. .. .. .. . .. .. 0.1300 Fl ow Length .. . .. .. .. . .. .. . .. . .. . 265. 0000 ft TWO Yr, 24 hr Rainfall ....... , . . 1.2000 in Land slope .. .. .. .. .. . .. .. .. .. .. . 0.1208 ft/ft computed sheet flow time ....................... > 15.1560 min Messages: Info: Time of concentration rounded to 18.0000 min in row <l>. *************************** Total Time of concentration ......................... > 15.1560 min tr idr -tr -tr -fr -It -fr fr* -ltir -Ir fr fr**** it -lr 1t -/ridr 'f('{t 'fr Messages: Info: Time of concentration rounded to 18.0000 min in row <l>. Page 1 EX-3-25YR.tXt LAKE SPRINGS RANCH 3/1/15 EX-3-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-3 25 YR Rainfal1 Distribution ......... .. Ia/P Interpol at ion ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 10.9278 ac 732.0000 min 1. 6799 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-3 10.9278 69 14.1425 0.0000 2.0000 support Data: subarea Name: EX-3, Row: 1 sheet Flow Description ..................... Sheet Manning's n ..................... 0.1300 Flow Length . . . . .. .. .. .. .. . .. . . . . 300.0000 ft TWO Yr1 24 hr Rainfall . . ........ 1.2000 in Lands ope...................... 0.2467 ft/ft computed sheet flow time ....................... > 12.5789 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. shallow concentrated Flow Description . . . . . . . . . . . . . . . . . . . . . Sha 11 ow surface ......................... Unpaved Flow Length . . .. .. ... ... ......... 530.0000 ft Watercourse slope . . . . . . . . . . . . . . . 0.1226 ft/ft velocity ....... ............ ... .. 5.6494 fps compute □ shallow flow time ..................... > 1. 5636 min Messages: Info: Time of Concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ........................ ,> 14.1425 min **************************** Messages: Info: Time of Concentration rounded to 12.0000 min in row <1>. Page 1 EX-3-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 EX-3-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . EX-3, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area .......... , ....... , .. . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 10.9278 ac 732.0000 min 3.6971 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-3 10.9278 69 14.1425 0.0000 2,4000 support Data: subarea Name: EX-3, Row: 1 sheet Flow Description ..................... sheet Manning's n ..................... 0.1300 Flow Length .. .. .. .. . .. .. .. .. .. .. 300.0000 ft TWO Yr, 24 hr Rainfall . ... . . .. .. 1.2000 in Land Slope...................... 0.2467 ft/ft computed sheet fl ow time ....................... > 12. 5789 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. shallow concentrated Flow Description .. .. .. .. . .. .. .. . .. . . . shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Flow Length ..................... 530.0000 ft watercourse slope............... 0.1226 ft/ft velocity . .. .. . .. .. .. .. . .. .. .. .. . 5.6494 fps computed shallow flow time ..................... > 1.5636 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 14.1425 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 EX-4-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-4-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-4 25 YR Rainfali Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 18.7643 ac 732.0000 min 2.8847 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-4 18.7643 69 14.5398 0.0000 2.0000 support Data: subarea Name: EX-4, Row: 1 sheet Flow Description ..................... Sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Flow Length . ......... .. ... .... .. 300.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope . . . . . . . . . . . . . . . . . . . . . . O. 2533 ft/ft computed sheet fl ow ti me ....................... > 12. 4468 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. shallow concentrated Flow Description . . . . . . . . . . . . . . . . . . . . . shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 660.0000 ft Watercourse slope . . . . . . . . . . . . . . . 0.1061 ft/ft velocity .. . . . .. .. . . . . . . .. . . .. .. . 5.2555 fps computed shallow flow time ..................... > 2.0930 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 14.5398 min **************************** Messages: Info: Time of Concentration rounded to 12.0000 min in row <1>. Page 1 EX-4-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 EX-4-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . EX-4 100 YR Rai nfal i Di stri but ion .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 18.7643 ac 732.0000 min 6.3484 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-4 18.7643 69 14.5398 0.0000 2.4000 support Data: subarea Name: EX-4, Row: 1 Sheet Flow Description ..................... sheet Manning's n ..................... 0.1300 Flow Length . . ....... .. .......... 300.0000 ft TWo Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope . . .. . .. . .. .. .. .. . .. . . . 0.2533 ft/ft computed sheet fl ow ti me ....................... > 12. 4468 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. shallow concentrated Flow Description ..................... Shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 660.0000 ft Watercourse slope............... 0.1061 ft/ft velocity .. .. . .. .. .. .. .. .. . .. .. .. 5.2555 fps computed shallow flow time ..................... > 2.0930 min Messages: Info: Time of Concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 14.5398 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 EX-S-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-5-25YR TR-55 Tabular Hydrograph Method Input summary Description .................... . EX-5, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 2.1733 ac Peak Time .. .. .. .. .. .. . .. .. .. .. .. 732.0000 min Peak Flow ....................... 0.5480 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-5 2.1733 72 14.3677 0.0000 2.0000 support Data: subarea Name: EX-5, Row: 1 sheet Flow Description ..................... sheet Manning's n ..................... 0.1300 Flow Length ..................... 266.0000 ft TWO Yri 24 hr Rainfall .......... 1.2000 in Lands ope ...................... 0.1391 ft/ft computed sheet flow time ....................... > 14.3677 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 14.3677 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 EX-5-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 EX-5-100YR TR-55 Tabular Hydrograph Method Input summary Description .................... . EX-5 100 YR Rainfali Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II On 2.1733 ac Peak Time ....................... 732.0000 min Peak Fl ow .. .. .. .. .. .. .. .. .. . .. .. 1. 0666 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-5 2.1733 72 14.3677 0.0000 2.4000 support Data: subarea Name: EX-5, Row: 1 sheet Flow Description . . . . . . . . . . . . . . . . . . . . . sheet Manning's n .. . .. . .. .. .. .. .. .. .. . 0.1300 Fl ow Length . . . . . . . . . . . . . . . . . . . . . 266. 0000 ft TWO Yri 24 hr Rainfall .......... 1.2000 in Lands ope...................... 0.1391 ft/ft computed sheet flow time ....................... > 14.3677 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 14.3677 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 EX-6-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-6-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-6, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 7.3243 ac 738.0000 min 3.5364 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-6 7.3243 79 18.8685 0.0000 2.0000 support Data: subarea Name: EX-6, Row: 1 sheet Flow Description ..................... sheet Manning's n .. . . .. ............... 0.1300 Flow Length . . . . . . . . . . . . . . . . . . . . . 300.0000 ft TWO Yr, 24 hr Rainfall ·•·•·••··· 1.2000 in Land Slope...................... 0.1133 ft/ft computed sheet fl ow ti me ....................... > 17 .1719 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Shallow Concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length . . . . . . . . . . . . . . . . . . . . . 675 .0000 ft Watercourse slope............... 0.1689 ft/ft Velocity........................ 6.6309 fps computed shallow flow time ..................... > 1.6966 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 18.8685 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 EX-6-100YR.txt LAKE SPRINGS RANCH 3/1/15 EX-6-lOOYR TR-55 Tabular Hydrograph Method Input summary Description .................... . EX-6, 100 YR Rainfall Distribution .......... . ra/P Interpolation ............. . Total Area ..................... . Type II on 7.3243 ac Peak Time ....................... 738.0000 min Peak Fl ow .. .. . . . . . . .. . . . . . . . . . . . 5 .4190 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-6 7.3243 79 18.8685 0.0000 2.4000 support Data: subarea Name: EX-6, Row: 1 sheet Flow Description ..................... sheet Manning's n . . .. . .. .. . . . .. . . . . .. . 0.1300 Flow Length . . ... ........... ..... 300.0000 ft TWO Yri 24 hr Rainfall •••••••·•· 1.2000 in Land s ope . .. . . . . . .. . . .. .. .. . . . . 0.1133 ft/ft computed sheet fl ow ti me ....................... > 17 .1719 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Flow Length . .. . . .. .. . .. .. . .. . .. . 675.0000 ft watercourse slope . . . . . . . . . . . . . . . 0.1689 ft/ft Velocity........................ 6.6309 fps computed Sha 11 ow fl ow ti me ..................... > 1. 6966 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 18.8685 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>, Page 1 EX-7-25YR.txt LAKE SPRINGS RANCH 3/1/15 EX-7-25YR TR-55 Tabular Hydrograph Input summary Description .................... . EX-7 25 YR Rainfali Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 3.4709 ac 738.0000 min 1. 2391 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------EX-7 3.4709 76 16.2839 0.0000 2.0000 support Data: subarea Name: EX-7, Row: 1 sheet Flow Description ..................... Sheet Manning's n .. .. .. .. .. .. .. .. .. .. . 0.1300 Flow Length ......... ,,. . . . . . . . . . . 300. 0000 ft 1Wo Yr, 24 hr Rainfall .......... 1.2000 in Land slope .. .. . .. . .. .. .. .. . .. .. . 0.1567 ft/ft computed sheet flow time ....................... > 15.0828 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Fl OW Length .. .. .. .. .. .. .. .. .. .. . 260. 0000 ft watercourse slope............... 0.0500 ft/ft velocity........................ 3.6078 fps computed Sha 11 ow fl ow ti me ..................... > 1. 2011 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 16.2839 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 EX-7-lOOYR.tXt LAKE SPRINGS RANCH 3/1/15 EX-7-lOOYR TR-55 Tabular Hydrograph Method Input summary Des~~~~~ii3o·vR· •••••••• • • •••••• • Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Type II on 3.4709 ac 738.0000 min 2.0409 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) Ci n) -------------------------------------------------------------------------------EX-7 3.4709 76 16.2839 0.0000 2.4000 support Data: subarea Name: EX-7, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Flow Length ................ .. . .. 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land Slope...................... 0.1567 ft/ft computed sheet flow time ....................... > 15 .0828 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow Concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length . .. .. .. .. .. .. .. .. .. .. 260.0000 ft watercourse slope............... 0.0500 ft/ft velocity . .. .. . . . . . . ... ... . . . . ... 