The URL can be used to link to this page

Home My WebLink AboutDrainage Report 04.09.2021April09,2021 Garfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 816001 RE Beaton Residence Drainage Report JVA Job No. 3402c Dear Community Development Staff: The following Drainage Report and attached drainage map have been prepared for the Beaton Residence at 124 Juniper Drive in Garfield County, Colorado. The drainage report and drainage map have been produced in accordance with the Garfield County "Land Use and Development Code" and comply with provisions thereof. It is our understanding that the information provided herein meets all requirements of the Garfield County Grading Permit. Please contact us if you have any questions regarding this submission. Sincerely, JVA,Inc. 789 ;: aIa J.R Spung, P Project Manager '1 Beaton Residence -Drainage Report i TasLE or CoTTENTS S¡croN I - lNrnooucloN GrNrRRr LOCRION ANO DTSCRIPTION PRoposro Pno.lrcr SrcloN 2 - ExrslNc Slrr luronvATloN MnloR DRRrNncr BnstN DrscRlptloN .. Srre DRRrunor ANo ExlsrtNo F¡clt-rles SecrroN 3 - Pnoposro (Drvrtoero) Srr lNronuATloN DRRINROE DTSICN CRITTRIN HvoRot-ocrc Mrruoo ANo DrslcN SroRu FRrourNclrs Pnoposro Sre BnslNs Ru Norr ANo STonUWATER Quntlry ENHRNcrurNr/DnrNrloN FRcltlTlEs .......... MRrutruRNCE............ SrcroN 4 - CoNclustoNs SrcroN 5 - RrrrnrNcEs.......... AppeNorx A - Flcunrs AND RereRrNcrs Srre VtctNrrv Mnp Wrs SotL Sunvev - HvonRullc Solt Gnoup PrRcoLnroN SEcloN or ExlsrlNo GeorecH RrpoRr FEMA FIRM FrouRr I - Hlsronlc DnntNRoe MRP Frounr 2 - Drvrtopeo DRRlNnor MnP ApprNorx B - Hvonnuuc CnLcuLATIoNS I I I 2 2 2 3 3 3 3 4 4 5 6 Beaton Residence -Drainage Report l1 S¡cnoru 1 - lNTRoDUcTtoN GrNrnnl LocRloN ANo DrscRlPloN The property owner proposes to develop a ne\ry residence at 124 Juniper Drive, Lot RRl, Elk Springs, Filing 8, Phase 2, Los Amigos Ranch P.U.D. The 47.11-acre site (0.986 proposed acres oi dirtorbutr."; i* in Section 36, Township 6 South, Range 89 'West, of the 6ú P.M., Garfield County, State of Colorado. The subject property is fully undeveloped except for Juniper Drive. The primary pu{pose of this drainage report is to address the proposed runoff information and to address water quality enhancement facilities at the proposed development. Reference is made to the attached "Figure 2 - Developed Drainage Map." PRoposrD PRoJECT The proposed project will consist of constructing a new building, driveway, storm drainage, utilities, patios, and surrounding landscaping. A new driveway will connect the proposed building to Juniper Drive. Utility connections will be serviced from Juniper Drive to the building along the driveway. An Onsite'Wastewater treatment system will be utilized. Beaton Residence -Drainage Report 1 S¡cr¡on 2 - HIsToRtc DnaINAGE Mnron DRRTNRcT BnslN DrscRtrlloN The site is located in the Roaring Fork River Basin. According to the FEMA Flood Insurance Rate Map Panel Number 080205 1465 B, dated January 3"1, 1986, the sjte is located in Zone C which is designated as areas of minimal flooding (outside the 100-yr floodplain). Copies of the referenced flood map that depict the site location are included in Appendix A. Srrr DnnlNAGE ANo ExlslNc FRclurlrs The existing site is entirely undeveloped except for Juniper Drive along the east side of the property in a utility and access easement. The site currently has an unpaved drive for access to the Building Envelope with 2 storm drain culverts, with one at the access at Juniper Drive, and one at the low point of the drive. The site is bound in all directions with adjacent properties and common areas for the Elk Springs development. Overall, the site slopes from north to south, with a small portion that flows east along Juniper Drive. There are only a few storm drains culverts on site. The historic site was previously undeveloped with mostly type B soils, with small portions of A and C. All proposed improvements are in the areas of type B soils. There are no natural hazardareas in the vicinity of the proposed site. These natural areas include snow slide, avalanche, mudslide, and rockslide. Beaton Residence -Drainage