3.6078 fps computea shallow flow time ..................... > 1.2011 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Total Time of concentration ......................... > 16.2839 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 Hydrology Report Hydraflow Express Extension for Autodesk® Civil 30® by Autodesk, Inc. Monday, Nov 24 2025 PR-7-25YR Hydrograph type = SGS Peak discharge (cfs) = 30.86 Storm frequency (yrs) = 25 Time interval (min) = 1 Drainage area (ac) = 147.900 Curve number (CN) = 74 Basin Slope(%) = n/a Hydraulic length (ft) = n/a Tc method = User Time of cone. (min) = 35 Total precip. (in) = 2.00 Storm Distribution = Type II Storm duration (hrs) = 24 Shape factor = 484 Hydrograph Volume= 187,812 (cuft); 4.312 (acft) Runoff Hydrograph Q (cfs) 25-yr frequency Q (cfs) 35.00 ~-~--~-~------~----~-~-~--~-~-~ 35.00 10.00 0.00 ---------------i..-----11-l-----'---'----'-------L--.L.__.-_L_.:s,,__J_ 0.00 0.0 2.0 4.0 6.0 8,0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 30.86 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 30® by Autodesk, Inc. Monday, Nov 24 2025 PR-7-100YR Hydrograph type = scs Peak discharge (cfs) = 55.78 Storm frequency (yrs) = 100 Time interval (min) = 1 Drainage area (ac) = 147.900 Curve number (CN) = 74 Basin Slope(%) = n/a Hydraulic length (ft) = n/a Tc method = User Time of cone. (min) = 35 Total precip. (in) = 2.40 Storm Distribution = Type II Storm duration (hrs) = 24 Shape factor = 484 Hydrograph Volume= 296,814 (cuft); 6.814 (acft) Runoff Hydrograph Q (cfs) 100-yr frequency a (cfs) 60. 00 -,--------,----,---,-----,.---..,...-----r------r---,--------r-----,---~---r----.-60.00 50.00 -+----+---+-------+---+--+------+H--+--+----+-----+----1---+----+-50. 00 40. 00 -+-----+--->-------+-----+---4------+ll--<l------+---+-----+----t---+------<------+--40. 00 30.00 -+-----+---+---+----+--+-----t-1!---+--+----+----+--+-----t---t-30.00 20.00 -+----+---+---+----+--t----11---ll---+--+----t----+---l----t----+-20.00 10.00 --1------1---1-----1-----1----l----ll---· ·-'I\ ...... ·""_·+.· -----1-----1---+-'·_---<e------l-10.00 . \k_ C 1----,----.+---,....,J..........:.,r'\... 0.00 _........._-""' ______ ......., ____ .....__ _ __._ __ ,._, _ __.__ _ __,__ __ .L-_ __.___.,..,,_--L. 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 55.78 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 30® by Autodesk, Inc. Monday, Nov 24 2025 PR-8-25YR Hydrograph type = SGS Peak discharge (cfs) = 5.180 Storm frequency (yrs) = 25 Time interval (min) = 1 Drainage area (ac) = 15.352 Curve number (CN) = 78 Basin Slope(%) = n/a Hydraulic length (ft) = n/a Tc method = User Time of cone. (min) = 35 Total precip. (in) = 2.00 Storm Distribution = Type II Storm duration (hrs) = 24 Shape factor = 484 Hydrograph Volume= 26,994 (cuft); 0.620 (acft) Runoff Hydrograph Q (cfs) 25-yr frequency Q (cfs) 6.00 --r-------.--.-----.-----r---.-----.-----r----r------r----.---~----r----.-6.00 5.00 -+---+--t----+---+--+----Hlt--+--+----+----+--+----+----+-5.00 4.00 --t------t---t----+-------t---t----!Hl-------t---t----+---+--+----+----+-4.00 3.00 -1-------t---t----+----+--+--------------1-----1---+---1-------1-3.00 ............... , ..... ·-···· 2.00 -+---+--t----+---t---t----1--t---+--+----+----+--+---+----+-2.00 \ 1.00 --i--i-----+---+---+--+----.-'\....-.·.· .... -•.• S--.· .. -..•.•.•.. -.•. _-..•. -•....••.• -... -+-··· -. -------1.00 ~-t---4---1--.L'\,. 0.00 ---------------J,u._ _ __,_ __ .,____ _ _.___--1. __ .,___---1,__-.1-0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 5.18 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 PR-8-100YR Hydrograph type Storm frequency (yrs) Drainage area (ac) Basin Slope(%) Tc method Total precip. (in) Storm duration (hrs) Q (cfs) 10.00 8.00 6.00 4.00 2.00 0.00 = SGS = 100 = 15.350 = n/a = User = 2.40 = 24 •· .. Peak discharge (cfs) = 8.327 Time interval (min) = 1 Curve number (CN) = 78 Hydraulic length (ft) = n/a Time of cone. (min) ::::: 35 Storm Distribution = Type II Shape factor = 484 Hydrograph Volume= 40,333 (cuft); 0.926 (acft) Runoff Hydrograph 100-yr frequency .. \ I"--., .J "'- Q (cfs) 10.00 8.00 6.00 4.00 2.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 8.33 (cfs) PR-9-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR-9-25YR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-9 25 YR Rai nfal i Di stri buti on .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 4.9026 ac Peak Time ....................... 738.0000 min Peak Fl ow .. . .. .. .. . .. .. .. .. .. .. . O. 6126 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-9 4.9026 69 18.4443 0.0000 2.0000 support Data: subarea Name: PR-9, Row: 1 sheet Flow Description . .. .. .. .. . .. .. .. .. . .. Sheet Manning's n .. .. .. .. .. .. .. . .. .. .. 0.1300 Flow Length ..................... 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land Slope...................... 0.1133 ft/ft computed sheet flow time ....................... > 17.1719 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface ......................... Unpaved Flow Length . .. . .. .. . .. .. .. . .. .. . 334.0000 ft Watercourse slope............... 0.0973 ft/ft Velocity........................ 5.0328 fps computed shallow flow time ..................... > 1.1061 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channe 1 Fl ow Description ..................... Ditch Flow Area....................... 4.5000 ft2 wetted Peri meter . . . . . . . . . . . . . . . . 80. 4000 in Fl ow Length . . . . . . . . . . . . . . . . . . . . . 140. 0000 ft channel slope................... 0.0464 ft/ft Manning's n .. .. . .. .. .. . .. .. .. .. . 0.0175 Hydraulic radius ................ 8.0597 in velocity........................ 14.0281 fps computei:l channel flow time ..................... > 0.1663 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-9-25YR.txt Total Time of concentration ........................ ,> 18.4443 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <l>, Page 2 PR-9-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR9-100YR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-9, 100 YR Rainfall Di stri buti on .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 4.9026 ac Peak Time ....................... 738.0000 min Peak Flow . . . . . . . . . . . . . . . . . . . . . . . 1. 3590 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-9 4.9026 69 18.4443 0.0000 2.4000 support Data: subarea Name: PR-9, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0 .1300 Flow Length..................... 300.0000 ft TWO Yri 24 hr Rainfall . . . . . . . . . . 1.2000 in Lands ope...................... 0.1133 ft/ft computed sheet flow time ....................... > 17 .1719 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 334.0000 ft watercourse slope............... 0.0973 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 5.0328 fps computed shallow flow time ..................... > 1.1061 min Messages: Info: Time of Concentration rounded to 18.0000 min in row <1>. channel Fl ow Description ..................... Ditch Fl ow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 wetted Perimeter . . . . . . . . . . . . . . . . 80. 4000 in Fl ow Length . . . . . . . . . . . . . . . . . . . . . 140. 0000 ft channel Slope . . . . . . . . . . . . . . . . . . . 0.0464 ft/ft Manning's n ................... .. 0.0175 Hydraulic radius ................ 8.0597 in velocity . . . . . . . . . . . . . . . . . . . . . . . . 14.0281 fps computed channel flow time ..................... > 0.1663 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-9-lO0YR.txt Total Time of concentration ......................... > 18.4443 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-10-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR-10-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-10, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Ti me ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 6.4666 ac 738.0000 min 2.6022 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-10 6.4666 77 18.4878 0.0000 2.0000 support Data: subarea Name: PR-10, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. .. .. .. .. .. .. .. . 0.1300 Flow Length..................... 300.0000 ft Two Yri 24 hr Rainfall .. . .. .. .. . 1.2000 in Lands ope...................... 0.1100 ft/ft computed sheet flow time ....................... > 17.3761 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length..................... 346.0000 ft Watercourse slope .. . .. ..... ..... 0.1214 ft/ft velocity........................ 5.6217 fps Computed shallow flow time ..................... > 1.0258 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channel Flow Description ..................... Ditch Fl ow Area .. .. .. .. .. .. .. .. .. .. .. . 4. 5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length ..................... 50.0000 ft channel Slope................... 0.0222 ft/ft Manning's n .. .. .. . .. .. .. .. .. .. .. 0.0175 Hydraulic radius................ 8.0597 in Velocity ..... .. .. . .......... .... 9.7032 fps Computea channel flow time ..................... > 0.0859 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-10-25YR.txt *************************** Total Time of concentration ......................... > 18.4878 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-10-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR-10-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . PR-10, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 6.4666 ac 738.0000 min 4.1132 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-10 6.4666 77 18.4878 0.0000 2.4000 support Data: subarea Name: PR-10, Row: 1 Sheet Flow Description . .. .. .. .. .. .. . .. . .. .. sheet Manning's n .. .. .. . .. . .. .. .. .. .. . 0.1300 Flow Length .. .. .. .. .. .. .. . .. .. .. 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land Slope...................... 0.1100 ft/ft computed sheet flow time ....................... > 17.3761 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length . . .. .......... ....... 346.0000 ft Watercourse slope............... 0.1214 ft/ft Velocity . . . . . . . . . . . . . . . . . . . . . . . . 5. 6217 fps Computed shallow flow time ..................... > 1.0258 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Channel Fl ow Description ..................... Ditch Flow Area .. .. .. .. .. .. .. . .. .. .. .. 4.5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length ..................... 50.0000 ft channel slope . . . . . . . . . . . . . . . . . . . 0.0222 ft/ft Manning's n . . . . . . . . . . . . . . . . . . . . . 0.0175 Hydraulic radius .. .. .. .. . .. .. .. . 8.0597 in Velocity . . . . . . . . . . . . . . . . . . . . . . . . 9. 7032 fps computed channel flow time ..................... > o. 0859 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-10-lO0YR.txt Total Time of concentration ..... , .......... , .... , .. ,> 18.4878 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <l>. Page 2 PR-ll-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR-ll-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-11, 25 YR Rainfall Distribution ..... , .... . Ia/P Interpolation ............. . Total Area ..................... . Peak Ti me ...................... . Peak Flow ..................... , . Given Input Data: Method Type II on 14. 3498 ac 744.0000 min 6.4921 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-11 14.3498 80 22.7089 0.0000 2.0000 support Data: subarea Name: PR-11, Row: 1 sheet Flow Description ..................... sheet Manning's n . .. . .. .. .. .. .. . .. . .. . 0.1300 Flow Length . . . . . . . . . . . . . . . . . . . . . 300.0000 ft TWO Yr, 24 hr Rainfall ..... .. ... 1.2000 in Land slope...................... 0.0733 ft/ft computed sheet flow time ....................... > 20.4394 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Fl ow Length .. .. .. .. .. .. .. .. .. .. . 502. 0000 ft watercourse slope............... 0.0717 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 4. 3203 fps computecl shallow flow time ..................... > 1.9366 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. channel Flow Description ...... , .............. Ditch Fl ow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 wetted Peri meter . . . . . . . . . . . . . . . . 80. 4000 in Flow Length .. .. . .. .. .. .. .. . .. .. . 150.0000 ft channel slope .. .. .. .. .. .. .. .. .. . 0.0133 ft/ft Manning's n .. . .. .. . .. . .. ... .. .. . 0.0175 Hydraulic radius ................ 8.0597 in Velocity .. .. . .. .. .. . .. . .. .. .. . .. 7.5104 fps computecl channel fl ow ti me ..................... > O. 3329 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-ll-25YR.tXt Total Time of concentration ......................... > 22.7089 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-11-lOOYR.tXt LAKE SPRINGS RANCH 3/1/15 PR-11-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . PR-11, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ..................... .. Given Input Data: Method Type II on 14.3498 ac 738.0000 min 9.7743 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) Ci n) -------------------------------------------------------------------------------PR-11 14.3498 80 22.7089 0.0000 2.4000 support Data: subarea Name: PR-11, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. .. . .. .. .. .. .. .. 0.1300 Flow Length..................... 300.0000 ft TWO Yr, 24 hr Rainfall . ..... .... 1.2000 in Land slope...................... 0.0733 ft/ft computed sheet flow time ....................... > 20.4394 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length..................... 502.0000 ft watercourse slope............... 0.0717 ft/ft Velocity........................ 4.3203 fps computed shallow flow time ..................... > 1.9366 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Channe 1 Fl ow Description ..................... Ditch Flow Area....................... 4.5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length..................... 150.0000 ft channel slope .. .. .. .. .. . .. .. .. .. 0.0133 ft/ft Manning's n .. .. .. .. .. .. .. .. .. .. . 0.0175 Hydraulic radius ................ 8.0597 in velocity . ............. .......... 7.5104 fps computed channel flow time ..................... > 0.3329 min Messages: Info; Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-11-lO0YR.tXt Total Time of concentration ......................... > 22.7089 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-12-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR-12-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-12, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 4.7929 ac 726. 0000 min 4.3472 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-12 4.7929 81 6.0000 0.0000 2.0000 support Data: subarea Name: PR-12, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . O. 1300 Flow Length . . . .. ......... ....... 20.0000 ft TWO vri 24 hr Rainfall .......... 1.2000 in Lands ope...................... 0.3000 ft/ft computed sheet flow time ....................... > 1.3329 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. channel Fl ow Description ..................... Ditch Flow Area .. .. .. .. .. .. . . .. .. . .. .. 4.5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80 .4000 in Flow Length . ............ ........ 1783.0000 ft channel slope . . . . . . . . . . . . . . . . . . . 0.0555 ft/ft Manning's n . .. .. . .. . .. .. .. .. .. .. 0.0175 Hydraulic radius ..... .. ....... .. 8.0597 in Velocity........................ 15.3421 fps computed channel flow time ..................... > 1.9369 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. *************************** Total Time of concentration ......................... > 3.2698 min **************************** Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. Page 1 PR-12-lOOYR.tXt LAKE SPRINGS RANCH 3/1/15 PR-12-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . PR-12, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 4.7929 ac 726.0000 min 6.3634 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-12 4.7929 81 6.0000 0.0000 2.4000 support Data: subarea Name: PR-12, Row: 1 sheet Flow Description . . . . . . . . . . . . . . . . . . . . . Sheet Manning's n .. .. .. .. .. .. .. . .. .. .. 0.1300 Flow Length ..................... 20.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope .. .. .. . .. .. .. .. .. .. .. . 0.3000 ft/ft computed sheet flow time ....................... > 1.3329 min Messages: Info: Time of Concentration rounded to 6.0000 min in row <1>. channel Fl ow Description ..................... Ditch Flow Area .. .. .. .. .. . .. .. .. .. .. .. 4.5000 ft2 Wetted Perimeter................ 80.4000 in Flow Length ..................... 1783.0000 ft channel slope................... 0.0555 ft/ft Manning's n . .. .. .. .. .. .. .. .. .. .. 0.0175 Hydraulic radius................ 8.0597 in Velocity........................ 15.3421 fps computed channel flow time ..................... > 1.9369 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. *************************** Total Ti me of concentration ......................... > 3. 2698 min **************************** Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. Page 1 PR-13-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR-13-25YR TR-55 Tabular Hydrograph Method , . Input summary Descr1pt1on .................... . PR-13, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Type II on 14.0915 ac 744.0000 min 5.3550 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-13 14.0915 78 24.4511 0.0000 2.0000 support Data: subarea Name: PR-13, Row: 1 sheet Flow Description . . . . . . . . . .. . . .. . . . . . . sheet Manning's n .. . . . . . . .. .. . . . . . . . . . 0.1300 Flow Length . .. . .. . .. . . . . .. . . . . . . 300.0000 ft TWO Yri 24 hr Rainfall .......... 1.2000 in Land s ope .. . . . . . . . . . . . . . .. . . . .. 0.0633 ft/ft computed sheet fl ow ti me ....................... > 21. 67 45 min Messages: Info: Time of concentration rounded to 24.0000 min in row <l>, shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length . . . . . . . . . . . . . . . . . . . . . 731.0000 ft watercourse slope............... 0.1163 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 5. 5023 fps computed Sha 11 ow fl ow ti me ..................... > 2. 2142 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. channel Flow Description ..................... Ditch Fl ow Area . . . .. . . . . . . . . .. .. . . . . .. 4. 5000 ft2 Wetted Perimeter ................ 80.4000 in Flow Length ..................... 635.0000 ft channel slope . . . . . . . . . . . . . . . . . . . 0.0835 ft/ft Manning's n .. . .. . .. . . . . . . . . . .. . . 0.0175 Hydraulic radius . . .. . .. . .. . . . . .. 8.0597 in velocity........................ 18.8184 fps computed channel flow time ..................... > 0.5624 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-13-25YR,txt Total Time of concentration ......................... > 24.4511 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-13-lOOYR,tXt LAKE SPRINGS RANCH 3/1/15 PR-13-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . PR-13, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time .................... , .. Peak Flow ...................... . Given Input Data: Method Type II on 14.0915 ac 744.0000 min 8.2980 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-13 14.0915 78 24.4511 0.0000 2.4000 support Data: subarea Name: PR-13, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. .. .. .. .. .. .. .. . 0.1300 Flow Length ..................... 300.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope...................... 0.0633 ft/ft computed sheet flow time ....................... > 21.6745 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Shallow concentrated Flow Description .. .. .. .. .. .. .. .. .. .. . shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Flow Length..................... 731.0000 ft Watercourse slope............... 0.1163 ft/ft velocity .. .. .. .. .. . .. .. .. .. .. .. . 5. 5023 fps computed shallow flow time ..................... > 2.2142 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. channel Flow Description ..................... Ditch Fl ow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length..................... 635.0000 ft channel slope .. .. .. . .. . .. .. .. .. . 0.0835 ft/ft Manning's n ................... .. 0.0175 Hydraulic radius .. . . ....... ... . . 8.0597 in velocity .. .. .. .. .. .. .. .. . .. . .. .. 18.8184 fps computed channel flow time ..................... > 0.5624 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-13-lO0YR,txt Total Time of concentration ......................... > 24.4511 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>, Page 2 PR-14-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR-14-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-14, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 25.4796 ac 744.0000 min 10.5773 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-14 25.4796 79 24.1730 0.0000 2.0000 support Data: subarea Name: PR-14, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. .. . .. .. . .. . .. .. 0.1300 Flow Length . . . . . . . . . . . . . . . . . . . . . 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope...................... 0.0633 ft/ft computed sheet flow time ....................... > 21.6745 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description ..................... Shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length . . . . . . . . . . . . . . . . . . . . . 906.0000 ft watercourse slope . . . . . . . . . . . . . . . 0.1545 ft/ft Velocity . . . . . . . . . . . . . . . . . . . . . . . . 6.3419 fps computed shallow flow time ..................... > 2.3810 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. channe 1 Fl ow Description ..................... Ditch Flow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 wetted Perimeter................ 80.4000 in Flow Length ..................... 75.0000 ft channe 1 slope . . . . . . . . . . . . . . . . . . . 0. 0267 ft/ft Manning's n . . . . . . . . . . . . . . . . . . . . . 0.0175 Hydraulic radius ...... .. ........ 8.0597 in velocity ... ... .. . . ....... .. . ... . 10.6413 fps computed channel flow time ..................... > 0.1175 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-14-25YR. txt Total Time of concentration ......................... > 24.1730 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-14-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR-15-lOOYR TR-55 Tabular Hydrograph Input summary Description .................... . PR-14, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area .................. , .. . Peak Time ...................... . Peak Flow ....... , .............. . Given Input Data: Method Type II on 25.4796 ac 744.0000 min 16.1490 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-14 25.4796 79 24.1730 0.0000 2.4000 support Data: subarea Name: PR-14, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. .. .. .. .. . .. . .. . 0.1300 Flow Length .. . . . ....... ... ...... 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope .... , . . . . . . . . . . . . . . . . . 0. 0633 ft/ft computed sheet flow time ....................... > 21.6745 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length .................... , 906.0000 ft Watercourse slope ... , .. , . . . . . . . . 0 .1545 ft/ft velocity .............. , . . . . . . . . . 