Report 2 Srcnoru 3 - PRoposED (DrvrLoPED) DnaINAGE DRRTNRcT DrsrcN CnrrRrR The proposed grading and storm drainage facilities for the project are designed to comply with the Garfield County Land Use and Development Code. HvoRor-ooc MrrHoo ANo DrslcN Sronu FRrQurNclrs V/ith the proposed work, the area disturbed by grading is less than 1 acre and the proposed improvements will not change drainage patterns with regard to adjacent properties, wetlands or water bodies. However, with the addition of over 10,000 square feet of impervious surface area with the building and driveway, the Stormwater Run-off standards for the Garfield County Land Use and Development Code are followed. Most of the added impervious areas (the driveway) are considered not directly connected impervious areas, however the directly connected impervious areas (building and patios) will have treatment captured and conveyed to a permanent detention dry well to be treated and released for the 25-yr storm. Runoff and detention calculations have been provided. These calculations are included in Appendix B of this report. PnoposrD SlrE BnstNs As shown on the attached Figure 2 - Developed Drainage Map, the entire site was analyzed to determine the proposed runoff routing from the developed site area. The proposed site was divided into six basins. Drainage Basin A consists of the building and patio areas. These areas will be conveyed to the dry well at the south side of the building to be treated for detention for the 25-yr storm. Drainage Basin B consists of the northwest side of the building and upstream contributing area. This area is graded to flow in a swale around the building and discharge to the southwest of the building. Drainage Basin C consists of the northeast side of the building along the driveway roundabout and contributing areas upstream. This area is routed to the east side of the building, to a drainage pan to discharge to the south east of the building. Drainage Basin D consists of the southeast portion of the building and patios that is surface drained to the south, unable to be captured in the dry well. Drainage Basin E consists the areas of improvement along the driveway. These areas surface drain to the south east along the driveway as they currently do, without changing drainage patterns. Beaton Residence -Drainage Report J RuNorr ANo DrrrNnoN Fncllrlrs A large portion of the impervious area improvements are for the driveway arca. Because of the topography the driveway crosses, this impervious area cannot be captured in the proposed dry well. The largely directly connected portions of impervious areas, consisting of the building and patios will be conveyed to the dry well for detention of the 25-yr storm. Storm events larger than that will overflow and convey to the south. The calculated25-yr volume for the treated basins is 475 cubic ft (.011 acre-feet). The target design capture volume is 712.85 cubic feet which accounts for a 1.5 factor of safety. The drywell provides a treatment volume of 711.5 cubic feet. The drywell is designed for an estimated drain down time of 69.9 hours. The calculations for basin imperviousness and detention are provided in Appendix B of this report The areas upstream of the building that will be conveyed around the building (Basins B and C) with be designed to convey the 100-yr without property damage. Calculations for the generated flows and capacity of swales and pans are provided in Appendix B of this report. MnrrurrNRNcr The homeowner will maintain the dry well per the following requirements Required Action Maintenance Objective Frequency of Action Inspection Monitor water level and accumulation of sediments in wells. Annually and following all rainfall events >0.25 inches. Sediment/ debris removal Dispose of sediment, debris/trash, and any other waste material removed from a dry well at suitable disposal sites and in compliance with local, state, and federal waste resulations. Once per year or when needed to promote drainage. Evaluation Routinely evaluate the drain-down time of the dry well to ensure the maximum time of 40 hours is not being