6. 3419 fps computed sha 11 ow fl ow ti me ..................... > 2 . 3810 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Channel Fl ow Description ..................... Ditch Flow Area....................... 4.5000 ft2 wetted Perimeter ........ , . , . . . . . 80. 4000 in Fl ow Length .. .. .. .. .. .. .. .. .. . .. 7 5 . 0000 ft channel slope................... 0.0267 ft/ft Manning's n .. . .. .. . .... . .. .. . .. . 0.0175 Hydraulic radius ................ 8.0597 in velocity . . . . . . . . . . . . . . . . . . . . . . . . 10. 6413 fps computed channel flow time .................... ,> 0.1175 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-14-l00YR.txt Total Time of concentration ......................... > 24.1730 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-15-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR-15-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-15, 25 YR Rainfall Distribution .......... . Ia/P Interpol at ion ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 21. 7402 ac 738.0000 min 11.4550 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-15 21.7402 80 15.5636 0.0000 2.0000 support Data: subarea Name: PR-15, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. .. .. .. .. .. .. .. . 0.1300 Fl ow Length . . . . . . . . . . . . . . . . . . . . . 300. 0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land Slope...................... 0.2000 ft/ft computed sheet flow time ....................... > 13.6804 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Fl ow Length . . . . . . . . . . . . . . . . . . . . . 5 31. 0000 ft watercourse slope............... 0.1240 ft/ft Velocity . . . . . . . . . . . . . . . . . . . . . . . . 5. 6815 fps computed shallow flow time ..................... > 1.5577 min Messages: Info: Time of Concentration rounded to 18.0000 min in row <1>. channel Flow Description .. .. . .. .. .. . .. .. .. .. . Ditch Flow Area . .. .. . .. .. . .. .. .. .. .. .. 4.5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length..................... 276.0000 ft channel slope . . . . . . . . . . . . . . . . . . . 0.0471 ft/ft Manning's n . .. .. .. .. .. .. .. .. .. .. 0.0175 Hydraulic radius................ 8.0597 in velocity .. . .. .. .. .. .. . .. . .. .. .. . 14.1335 fps computea channel flow time ..................... > 0.3255 min Messages: Info: Time of Concentration rounded to 18.0000 min in row <1>. Page 1 PR-15-25YR.tXt Total Time of concentration ......................... > 15.5636 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>, Page 2 PR-15-lOOYR.tXt LAKE SPRINGS RANCH 3/1/15 PR15-100YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-15, 100 YR Rainfall Di stri buti on .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... , Given Input Data: Method Type II on 21. 7402 ac 738.0000 min 17.3003 cfs subarea D/S subareas Area (ac) CN TC (min) Tt Rainfall Description (min) (in) PR-15 21. 7402 80 15.5636 0.0000 2.4000 support Data: subarea Name: PR-15, Row: 1 sheet Flow Description ..................... sheet Manning• s n . . . . . . . . . . . . . . . . . . . . . O. 1300 Flow Length . . . . . . . . . . . . . . . . . . . . . 300. 0000 ft TWO Yr, 24 hr Rainfall ·········· 1.2000 in Land Slope . .. .. .. .. .. .. .. . .. .. .. 0.2000 ft/ft computed sheet fl ow ti me ....................... > 13. 6804 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface ...................... , . . Unpaved Fl ow Length . . . . . . . . . . . . . . . . . . . . . 531. 0000 ft watercourse slope .. , . . . . . . . . . . . . 0.1240 ft/ft Velocity . . . . . . . . . . . . . . . . . . . . . . . . 5.6815 fps computea shallow flow time ..................... > 1.5577 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channe 1 Fl ow Description ..................... Ditch Flow Area .. . .. .. . . .. .. .. .. . . . . .. 4.5000 ft2 wetted Perimeter . ......... .. . ... 80.4000 in Flow Length ..................... 276.0000 ft channel slope . . . . . . . . . . . . . . . . . . . 0.0471 ft/ft Manning's n . . . . . . . . . . . . . . . . . . . . . 0.0175 Hydraulic radius .. . . . . . .. .. .. . .. 8.0597 in Velocity . . .. . .. .. .. .. .. .. . . .. . .. 14.1335 fps computea channel flow time ..................... > 0.3255 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-15-lOOYR.txt Total Time of concentration ......................... > 15. 5636 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-16-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR16-25YR TR-55 Tabular Hydrograph Input summary Description ................. , .. . PR-16, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ... , ................. . Peak Time ...................... . Peak Flow ............... , ...... . Given Input Data: Method Type II on 17.8558 ac 744.0000 min 6.1958 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-16 17.8558 77 21.4322 0.0000 2.0000 support Data: subarea Name: PR-16, Row: 1 sheet Flow Description ..................... sheet Manning's n ............ , ....... , 0.1300 Flow Length . . . . . . . . . . . . . . . . . . . . . 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope,..................... 0.1000 ft/ft computed sheet flow time ....................... > 18.0514 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description , .................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length..................... 1002.0000 ft watercourse slope . . . . . . . . . . . . . . . 0.1218 ft/ft velocity ... .. . . ... ..... ....... .. 5.6309 fps computed shallow flow time ..................... > 2.9658 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. channel Flow Description ..................... Ditch Fl ow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 wetted Perimeter................ 80.4000 in Flow Length ..................... 264.0000 ft Channel Slope................... 0.0265 ft/ft Manning's n ................... , . 0.0175 Hydraulic radius . .. . .. . . . .. .. .. . 8.0597 in velocity . . . . . . . . . . . . . . . . . . . . . . . . 10.6014 fps computed channel flow time ..................... > 0.4150 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-16-25YR.tXt Total Time of concentration ........................ ,> 21.4322 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-16-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR-16-lOOYR TR-55 Tabular Hydrograph Method rnput summary Description .................... . PR-16, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 17.8558 ac Peak Time ....................... 744.0000 min Peak Flow ....................... 9.7511 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-16 17.8558 77 21.4322 0.0000 2.4000 support Data: subarea Name: PR-16, Row: 1 Sheet Flow Description . . . . . . . . . . . . . . . . . . . . . sheet Manning's n . . .. .. . .. .. .. .. . .. . .. 0.1300 Flow Length..................... 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope .. .. .. .. . . .. .. . .. .. .. . 0.1000 ft/ft computed sheet flow time ....................... > 18.0514 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Fl ow Length .. .. .. .. .. .. .. .. .. .. . 1002. 0000 ft Watercourse slope............... 0.1218 ft/ft Velocity .. .. .. .. . .. .. . .. . .. . .. .. 5.6309 fps computea Shall ow fl ow ti me ..................... > 2. 9658 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. channel Flow Description ..................... Ditch Flow Area....................... 4.5000 ft2 Wetted Perimeter ........... .. ... 80.4000 in Flow Length ..................... 264.0000 ft channel slope .. .. .. .. .. .. . .. .. .. 0.0265 ft/ft Manning's n .. .. . .. .. .. . .. .. .. .. . 0.0175 Hydraulic radius................ 8.0597 in Velocity . . . . . . . . . . . . . . . . . . . . . . . . 10.6014 fps computed channel flow time ..................... > 0.4150 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-16-l00YR.txt Total Time of concentration ............... , ......... > 21.4322 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-17-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR17-25YR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-17, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 6.8281 ac Peak Time . . . . . . . . . . . . . . . . . . . . . . . 744.0000 min Peak Fl ow .. . . .. . .. .. . .. .. . . .. .. . 2. 8345 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-17 6.8281 79 21.4322 0.0000 2.0000 support Data: subarea Name: PR-17, Row: 1 sheet Flow Description ..................... sheet Manning's n . . .. . .. .. . . .. .. .. . .. . o. 1300 Flow Length .. .. .. .. .. . .. . . .. .. .. 300.0000 ft TWO Yri 24 hr Rainfall .......... 1.2000 in Land s ope . . . . . . . . . . . . . . . . . . . . . . O .1000 ft/ft computed sheet fl ow ti me ....................... > 18. 0514 min Messages: • Info: Time of concentration rounded to 24.0000 min in row <1>. Shallow concentrated Flow Description ..................... shallow surface ......................... unpaved Flow Length ..................... 1002.0000 ft Watercourse slope . . . . . . . . . . . . . . . 0.1218 ft/ft Velocity .. . . .. . .. .. .. . .. . . . . . . . . 5.6309 fps Computed shallow flow time ..................... > 2.9658 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. channel Flow Description . . . . . . . . . . . . . . . . . . . . . Ditch Flow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length ..................... 264.0000 ft Channel slope . . .. . . . . . .. . . . . . . .. 0.0265 ft/ft Manning's n . . . . . . . . . . . . . . . . . . . . . 0.0175 Hydraulic radius . . . . .. .. .. .. . . . . 8.0597 in Velocity........................ 10.6014 fps computed channel flow time ..................... > 0.4150 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-17-25YR.tXt *************************** Total Time of concentration . , ................. , ..... > 21.4322 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-17-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR17-25YR TR-55 Tabular Hydrograph Input summary Description ....... , . , ... , ...... . PR-17, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ...... , ...... . Total Area ..................... . Peak Time ...................... . Peak Flow ............ , ......... . Given Input Data: Method Type II on 6.8281 ac 744.0000 min 2.8345 cfs subarea D/S subareas Area (ac) CN Tc (min) Tt Rainfall Description (min) (in) PR-17 6.8281 79 21.9886 0.0000 2.0000 support Data: subarea Name: PR-17, Row: 1 Sheet Flow Description .................. , .. Sheet Manning's n ..................... 0.1300 Flow Length . . . . . . . . . . . . . . . . . . . . . 300.0000 ft TWO Yr, 24 hr Rainfall •·•••••··• 1.2000 in Land slope .. .. .. .. .. . . .. . .. . .. .. 0.0767 ft/ft computed sheet flow time .................. , .... > 20.0721 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description ..................... Shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length . . .. . . .. . . .. . . .. .. .. . 755.0000 ft Watercourse slope . . . . . . . . . . . . . . . 0.1656 ft/ft Velocity ........ ........ ........ 6.5658 fps Computed shallow flow time ..................... > 1.9165 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. *************************** Total Time of concentration ......................... > 21.9886 min **************************** Messages: Info: Time of Concentration rounded to 24.0000 min in row <1>. Page 1 PR-17-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR-17-lOOYR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-17, 100 YR Rainfall Distribution .......... . ra/P Interpolation ............. . Total Area ..................... . Type II on 6.8281 ac Peak Time ....................... 