exceeded. If drain-down times are exceeding the maximum, drain the dry well via pumping and clean out the percolation area (the percolation barrel may be jetted to remove sediment accumulated in perforations). Consider drilling additional perforations in the barrel. If slow drainage persists, the system may need to be replaced. Routinely following rain events Beaton Residence -Drainage Report 4 S¡cno¡¡ 3 - CoNcLUstoNs Historic drainage patterns regarding adjacent properties and waterways will be maintained. A drywell will be implemented for Drainage Basin A to provide detention for the 25-yr storm. The remaining not directly connected impervious area improvements will surface drain and maintain existing drainage patterns. The recommendations of this report are in conformance with all applicable storm drainage regulations. Calculations, a vicinity map, and other reference materials used are attached in the Appendices. Beaton Residence -Drainage Report 5 2. S¡cr¡ox 4 - REFERENcES 1. "Land Use and Development Code", Garfïeld County, Last Amended October 19,2020 "L]rban Storm Drainage Criteria Manual," Urban Drainage and Flood Control District, Revised Edition 2018. Beaton Residence -Drainage Report 6 ApPENDIX A - FIOuRES AND REFERENCES Regional Vicinity Map ô* ft!, 1 SllzrEriFrror Ç o*6o $**, II II Q no.rtnt r.ør n nrrt &n Local Vicinity MaP Section 36, Township 6 South, Range 89'West, of the 6th P.M., Garfield County, State of Colorado , h g Ìh Þ Soll Map-Rlfle Area, Colorado, PartB of Gãlield 6nd Meea Counlle¡ *aú gm g)æám g Ð lgll 3'þ2Û4Ë'N E a E E I F Þ p H F Ë ç F Ð B ?u ø tîN w 84CN ßD È b å w Nrtur¡l Rraourocr Con¡e¡v¡tlon 8erylco sm m s4t@ s4m s4g w i b å M¡psøþ: t:5,080¡f prlrlÊd mAbn&6p6(1f"x8,1)dì€d" --l!l@50 50 10 200 3mN A Ð lfapprDtêdoñ; llhþ l\4.tohr Conlr@rdh&t: WGS84 Egêüc8: UD4ørP 13N WGS84 sg wob Soll gurvsy Natlonal CoopÊratlvo Soll Surv6y 41612021 Pâge 1 ol 3 Nts Nltural Resources Conservation Seruice Soil Map-Riflê Area, Colorado, Parts of Garf¡eld ând Mesa Counties Web Soil Suruey Nat¡onal Cooperative Soil Suruey 4t512021 Page 2 of 3 MAP LEGEND MAP INFORMATION The soil surueys thal comprise your AOI were mapped at 1:24,0OO. Warning: Soil Map may nol be valid at this scale. Enlargement of maps bèyond the scale of mapping can cause misundeßtanding of the detail of mapp¡ng and accuracy of soil l¡ne placemenl. The mâps do not show the small ãreas of contraslìng soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conseruation Seruice Web Soll Suruey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Suruey are based on the Web Merætor projection, which preserves d¡rect¡on and shape but distorts d¡stance and area. A projection that preserves area, such as lhe Albers equal-areã conic projection, should be used if more accurate câlculations of dislance or area arè required. This product is generated from the USDA-NRCS certilied data as of the version dâte(s) llsled below Soil Suruey Area: Rifle Area, Colorado, Parts of Gârlìeld and Mesa Counlies SurueyArea Data: Version'13, Jun 5,2020 so¡l map units are labeled (as space allows) lor map scales 1:50,000 or larger. Date(s) aerial images were photographed: Sep 24, 201 s-Nov 2,20'15 The orthophoto or other base map on which the soil lines were compiled and digitized probably d¡fiers from the background imâgery displayed on these maps. As a result, some minor shifling of map unit boundaries may be ev¡dent. Ar.r ot lnlrr..l (Aoll t] Arsaotlnter€Bl(AOl) Sollg ff Soll Mtp Unlt Polygonß H, goll Map Unlt LlnêB t Soll Msp unlt Polnt Blowoul Borgw Plt glåy Epot Clorsd Doprocslon gravål Plt onvelly gpot Lsndfll Låva Flow MorEh or swamp Mlne or Qu¿rry P0f6nn¡al Water Rook Outcrop Satlne Spot 96ndy Spot Ssvsroly Eroded Spot Slnkh0le glldt or Slip Sodlc Spot üt SpollArss ú gtony spol & Vsryglenygpol V wetEpot I Olhet .. Sp0clol L,ns Fgåtur€s lïlrLr F..lr¡r.