744.0000 min Peak Flow .. .. .. . .. .. .. .. .. .. .. .. 4.3277 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-17 6.8281 79 21.9886 0.0000 2.4000 support Data: subarea Name: PR-17, Row: 1 sheet Flow Description ..................... Sheet Manning's n . .. .. . .. . .. .. .. .. .. .. 0.1300 Flow Length ..................... 300.0000 ft TWO Yr, 24 hr Rainfall , . . . . . . . . . 1.2000 in Land slope...................... 0.0767 ft/ft computed sheet flow time ....................... > 20.0721 min Messages: Info: Time of Concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description ..................... Shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Flow Length ..................... 755.0000 ft watercourse slope . . . . .. . .. ...... 0.1656 ft/ft Velocity . . . . . . . . . . . . . . . . . . . . . . . . 6. 5658 fps computed shallow flow time ..................... > 1.9165 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. 'iddt * 'Ir iddr fr 'fr 'fr 'ldr 'fr 'Ir fdt -It 'lr:fdt 'It fr 1'r * fr 'It Total Time of concentration ......................... > 21.9886 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-18-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR18-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-18, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II On 2. 2161 ac 732.0000 min 1.6588 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-18 2.2161 82 12.7015 0.0000 2.0000 support Data: subarea Name: PR-19, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Fl ow Length . . . . . . . . . . . . . . . . . . . . . 88. 0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope...................... 0.0227 ft/ft computed sheet flow time ....................... > 12.2459 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. channel Fl ow Description ..................... Ditch Flow Area....................... 4.5000 ft2 wetted Peri meter . . . . . . . . . . . . . . . . 80. 4000 in Flow Length ..................... 370.0000 ft channel slope ................... 0.0432 ft/ft Manning's n .. .. .. .. .. .. .. . .. .. .. 0.0175 Hydraulic radius ................ 8.0597 in velocity . . .. ....... .. . ..... ..... 13.5357 fps computed channel flow time ..................... > 0.4556 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 12.7015 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 PR-18-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR18-100YR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-18, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 2.2161 ac Peak Time ....................... 732.0000 min Peak Flow .. . .. .. .. .. .. .. .. .. .. .. 2.4262 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -----------------------------.-------------------------------------------------- PR-18 2.2161 82 12.7015 0.0000 2.4000 support Data: subarea Name: PR-18, Row: 1 sheet Flow Description . . . . . . . . . . . . . . . . . . . . . Sheet Manning's n .. .. .. .. .. .. .. .. .. .. . 0.1300 Flow Length . .. . . .. .. . .. . . .. ... .. 88.0000 ft TWO Yr; 24 hr Rainfall •••••••••• 1.2000 in Lands ope...................... 0.0227 ft/ft computed sheet flow time ....................... > 12.2459 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. channel Flow Description ..................... Ditch Fl ow Area .. .. .. .. .. .. .. .. .. .. .. . 4. 5000 ft2 Wetted Perimeter ... ........ ..... 80.4000 in Flow Length ..................... 370.0000 ft channel slope................... 0.0432 ft/ft Manning's n ..................... 0.0175 Hydraulic radius ................ 8.0597 in Velocity........................ 13.5357 fps computed channel flow time ..................... > 0.4556 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 12.7015 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 PR-19-25YR Hydrograph type :::: scs Peak discharge (cfs) :::: 2.017 Storm frequency {yrs) :::: 25 Time interval (min) :::: 1 Drainage area (ac) = 4.510 Curve number {CN) :::: 78 Basin Slope(%) :::: n/a Hydraulic length (ft) = n/a Tc method = User Time of cone. (min) = 22 Total precip. (in) :::: 2.00 Storm Distribution == Type II Storm duration (hrs) = 24 Shape factor == 484 Hydrograph Volume= 7,859 (cuft); 0.180 (acft) Runoff Hydrograph Q (cfs) 25-yr frequency Q (cfs) 3.00 ~--------~----~-~----~-~--~---~ 3.00 2.00 -+-----+--t---+---+--+----------+--+----+----+----t---+----+-2.00 1. 00 -+-----+--t---!---+--+-----!i-1t--+--+---+---+---t---+----t-1.00 ·.· .. •. " I.··· ·.·· ~ . ·.••,•· .. 0.00 --------------L,L_-~ __ .,____......,__ _ ___._ __ _,_ _ _,_,.c___...._ 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 2.02 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 30® by Autodesk, Inc. Monday, Nov 24 2025 PR-19-1 00YR Hydrograph type ::: Storm frequency (yrs) ::: Drainage area (ac) = Basin Slope(%) ::: Tc method ::: Total precip. (in) = Storm duration (hrs) ::: SGS 100 4.510 n/a User 2.40 24 Peak discharge (cfs) Time interval (min) Curve number (CN) Hydraulic length (ft) Time of cone. (min) Storm Distribution Shape factor == 3.218 ::: 1 == 78 = n/a = 22 == Type 11 == 484 Hydrograph Volume= 11,744 (cufl); 0.270 (acft) Runoff Hydrograph Q (cfs) 100-yr frequency Q (cfs) 4.00 ~-----------,---..------r---,----,----.--------.---......----,..--~ 4.00 0.00 _____ ....._ __________ _,___ _ __,_ __ .__ _ _._ _ ___.L __ .1--_.....J...::<O~.----..L 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 3.22 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 30® by Autodesk, Inc. Monday, Nov 24 2025 PR-20-25YR Hydrograph type = scs Peak discharge (cfs) = 2.446 Storm frequency (yrs) = 25 Time interval (min) = 1 Drainage area (ac) = 5.470 Curve number (CN) = 78 Basin Slope(%) = n/a Hydraulic length (ft) = n/a Tc method = User Time of cone. (min) = 22 Total precip. (in) = 2.00 Storm Distribution = Type II Storm duration (hrs) = 24 Shape factor = 484 Hydrograph Volume= 9,532 (cuft); 0.219 (acft) Runoff Hydrograph Q (cfs) 25-yr frequency Q {cfs) 3. 00 --,------.----.----,-----.--.-----r----r--.-----.------.--,-----r-------. 3.00 I· .. . . ..... ..... . ... . .. 2.00 2.00 .· .· .· .··.· ... , .. · ...... ... .. . . 1.00 1.00 \ __ 7--,--~-~-.l, 0.00 -----=---------,_._ _ _,__ __ .,__ _ ____,__ _ ____,,_ __ _,___ _ __,___,,.......__...,_ 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Op= 2.45 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 PR-20-1 00YR Hydrograph type = Storm frequency (yrs) = Drainage area (ac) = Basin Slope(%) = Tc method = Total precip. (in) = Storm duration (hrs) = scs 100 5.473 nla User 2.40 24 Peak discharge (cfs) Time interval (min} Curve number (CN) Hydraulic length (ft) Time of cone. (min) Storm Distribution Shape factor = 3.906 = 1 = 78 = n/a = 22 = Type II = 484 Hydrograph Volume= 14,252 (cuft); 0.327 (acft) Runoff Hydrograph Q (cfs) 100-yr frequency Q (cfs) 4 .00 ~-----.-----.---.....-----.---~----,----,------r-------.---.------.------.-------.-4. 00 3.00 -+---+----+--+---~--+----tt-t---+---+----+---t----+---+---1-3.00 2.00 -----------+----+-----1---+----t----+--------+---2.00 1.00 -------+--+-----+----+------llli--+---+----t----+--~--------1-1.00 \ .... • ... .•• ......___,..........,~~~~ ........... .l 0.00 _________ .._ ____ ......,_,tli<.J_.__--'----''---..l....--__._ _ ___._ __ ...., .... L___._ 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 3.91 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 PR-21-25YR Hydrograph type Storm frequency (yrs) Drainage area (ac) Basin Slope(%) Tc method Total precip. (in) Storm duration (hrs) Q (cfs) 0.50 0.45 0.35 0.30 0.25 0.20 0.15 0.10 0.05 = scs = 25 = 1.636 = n/a = User = 2.00 = 24 Peak discharge (cfs) = 0.252 Time interval (min) = 1 Curve number (CN) = 69 Hydraulic length (ft) = n/a Time of cone. (min) = 16 Storm Distribution = Type II Shape factor = 484 Hydrograph Volume "' 1,304 (cuft); 0.030 (acft) Runoff Hydrograph 25-yr frequency \ " ....._____ Q (cfs) 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp:::: 0.25 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 PR-21-1 00YR Hydrograph type ::::: scs Peak discharge (cfs) ::::: 0.583 Storm frequency (yrs) ::::: 100 Time interval (min) ::::: 1 Drainage area (ac) ::::: 1.640 Curve number (CN) ::::: 69 Basin Slope (%) ::::: n/a Hydraulic length (ft) ::::: n/a Tc method ::::: User Time of cone. (min) ::::: 16 Total precip. (in) ::::: 2.40 Storm Distribution = Type II Storm duration (hrs) ::::: 24 Shape factor = 484 Hydrograph Volume= 2,267 (cutt); 0.052 (acft) Runoff Hydrograph Q (cfs) 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 100-yr frequency \ ' - Q (cfs) 1.00 0.90 0.80 0.70 0.60 0.50 0.30 0.20 0.10 .. 0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 26.0 Time (hrs) -Runoff Hyd -Qp = 0.58 (cfs) PR-22-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR22-25YR TR-55 Tabular Hydrograph Input summary Des~~!!J!o~5 .~i········ •......... Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 11. 3726 ac 738.0000 min 5.0196 cfs subarea D/S subareas Area (ac) CN Tc (min) Tt Rainfall Description (min) (in) PR-22 11.3726 78 17.2935 0.0000 2.0000 support Data: subarea Name: PR-22, Row: 1 sheet Flow Description . . . . . . . . . . . . . . . . . . . . . sheet Manning's n .. .. .. .. .. . . . . . . . . . .. 0.1300 Flow Length . . . . . . . . . . . . . . . . . . . . . 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope...................... 0.1500 ft/ft computed sheet flow time ....................... > 15.3488 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 200.0000 ft watercourse slope . . . . . . . . . . . . . . . 0.0400 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 3.2269 fps computea shallow flow time ..................... > 1.0330 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channel Fl ow Description ..................... Ditch Flow Area . .. . .. . . .. .. . .. .. .. . . . . 4. 5000 ft2 Wetted Perimeter................ 80.4000 in Fl ow Length . . . . . . . . . . . . . . . . . . . . . 791. 0000 ft channel slope................... 0.0493 ft/ft Manning's n . . . .. . . .. .. .. .. .. .. .. 0.0175 Hydraulic radius ................ 8.0597 in Velocity........................ 14.4598 fps computed channel flow time ..................... > 0.9117 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-22-25YR,tXt Total Time of concentration ......................... > 17 .2935 min **************************** Messages: rnfo: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-22-lOOYR,txt LAKE SPRINGS RANCH 3/1/15 PR22-100YR TR-55 Tabular Hydrograph Method Input summary Des~~!~}~o~oo·vR········ ••••••••• Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ..................... .. Peak Flow ...................... . Given Input Data: Type II on 11. 3726 ac 738.0000 min 7.8092 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-22 11.3726 78 17.2935 0.0000 2.4000 support Data: subarea Name: PR-22, Row: 1 Sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . o. 1300 Flow Length .. .. . .. .. . .. .. .. .. .. . 300.0000 ft TWO Yr, 24 hr Rainfall . . ... ..... 1.2000 in Land Slope...................... 0.1500 ft/ft computed sheet flow time ....................... > 15.3488 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description .. . .. . .. . .. .. .. . .. .. . sha 11 ow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 200.0000 ft watercourse slope............... 0.0400 ft/ft velocity .. .. .. .. . .. .. .. . .. .... .. 3.2269 fps computed shallow flow time ..................... > 1.0330 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Channel Flow Description .. .. . .. .. . .. .. .. .. .. . Ditch Flow Area .. .. .. .. .. .. .. . .. .. .. .. 4.5000 ft2 wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length ..................... 791.0000 ft channel slope .. .. . .. .. .. . .. .. .. . 0.0493 ft/ft Manning's n .. .. . .. .. . .. . .. .. .. .. 0.0175 Hydraulic radius................ 8.0597 in velocity . . . . . . . . . . . . . . . . . . . . . . . . 14.4598 fps computed Channel flow time ..................... > 0.9117 min Messages: Info: Time of Concentration rounded to 18.0000 min in row <1>. Page 1 PR-22-lO0YR.txt Total Time of concentration ......................... > 17.2935 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-23-25YR.txt LAl<E SPRINGS RANCH 3/1/15 PR23-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-23, 25 YR Rain fa 77 Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 9. 7614 ac 744.0000 min 1.4567 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) Ci n) -------------------------------------------------------------------------------PR-23 9.7614 71 26.4578 0.0000 2.0000 support Data: subarea Name: PR-23, Row: 1 sheet Flow Description ..................... sheet Manning's n ..................... 0.1300 Flow Length ..................... 300.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope...................... 0.0467 ft/ft computed sheet flow time ....................... > 24. 4784 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. shallow Concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length..................... 139.0000 ft Watercourse slope . . . . . . . . . . . . . . . 0.0432 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 3. 3535 fps computed shallow flow time ..................... > 0.6908 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Channel Flow Description ..................... Ditch Fl ow Area .. .. .. .. .. .. .. .. .. .. .. . 4. 5000 ft2 Wetted Perimeter................ 80.4000 in Flow Length ..................... 1222.0000 ft channel Slope ................... 0.0589 ft/ft Manning's n . .. .. .. . .. .. . .. .. .. .. 0.0175 Hydraulic radius ................ 8.0597 in velocity........................ 15.8051 fps computed channel flow time ..................... > 1.2886 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-23-25YR.txt Total Time of concentration ........................ ,> 26.4578 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 2 PR-23-lOOYR.tXt LAKE SPRINGS RANCH 3/1/15 PR23-100YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-23, 100 YR Rainfall Distribution ......... .. Ia/P Interpolation ............ .. Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II On 9.7614 ac 744.0000 min 2.9981 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-23 9.7614 71 26.4578 0.0000 2.4000 support Data: subarea Name: PR-23, Row: 1 sheet Flow Description ..................... Sheet Manning's n . .. . .. .. . .. .. .. .. .. .. 0.1300 Flow Length .......... .. ..... .... 300.0000 ft TWO Yr; 24 hr Rainfall . . . . . . . . . . 1. 2000 in Lands ope...................... 0.0467 ft/ft computed sheet flow time ....................... > 24.4784 min Messages: Info: Time of Concentration rounded to 24.0000 min in row <1>. shallow concentrated Flow Description .. .. . .. .. . .. . .. . . .. .. Shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Flow Length ..................... 139.0000 ft watercourse slope . . . . . . . . . . . . . . . 0.0432 ft/ft Velocity .. .. .. .. .. .. . .. .. .. .. .. . 3.3535 fps computed shallow flow time ..................... > 0.6908 min Messages: Info: Time of Concentration rounded to 24.0000 min in row <1>. channel Flow Description ..................... Ditch Flow Area....................... 4.5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length..................... 1222.0000 ft Channel slope................... 0.0589 ft/ft Manning's n .. .. .. .. .. .. .. .. .. .. . 0.0175 Hydraulic radius .. .. .. .. .. .. .. .. 8.0597 in Velocity........................ 15.8051 fps computed Channel flow time ..................... > 1.2886 min Messages: Info: Time of concentration rounded to 24.0000 min in row <1>. Page 1 PR-23-l00YR,txt Total Time of Concentration , , . , , , , , , , , , , , . , . , ....... > 26.4578 min **************************** Messages: Info: Time of concentration rounded to 24.0000 min in row <l>. Page 2 PR-24-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR24-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-24, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 2.0850 ac 738.0000 min 0.5737 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-24 2.0850 74 16.2920 0.0000 2.0000 support Data: subarea Name: PR-24, Row: 1 Sheet Flow Description ..................... sheet Manning's n ..................... 0.1300 Flow Length..................... 300.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope...................... 0.1467 ft/ft computed sheet fl ow ti me ....................... > 15. 4860 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description . . . . .. . . .. . .. . . . .. .. . shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 50.0000 ft watercourse slope............... 0.1400 ft/ft Velocity . . . . . . . . . . . . . . . . . . . . . . . . 6.0370 fps computea shallow flow time ..................... > 0.1380 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channel Flow Description ..................... Ditch Flow Area....................... 4.5000 ft2 Wetted Perimeter................ 80.4000 in Flow Length ..................... 602.0000 ft channe 1 slope . . . . . . . . . . . . . . . . . . . O. 0532 ft/ft Manning's n . . . . . . . . . . . . . . . . . . . . . 0.0175 Hydraulic radius ......... .. .. ... 8.0597 in velocity .............. .. . . . .. ... 15.0209 fps computed channel flow time ..................... > 0.6680 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-24-25YR.txt Total Time of concentration ......................... > 16.2920 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-24-lOOYR.txt LAKE SPRING RANCH 3/1/15 PR24-100YR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-24, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 2.0850 ac Peak Time ....................... 738.0000 min Peak Flow . . . . . . . . . . . . . . . . . . . . . . . 1.0404 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-24 2.0850 74 16.2920 0.0000 2.4000 support Data: subarea Name: PR-24, Row: 1 Sheet Flow Description ..................... sheet Manning's n .. .. .. .. .. .. .. .. .. .. . 0.1300 Flow Length ..................... 300.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope . . . . . . . . . . . . . . . . . . . . . . 0.1467 ft/ft computed sheet flow time ....................... > 15.4860 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description .. .. .. .. .. .. .. . .. .. .. shallow surface ......................... unpaved Flow Length..................... 50.0000 ft Watercourse slope............... 0.1400 ft/ft Velocity . . . . . . . . . . . . . . . . . . . . . . . . 6.0370 fps computed Sha 11 ow fl ow ti me ..................... > O .1380 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channel Flow Description ..................... Ditch Fl ow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length ..................... 602.0000 ft channel slope . . . . . . . . . . . . . . . . . . . 0.0532 ft/ft Manning's n .. .. .. .. .. .. .. .. .. .. . 0.0175 Hydraulic radius ................ 8.0597 in Velocity .. . .. .. .. .. . .. .. .. .. .. .. 15.0209 fps computed channel fl ow ti me ..................... > O. 6680 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-24-l00YR.txt Total Time of concentration ......................... > 16.2920 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-25-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR25-25YR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-25, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 13 .9490 ac Peak Time ....................... 738.0000 min Peak Flow ....................... 1.4388 cfs Given Input Data: subarea o/s subareas Area CN Tc Tt Rainfall oescri pti on (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-25 13.9490 68 17.1626 0.0000 2.0000 support Data: subarea Name: PR-25, Row: 1 sheet Flow Description . . . . . . . . . . . . . . . . . . . . . sheet Manning's n . . . . . . . . . . . . . . . . . . . . . o. 1300 Flow Length ..................... 300.0000 ft Two Yr, 24 hr Rainfall ....... ... 1.2000 in Land Slope...................... 0.1833 ft/ft computed sheet flow time ....................... > 14.1659 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface ......................... unpaved Flow Length .. .. .. .. . .. .. .. .. . .. . 805.0000 ft Watercourse Slope............... 0.0770 ft/ft velocity ............ ....... .. ... 4.4771 fps computea sha 11 ow fl ow ti me ............ , ........ > 2. 9967 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 17.1626 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-25-lOOYR. txt LAKE SPRINGS RANCH 3/1/15 PR25-100YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-25, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area .................. , .. . Peak Time ..... , ................ . Peak Flow ............... , .. , ... . Given Input Data: Method Type II on 13. 9490 ac 738. 0000 min 3.3654 cfs subarea D/S subareas Area (ac) CN Tc (min) Tt Rainfall Description (min) (in) PR-25 13 .9490 68 17.1626 0.0000 2.4000 support Data: subarea Name: PR-25, Row: 1 Sheet Flow Description ..................... sheet Manning's n .. . .. .. .. .. .. .. .. .. .. 0.1300 Flow Length ..................... 300.0000 ft TWO Yr, 24 hr Rainfall ..... ..... 1.2000 in Land slope .. .. .. .. .. .. .. . .. . .. .. 0.1833 ft/ft computed sheet flow time ....................... > 14.1659 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description . . . . . . . . . . . . . . . . . . . . . sha 11 ow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 805.0000 ft watercourse slope............... 0.0770 ft/ft velocity........................ 4.4771 fps computed shallow flow time ..................... > 2. 9967 min Messages: Info: Time of Concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ........................ ,> 17.1626 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-26-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR26-25YR TR-55 Tabular Hydrograph Method Input summary Des~~~~~~o~5-YR········ •••••••••• Rainfall Distribution .......... . Ia/P Interpol at ion ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Type II on 1.0478 ac 726.0000 min 0.7476 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-26 1.0478 78 6.0000 0.0000 2.0000 support Data: subarea Name: PR-26, Row: 1 sheet Flow Description ..................... sheet Manning's n . . .... ... . . ....... ... 0.1300 Flow Length..................... 80.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1. 2000 in Land slope...................... 0.3750 ft/ft computed sheet flow time ....................... > 3.6955 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. channel Fl ow Description ..................... Ditch Flow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length . .... ........... ..... 835.0000 ft channel slope .. .. . .. .. .. . .. .. . .. 0.0719 ft/ft Manning's n . .. . .. .. . .. . .. .. .. .. . 0.0175 Hydraulic radius . .. .. . .. . . . . . . .. 8. 0597 in velocity .. . . .. . . . . . . .. . . . . .. . . .. 17 .4624 fps computea channel flow time ..................... > o. 7970 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. *************************** Total Ti me of concentration ......................... > 4. 4925 min **************************** Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. Page 1 PR-26-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR26-100YR TR-55 Tabular Hydrograph Method Input summary Des c ri pt ion .................... . PR-26, 100 YR Rai nfa 11 Di st ri buti on .