¡ /\r gtrsams and Cânalt Ìnr¡porlrllon {-H ß¡ll¡ e lntonlsts Hlghwayg * UsRoutos | . Major Roads , Local Roads Eackground I AerialPhotography (9 e x ¡{ 0 Å. {¡¡ * o o + ; + þ ø Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Map Unit Legend lvlap Unit Symbol ilap Unit Name Acres in AOI Percent ofAOl 2 Arle-Ansari-Rock outcrop complex, 12 to 65 percent slopes 44.0 64.1o/o 44 Morval loam, 3 to 12 percent slopes 2.1 3.0% 67 Toniorthents-Rock outcrop complex, steep 22.6 32.9Yo Totals for Area of lnterest 68.7 100.0% USDA{Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 41512021 Page 3 of 3 Map Unit Description: Arle-Ansari-Rock outcrop complex, l2-to 65 percent slopes--Rifle Area, Colorado, Parts of Garfield and Mesa Counties Rifle Area, Colorado, Parts of Garfield and Mesa Gounties 2-Arle-Ansar¡-Rock outcrop complex, 12 to 65 percent slopes Map Unit Setting National map unit symbol: inxh Elevation: 5,500 to 7,500 feet Farmland classification: Not prime farmland Map Unit Composition Arle and similar soi/s:45 percent Ansari and similar so/s:35 percent Rock outcrop; 20 percent Estimates are based on obse¡vations, descriptions, and transects of the mapunit. Description of Arle Setting La ndform : Alluvial fans, mountainsides La n dfo rm po siti on (th ree-d i m e n sio n al ) : Mou ntai nfl an k Down-slope shape: Convex Across-s/ope shape: Convex Parent material: Alluvium derived from sandstone and shale Typical profile H1 - 0 to 10 inchesi very stony loam H2 - 10 to 32 inches.' very stony loam H3 - 32 to 36 inches; weathered bedrock PropeÉies and qualities S/ope; 12 to 65 percent Depth to restrictive feature: 20lo 4O inches to paralithic bedrock Drainage c/ass.' Well drained Runorïclass: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water fable; More than 80 inches Frequency of f/oodrng; None Frequency of ponding: None Calcium carbonate, maximum content: l0 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity: Very low (about 2.2 inches) lnterpretive groups Land capabil ity cla ssification (i rrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Ecological sife; R048AY303CO USDAz-Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 41512021 Page '1 of 3 Map Unit Description: Arle-Ansari-Rock outcrop complex, '12 to 65 percent slopes--Rifle Area, Colorado, Parts of Garfield and Mesa Counties Hydric sol/ raftng: No Description of Ansari Setting Landform: Alluvial fans, mountainsides Landform position (three-dimensional) : Mountainflank Down-slope shape: Convex Across-s/op e sh ape : Convex Parent material: Alluvium derived from sandstone and shale Typical profile H1 - 0 to 10 inches.' loam H2 - 10 to 1B inches: stony loam H3 - 18 to 22 inches.' unweathered bedrock Properties and qualities S/ope; 12to 65 percent Depth to restrictive feature: 10 to 20 inches to lithic bedrock Drainage c/ass: Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of f/oodrng: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity:Yery low (about 2.2 inches) lnterpretive groups La nd capability cl assification (i rrigated): None specified Land capability classification (nonirrigated) : 7e Hydrologic Soil Group: D Ecologicalsr|e: R048AY300CO - Loamy Breaks Hydric sorT rafing; No Description of Rock Outcrop Setting Landform : Mountainsides Landform position (three-dimensional) : Free face Down-slope shape : Convex Across-s/ope shape: Convex Typical profile H1 - 0 to 60 inches.' unweathered bedrock Properties and qualities S/ope; 15 to 65 percent Depth to restrictive feature:0 inches to paralithic bedrock Runoff class; Very high Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 inThr) HE Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 41512021 Page 2 of 3 Map Unit Description: Arle-Ansari-Rock outcrop complex, 12 to 65 percent slopes--Rifle Area, Colorado, Parts of Garfield and Mesa Counties Available water capacity:Very low (about 0.0 inches) lnterpretive groups Land capability classification (irrigated): None specif¡ed Land capability classification (nonirrigafed); 8s Hydric soi/ raftng: No Data Source Information Soil Survey Area: Survey Area Data Rifle Area, Colorado, Parts of Garfield and Mesa Counties Version 13, Jun 5,2020 USDAt Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 41512021 Page 3 of 3 Map Unit Description: Morval loam, 3 to 12 percent slopes--Rifle Area, Colorado, Parts of Garfield and Mesa Counties Rifle Area, Colorado, Parts of Garfield and Mesa Counties 44-Morval loam, 3 to 12 percent slopes Map Unit Setting National map unit symbol: inYc Elevation: 6,500 to 8,000 feet Farmland classification: Not prime farmland Map Unit Composition Morval and similar so/s; 85 percent Esflmafes are based on obse¡vations, descriptions, and transects of the mapunit. Description of Morval Setting Landform: Valley sides, mesas Down-slope shape: Convex, linear ,4cross-s/op e shape: Convex, linear Parent material: Reworked alluvium derived from sandstone and/or reworked alluvium derived from basalt Typical profile H1 -0 foSinches: loam H2 - 5 to 17 inches: clay loam H3 - 17 to 27 inches; stonY claY loam H4 - 27 to 60 inches: stonY loam Properties and qualities S/ope; 3lo 12 percent Depth to restrictive feature: More than 80 inches Drainage c/ass.' Well drained Runoff class; High Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.60 in/hr) Depth to water fable; More than 80 inches Frequency of f/oodtng: None Frequency of ponding: None Calci u m carbon ate, m aximum content: 25 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacr'f¡ Moderate (about 8.4 inches) lnterpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: C Ecological sde: R048AY292CO USDAY Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4t5t2021 Page 1 of2 Map Unit Description: Morval loam, 3 to 12 percent slopes--Rifle Area, Colorado, Parts of Garfield and Mesa Counties Hydric so,7 raf,ng.' No Data Source lnformation Soil Survey Area: Survey Area Data Rifle Area, Colorado, Parts of Garfield and Mesa Counties Version 13, Jun 5,2020 SE Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4t5t2021 Page 2 ot 2 Map Unit Description: Torriorthents-Rock outcrop complex, steep--Rifle Area, Colorado, PaÉs of Garfield and Mesa Counties Rifle Area, Colorado, Parts of Garfield and Mesa Counties G7-Torriorthents-Rock outcrop com plex, steep Map Unit Setting National map unit symbol: jnzS Elevation: 5,800 to 8,500 feet Mean annual precipitation: 10 to 15 inches Mean annual air temperature: 39 to 46 degrees F Frost-free period: 80 to 105 days Farmland classification: Not prime farmland Map Unit Composition Torriorthents, steep, and similar so/s;60 percent Rock outcrop, sfeep.' 25 percent Esfimafes are based on obseruations, descrìptions, and transects of the mapunit. Description of Torriorthents, Steep Setting Landform : Mountai nsides La n dform po siti on (two-d i me n sio n a l) : Footslope Landform position (three-dimensional) : Mountainflank, base slope Down-slope shape: Concave, convex Across-s/ope shape : Concave, convex Parent material: Stony, basaltic alluvium derived from sandstone and shale Typical profile H1 - 0 to 4 inches: variable H2 - 4 to 30 inches; fine sandy loam H3 - 30 to 34 inches.' unweathered bedrock Properties and qualities S/ope: 15 to 70 percent Depth to restrictive feature:4 to 30 inches to lithic bedrock Drainage c/ass: Well drained Runoff class; High Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water fable; More than 80 inches Frequency of f/oodrng: None Frequency of pondrng: None Calcium carbonate, maximum content:5 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity: Very low (about 2.4 inches) lnterpretive groups Land capability classification (irrigated): None specified USDAY Natural Resources Gonservation Service Web Soil Survey National Cooperative Soil Survey 4t5t2021 Page 1 ot 2 Map Unit Description: Torriorthents-Rock outcrop complex, steep--Rifle Area, Colorado, Parts of Garfield and Mesa Counties Land capability classification (nonirrigated): 7e Hydrologic Soil Group: D Hydric sol/ rafrng; No Description of Rock Outcrop, Steep Setting Landform : Mountainsides Landform position (th ree-dime n sion al) : Free face Down-slope shape: Convex Across-s/ope shape: Convex Typical profile H1 - 0 to 60 inches; unweathered bedrock Properties and qualities Slope: 15 to 70 percent Depth to restrictive feature:0 inches to paralithic bedrock Runoff class; Very high Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Available water capacity: Very low (about 0.0 