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 1.0478 ac Peak Time ....................... 726.0000 min Peak Flow ....................... 1.1377 cfs Given Input Data: subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-26 1.0478 78 6.0000 0.0000 2.4000 support Data: subarea Name: PR-26, Row: 1 sheet Flow Description . . . . . . . . . . . . . . . . . . . . . sheet Manning's n . .. . .. . . ........ ..... 0.1300 Flow Length .. .. .. .. .. .. .. .. . .. .. 80.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . . . 1.2000 in Land slope...................... 0.3750 ft/ft Computed sheet flow time ....................... > 3.6955 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. channel Flow Description . . . . . . . . . . . . . . . . . . . . . Ditch Flow Area....................... 4.5000 ft2 Wetted Perimeter .. . .. .. .. .. .. .. . 80. 4000 in Flow Length..................... 835.0000 ft channel slope .. .. .. .. .. . .. .. .. .. 0.0719 ft/ft Manning's n .. .. .. .. .. . .. .. .. .. .. 0.0175 Hydraulic radius ................ 8.0597 in Velocity........................ 17.4624 fps computed channel flow time ..................... > 0.7970 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. *************************** Total Time of concentration ......................... > 4.4925 min **************************** Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. Page 1 PR-27-25YR.tXt LAKE SPRINGS RANCH 3/1/15 PR27-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-27, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II On 12.3697 ac 732.0000 min 1. 9016 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-27 12.3697 69 14.7032 0.0000 2.0000 support Data: subarea Name: PR-27, Row: 1 sheet Flow Description ..................... Sheet Manning's n .. .. .. .. .. .. . .. .. .. .. 0.1300 Fl ow Length . .. .. .. .. .. .. .. .. .. .. 300. 0000 ft TWO Yri 24 hr Rainfall . . . . . . . . . . 1.2000 in Lands ope...................... 0.1800 ft/ft computed sheet flow time ....................... > 14.2693 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Flow Length . . . . . . . . . . . . . . . . . . . . . 212.0000 ft watercourse slope............... 0.2547 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 8.1427 fps computei:1 shallow flow time ..................... > 0.4339 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ......................... > 14.7032 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 PR-27-lOOYR,tXt LAKE SPRINGS RANCH 3/1/15 PR27-100YR TR-55 Tabular Hydrograph Input summary Description ........ , ........... . PR-27, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ......... , ........... . Peak Time .......... , ........... . Peak Flow ..................... .. Given Input Data: Method Type II on 12.3697 ac 732.0000 min 4.1850 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-27 12.3697 69 14.7032 0.0000 2.4000 support Data: subarea Name: PR-27, Row: 1 sheet Flow Description . , . . . . . . . . . . . . . . . . . . . sheet Manning's n .. .. .. .. . .. .. .. .. . .. . 0.1300 Flow Length .. .. .. .. . .. .. .. .. .. .. 300.0000 ft TWO Yr, 24 hr Rainfall ........ ,. 1.2000 in Land slope...................... 0.1800 ft/ft computed sheet flow time ....................... > 14.2693 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. shallow concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Flow Length ..................... 212.0000 ft watercourse slope . ....... ... .. . . 0.2547 ft/ft velocity .. . .. .. .. .. .. .. .. .. .. .. . 8.1427 fps computea shallow flow time ..... , ............... > 0.4339 min Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. *************************** Total Time of concentration ..... , ................... > 14. 7032 min **************************** Messages: Info: Time of concentration rounded to 12.0000 min in row <1>. Page 1 PR-28-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR28-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-28, 25 YR Rainfall Di stri but ion .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ..................... .. Given Input Data: Method Type II on 16.1193 ac 738.0000 min 4.4354 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-28 16.1193 74 17.8804 0.0000 2.0000 support Data: subarea Name: PR-28, Row: 1 sheet Flow Description ..................... sheet Manning's n .. . . .. .. .. .. . . . .. . .. . 0.1300 Flow Length ..................... 300.0000 ft TWO Yr, 24 hr Rainfall .. .. .. .. . . 1.2000 in Land slope...................... 0.1267 ft/ft computed sheet flow time ....................... > 16.4210 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow Concentrated Flow Description ..................... shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length ..................... 331.0000 ft Watercourse slope .. .. . . .. . .. . ... 0.0906 ft/ft Velocity .. . . . . . . .. .. .. .. .. . .. . .. 4.8565 fps computed shallow flow time ..................... > 1.1359 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channel Flow Description ..................... Ditch Fl ow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 . Wetted Perimeter................ 80.4000 in Flow Length . . . . . . . . . . . . . . . . . . . . . 260. 0000 ft channel slope................... 0.0423 ft/ft Manning's n .. . ... .. ............. 0.0175 Hydraulic radius ................ 8.0597 in Velocity........................ 13.3940 fps computed channel flow time ..................... > 0.3235 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-28-25YR. txt Total Time of concentration ......................... > 17.8804 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-28-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR28-100YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-28, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ..................... .. Given Input Data: Method Type II on 16.1193 ac 738.0000 min 8.0438 cfs subarea D/S subareas Area (ac) CN TC (min) Tt Rainfall Description (min) (in) PR-28 16.1193 74 17.8804 0.0000 2.4000 support oata: subarea Name: PR-28, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Flow Length .. .. . .. .. .. . .. .. .. . .. 300.0000 ft TWO Yr, 24 hr Rainfall .. . . ... ... 1.2000 in Land slope...................... 0.1267 ft/ft computed sheet fl ow ti me ....................... > 16. 4210 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. shallow concentrated Flow Description . . . . . . . . . . . . . . . . . . . . . shallow surface . . . . . . . . . . . . . . . . . . . . . . . . . unpaved Flow Length .. .. .. .. .. .. .. .. .. . .. 331.0000 ft watercourse slope............... 0.0906 ft/ft velocity . . . . . . . . . . . . . . . . . . . . . . . . 4. 8565 fps computed shallow flow time ..................... > 1.1359 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>, channel Flow Description ..................... Ditch Flow Area....................... 4.5000 ft2 wetted Perimeter . .. .. ... . . . . . .. . 80.4000 in Flow Length .. .. .. .. .. .. . .. .. .. .. 260.0000 ft channel Slope .. .. .. . .. .. .. . .. . .. 0.0423 ft/ft Manning's n . ...... ... .... .... .. . 0.0175 Hydraulic radius ................ 8.0597 in velocity . . . . . . . . . . . . . . . . . . . . . . . . 13.3940 fps computed channel flow time ..................... > 0.3235 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-28-l00YR,txt Total Time of concentration ........................ ,> 17.8804 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 2 PR-29-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR29-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-29, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area .... , .......... , ..... . Peak Time ..... , ................ . Peak Flow ...................... . Given Input Data: Method Type II On 5.2776 ac 738.0000 min 0.7881 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-29 5.2776 70 16.7291 0.0000 2.0000 support Data: subarea Name: PR-29, Row: 1 I sheet Flow Description ..................... sheet Manning's n .. .. .. .. .. . .. .. .. .. .. 0.1300 Flow Length ..................... 200.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope...................... 0.0600 ft/ft computed sheet flow time ....................... > 16.0095 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channel Fl ow Description . .. .. .. . .. .. . .. .. .. .. Ditch Flow Area....................... 4.5000 ft2 Wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length ..................... 605.0000 ft channel slope................... 0.0463 ft/ft Manning's n .. .. .. . .. .. .. .. . .. .. . 0.0175 Hydraulic radius . .. .. .. .. .. .. .. . 8. 0597 in velocity........................ 14.0130 fps computed channel flow time ..................... > 0.7196 min Messages: Info: Time of Concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 16.7291 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-29-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR29-100YR TR-55 Tabular Hydrograph Method Input summary Description .................... . PR-29, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Type II on 5. 2776 ac Peak Time ....................... 738.0000 min Peak Flow ....................... 1.6685 cfs Given Input Data: -------------------------------------------------------------------------------subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-29 5.2776 70 16.7291 0.0000 2.4000 support Data: subarea Name: PR-29, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Flow Length ..................... 200.0000 ft TWO Yr, 24 hr Rainfall .. .. .. .. .. 1.2000 in Land slope...................... 0.0600 ft/ft computed sheet flow time ....................... > 16.0095 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. channel Fl ow Description .. , , , ................ Ditch Fl ow Area .. .. .. .. . .. .. .. .. . .. .. . 4. 5000 ft2 wetted Perimeter . . . . . . . . . . . . . . . . 80.4000 in Flow Length .. .. .. .. .. .. .. .. .. . .. 605.0000 ft channel slope .. .. .. .. .. .. .. .. .. . 0.0463 ft/ft Manning's n .. .. .. .. .. .. .. .. .. .. . 0.0175 Hydraulic radius . . .. ... . .. .. .. .. 8.0597 in Velocity . . . . . . . . . . . . . . . . . . . . . . . . 14. 0130 fps computed channel flow time ..................... > 0.7196 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 16.7291 min **************************** Messages: Info: Time of Concentration rounded to 18.0000 min in row <1>. Page 1 PR-30-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR30-25YR TR-55 Tabular Hydrograph Input summary Des~~!~~!o~5 ·~~····· ••••••••••••• Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Fl ow ....... , . , ............ . Given Input Data: Method Type II on 1.0133 ac 726.0000 min 0.8501 cfs -------------------------------------------------------------------------------subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-30 1.0133 80 6.0000 0.0000 2.0000 support Data: subarea Name: PR-30, Row: 1 sheet Flow Description ..................... sheet Manning's n . .. . . .. .. .. . . . . . . . . . . 0.1300 Flow Length . . . . ...... .. .... .. .. . 60.0000 ft TWO Yr, 24 hr Rainfall .......... 1.2000 in Land slope . . . .. . . . . . . . . . .. . . . . . . O. 3667 ft/ft computed sheet fl ow ti me ....................... > 2. 9622 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. channel Fl ow Description ..................... Ditch Fl ow Area .. .. . .. .. .. . . . . .. . . .. . . 4. 5000 ft2 wetted Perimeter................ 80.4000 in Flow Length . . . . .. . . .. .. .. .. .. .. . 486.0000 ft channel slope................... 0.0535 ft/ft Manning's n . . . ... .. ....... ...... 0.0175 Hydraulic radius ............... , 8.0597 in velocity . . . .. .. . . . . . .. .. .. . . .. . . 15. 0632 fps computed channel flow time ..................... > 0.5377 min Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. *************************** Total Time of concentration ......................... > 3.4999 min **************************** Messages: Info: Time of concentration rounded to 6.0000 min in row <1>. Page 1 PR-30-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR30-100YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-30, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 1.0133 ac 726.0000 min 1. 2599 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-30 1.0133 80 6.0000 0.0000 2.4000 support Data: subarea Name: PR-30, Row: 1 sheet Flow Description ..................... sheet Manning's n .. .. .. .. .. .. .. . . . . . .. 0.1300 Flow Length ..................... 60.0000 ft TWO Yr, 24 hr Rainfall •••••••••• 1.2000 in Land slope . . . . . . . . . . . . . . . . . . . . . . 0. 3667 ft/ft computed sheet flow time ....................... > 2.9622 min Messages: Info: Time of concentration rounded to 6.0000 min in row <l>. channe 1 Fl ow Description ..................... Ditch Flow Area . . . . . . . . . . . . . . . . . . . . . . . 4. 5000 ft2 wetted Peri meter . . . . . . . . . . . . . . . . 80. 4000 in Flow Length .. .. .. .. .. .. .. .. .. .. . 486.0000 ft channel slope .. .. .. .. .. .. .. .. .. . 0.0535 ft/ft Manning's n .. .. ........ ... ...... 0.0175 Hydraulic radius................ 8.0597 in velocity .. . .. .. .. .. .. .. .. .. . .. .. 15.0632 fps computea channel flow time ..................... > 0.5377 min Messages: Info: Time of concentration rounded to 6.0000 min in row <l>. *************************** Total Time of concentration ......................... > 3.4999 min **************************** Messages: Info: Time of concentration rounded to 6.0000 min in row <l>. Page 1 PR-31-25YR.txt LAKE SPRING RANCH 3/1/15 PR31-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-31, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ..................... .. Given Input Data: Method Type II on 1. 2525 ac 738.0000 min 0.1565 cfs -------------------------------------------------------------------------------subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-31 1.2525 69 18.4096 0.0000 2.0000 support Data: subarea Name: PR-31, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . .. . . . . . . . . . . . O. 1300 Flow Length ..................... 275.0000 ft TWO Yr, 24 hr Rainfall . . . . . . . . .. 1.2000 in Land slope . . . . . . . . . . . . . . . . . . . . . . O. 0800 ft/ft computed sheet flow time ....................... > 18.4096 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Tota 1 Ti me of concentration ......................... > 18. 4096 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-31-lOOYR.txt LAKE SPRINGS RANCH 3/1/15 PR31-100YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-31, 100 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 1. 2525 ac 738.0000 min 0.3472 cfs -------------------------------------------------------------------------------subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-31 1.2525 69 18.4096 0.0000 2.4000 support Data: subarea Name: PR-31, Row: 1 sheet Flow Description ..................... Sheet Manning's n ..................... 0.1300 Flow Length..................... 275.0000 ft TWO Yr, 24 hr Rainfall . . .. .. .. . . 1.2000 in Land Slope...................... 0.0800 ft/ft computed sheet fl ow ti me ....................... > 18. 4096 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 18.4096 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-32-25YR.txt LAKE SPRINGS RANCH 3/1/15 PR32-25YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-32, 25 YR Rainfall Distribution .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ...................... . Peak Flow ...................... . Given Input Data: Method Type II on 0.8678 ac 738.0000 min 0.1790 cfs -------------------------------------------------------------------------------subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-32 0.8678 72 16.2534 0.0000 2.0000 support Data: subarea Name: PR-31, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0.1300 Flow Length..................... 184.0000 ft TWO Yrj 24 hr Rainfall .......... 1.2000 in Lands ope...................... 0.0489 ft/ft computed sheet flow time ....................... > 16.2534 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 16.2534 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 PR-32-l00YR.txt LAKE SPRINGS RANCH 3/1/15 PR32-100YR TR-55 Tabular Hydrograph Input summary Description .................... . PR-32, 100 YR Rainfall Di stri but ion .......... . Ia/P Interpolation ............. . Total Area ..................... . Peak Time ..................... .. Peak Flow ..................... .. Given Input Data: Method Type II on 0.8678 ac 738.0000 min 0. 3502 cfs subarea D/S subareas Area CN Tc Tt Rainfall Description (ac) (min) (min) (in) -------------------------------------------------------------------------------PR-32 0.8678 72 16.2534 0.0000 2.4000 support Data: subarea Name: PR-32, Row: 1 sheet Flow Description ..................... sheet Manning's n . . . . . . . . . . . . . . . . . . . . . 0. 1300 Flow Length .. .. .. .. . .. .. . .. .. .. . 184.0000 ft TWO Yr, 24 hr Rainfall .. .. .. . .. . 1.2000 in Land slope . . . . . . . . . . . . . . . . . . . . . . 0.0489 ft/ft computed sheet flow time ....................... > 16.2534 min Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. *************************** Total Time of concentration ......................... > 16.2534 min **************************** Messages: Info: Time of concentration rounded to 18.0000 min in row <1>. Page 1 Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 Overall Existing to Pond 25-yr Hydrograph type = SCS Storm frequency (yrs) = 25 Drainage area (ac) = 3054.570 Basin Slope (%) Tc method Total precip. (in) Storm duration (hrs) = n/a = User = 2.00 = 24 Peak discharge (cfs) Time interval (min) Curve number (CN) Hydraulic length (ft) Time of cone. (min) Storm Distribution Shape factor = 303.65 = 1 = 75 = n/a = 116 = Type II = 484 Hydrograph Volume= 4,223,949 (cuft); 96.969 (acft) Runoff Hydrograph 25-yr frequency Q (cfs) Q (cfs) 320.00 -.-------r-----r-------.------r-------r----.----.------r-------r------.-320.00 280.00 240.00 200,00 160.00 120.00 0.00 ---------=-----..U....--~----'------'---------'---""""-I---_L. 0.00 0.0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 Time (hrs} -Runoff Hyd -Qp = 303.65 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, Nov 24 2025 Overall Existing to Pond 100-yr Hydrograph type = SCS Storm frequency (yrs) = 100 Drainage area (ac) = 3054.570 Basin Slope (%) Tc method Total precip. (in) Storm duration (hrs) = n/a = User = 2.40 = 24 Peak discharge (cfs} Time interval (min) Curve number (CN) Hydraulic length (ft) Time of cone. {min) Storm Distribution Shape factor = 520.17 = 1 = 75 = n/a = 116 = Type II = 484 Hydrograph Volume= 6,575,038 (cuft); 150.942 (acft) Runoff Hydrograph 100-yr frequency Q (cfs) Q (cfs) 560.00 -,----.-----.--------.-----.-------r------.-----..--------.-----.-----,-560.00 480.00 160.00 0.00 ...i....-----...i....--....i... .............. .,lf.L __ _L_ __ ___._ __ ___L __ ___L _ __..;_~ __ _____L 0.00 0.0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 Time (hrs) -Runoff Hyd -Qp = 520.17 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. '"&.., ~ Overall Proposed to Pond ilf1Pt)~yr Hydrograph type = scs Storm frequency (yrs) = 25 Drainage area (ac) = 3054.570 Basin Slope (%) = n/a Tc method = User Total precip. (in) = 2.00 Storm duration (hrs) = 24 Monday, Nov 24 2025 Peak discharge (cfs) = 340.26 Time interval (min) = 1 Curve number (CN) = 76 Hydraulic length (ft) = n/a Time of cone. (min) = 116 Storm Distribution = Type II Shape factor = 484 Hydrograph Volume= 4,587,142 (cuft); 105.306 (acft) Runoff Hydrograph 25-yr frequency Q (cfs) Q (cfs) 350.00 --.------.-----r-----r------r------r---~----,-----..------~ 350.00 300.00 250.00 150.00 100.00 0.00 ________ _,, __ ....,... __ Jt.L-__ __L_ __ --'---~--___J_--"""""'---__J_ 0.00 30.0 0.0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 Time (hrs) -Runoff Hyd -Qp = 340.26 (cfs) Hydrology Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Overall Proposed to Pond 100-yr Hydrograph type = scs Storm frequency (yrs) = 100 Drainage area (ac) = 3054.570 Basin Slope (%) = n/a Tc method = User Total precip. (in) = 2.40 Storm duration (hrs) = 24 Peak discharge (cfs) Time interval (min) Curve number (CN) Hydraulic length (ft) Time of cone. (min) Storm Distribution Shape factor Monday, Nov 24 2025 = 570.08 = 1 = 76 = n/a = 116 = Type II = 484 Hydrograph Volume= 7,038,914 (cuft); 161.591 (acft) Runoff Hydrograph Q (cfs) 640.00 560.00 480.00 400.00 320.00 240.00 100-yr frequency Q (cfs) ~--~---.------r-------r------.-----,-----,------,-.---~--~ 640.00 0. 00 -------~==-...i...-----------'----------'----_____l_-----L----=:-. __ ~ 0. 00 0.0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 Time (hrs) -Runoff Hyd -Op= 570.08 (cfs) -Outflow Hyd * [□]]]]] Req. Stor = 1,064,197 (cuft) * * Estimated HYDRAULIC COMPUTATIONS DetentionforEastofcR114.txt Lake springs Ranch 7 /21/15 change in Flow from Irrigation Pond Area Basin output Pond Name ...................... . Distribution Type .............. . Frequency Type ................. . Area ........................... . Peak Inflow .................... . Peak outflow ................... . Runoff ......................... . Runoff Volume .................. . storage volume ................. . Maximum storage Elevation ...... . Type II 1 year 169.4409 ac 61. 9714 cfs _ 48.8096 cfs +->;;'x•IO flow 0.4681 in 287896.4816 ft3 51890.4377 ft3 0.0000 ft Page 1 Lake Springs Ranch 7/21/15 CR 114 Runoff crossing 36inch-culvert.txt culvert calculator All calculator output should be verified prior to design use Entered Data: shape .......................... . Number of Barrels .............. . solving for ................... .. chart Number ................... . scale Number ................... . chart Description .............. . scale Description .............. . overtoppi ng .................... . Flowrate ....................... . Manning's n ................... .. Roadway Elevation .............. . Inlet Elevation ................ . outlet Elevation ............... . Diameter ....................... . Length ......................... . Entrance Loss .................. . Tailwater ...................... . computed Results: Headwater ...................... . slope . , ............. , , ......... . Velocity ....................... . Messages: computing Inlet control headwater. solving Inlet Equation 26. solving Inlet Equation 28. Headwater: 6952.4079 ft circular 1 Headwater 2 2 CORRUGATED METAL PIPE CULVERT MITERED TO CONFORM TO SLOPE Off 62. 0000 cfs 0.0100 6953.0000 ft 6946. 3300 ft 6930. 5000 ft 36.0000 in 125.0000 ft 0.1000 2. 5000 ft 6952.4079 ft Inlet control 0.1266 ft/ft 34.1405 fps cte. 114. Page 1 Weir Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. <Name> Trapezoidal Weir Crest Bottom Length {ft) Total Depth (ft) Side Slope (z: 1) Calculations Weir Coeff. Cw Compute by: Known Q (cfs) Depth {ft) 0 10 --Weir 20 = Sharp = 87.00 = 1.50 = 4.00 = 3.10 Known Q = 520.17 30 --w.s. <Name> 40 50 60 Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Top Width (ft) 70 80 90 Monday, Nov 24 2025 = 1.50 = 520.17 = 139.50 = 3.73 = 99.00 Depth (ft) 100 110 120 Length {ft)