inches) lnterpretive groups Land capability classification (i rrigated); None specified Land capability classification (nonirrigafed): 8s Hydric so/ rafing: No Data Source Information Soil Survey Area: Survey Area Data Rifle Area, Colorado, Parts of Garfield and Mesa Counties Version 13, Jun 5,2020 USDA - Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 41512021 Page 2 of 2 - 11- can be frost susceptible which could increase the risk of post construction movement' The topsoil and any wet subgrade in drainage areas are unstable for pavement suppor:t' In general, the topsoil should be removed. In any soft and wet areas, subgrade improvernent be partial stripping and placernent of a geotextile and reinforcement mat (such as Tensar ss-1 geogrid) and additionai sub-base aggregate couid be used' The geotextile and reinforcement mat shouid be placed according to the manufacturer's specifications' The entire subgrade and any sub-base stabilized areas should be proof rolled with a heavily loaded wheel vehicle and soft deflecting areas stabilized before placing the pavement base materials. PERCOLATION TESTING Percolation tests were conducted on January 7, B and 9 to evaluate the feasibility of in-filtrationqepticdisposalsystemsatthesite.Theresultsofthepercolationtestsareshown on Table tr. Shallow Percolation holes were dug adjacent to about half of the deeper expioratory pits at locations as shown on Fig.1' The test holes (nominal 12 inch diameter by l|inch deep) r,vere hand dug at the bottom of shallow þackhoe pits and were soaked with water one day prior to testing. The soils exposed inthe percolation lioles are similar to those exposed in the adjacent exploratory pits shown on Figs 2 and 3 ' The percolation test rates varied from l i to 40 minutes per inch with an overall average rate of 74 minutes per inch. conr¡entional infiltration septic disposal systems appear feasible for the development. Mounding or other engineered systems may be required in shall'ow basalt rock areas LIMITATIONS This repod has been prepared acsording t0 generally accepted geotechnical engineering princlples and practices in this area at this time' we make no other warranty either expressed or implied. The conclusions and recommendations submitted in this H-P GEOTECH 2930 31 32 5 WE 34 3 1l ¡ t4 ôÉc 2 ZqNEç þNE 13 t2 r'w¡lglÞåç ffi-?¿#Ã:&ail,w&tßë,ffi :...:,:UEPI.:t: ãdlÞ l¡ 14 !,|J lÀt4 \r ¿gG6l fxlt^tat¡o! of zoNt o6rBArl(d6 ^árfX@ tnil ru000 usl,¡iltff ¡^T¡ til CARTIELD COUNTY, ço[,oRADo ßMNCOßOR^ÎfD Aß[Æ) PANEI t4EÉ Of I90ll 0t020¡ r4t6 ¡ tt? ltvßfo ,AilUÁiY 3, r0¡ô r---àt",¡6¡.t&L-II-dÈIt-^^,läåËlE b:tÃE19 :lå !Ir ä"-a :á>Ø3Fd:?EfıIovıovzomz:âãzc,,íEEËI ì:lr,l;nt:Ð"åìtIû¡==È! "là a 44 á.9 '9 t9 C *3 Aã e 8a ãg cPP=aÀ:@-:t-(ì,fo-+LT,JoãoBEATON RESIDENCE124 JUNIPER DRIVEGO TO GLOBAL PARAMETERSTo¡>;l\l ELK SPHI¡IGS FILING 8 PHASE Ictr[,ilr4cN ARtALand+Shelte'e70.s3.020i rô@àd,rd!hnú.d.g:j:@GOTOGLOA{ PÀRAMETERIMay5h,2021-^ao'-^"""-o$'a"""AaDÉ,UuHz==,UJE<c¡oEafrfÉgäzz ûoÐokçol!Nn6FËoo^ : oaEræÐ 8ÀsN 0Es6[^1d.S = 100-n lüF CGFfrotNlèóJob Site:124 JUNIPER ORIVE,GLENWOODSPRINGS. CO 81DEVELOPED DRAINAIIVAPShêet Numbêr:FIG 2 AppENDrx B - HvoRAULtc CetcutATtoNs i f¡r,rr¡t I t/f i tt (, JVA lncorporated 214 Ûlh Street, S 210 Glenwood Springs, CO 81601 Ph: (970) 404 3100 JVA Office: Version 2O2O_X| : 3l8l2Ù2'l (,i1tr ll¡irrr,ri.i , ìi,1 tl rt"l,l Project lnformatìon: Job Name: Job Number: Date: Designed by: Municipality: '; 41812021 SoilType: re L.i {:Êl(r1 Runoff Calculations: Minor Design Storm: i Major Design Storm: : 25 100 year year Detention Calculations: Minor Storm Detention: i 2 Major Storm Detention: ; 100 Detention Volume by: , Rational Allowable Release Rates (if applÍcable): year year plus plus Enter WQCV 0 0 %WQCV %WQCV cf acres (GB, PP, PLD, SFB, EDB,eic.) Max release rate 'l cfs / acre?Site Area: Enter Offsite flows to bypass site (these will be added to the allowable release rates) Qminor =cfs (bypass flows) e100 = re cfs (bypass flows) cfsQminor allow =t;l,r' I ir \//'il ltl cfsQ100allow = Rainfall Data lnformation: Enter City, Town, or County: Do you need to Calc Pl? iì,,tL.,i!i i.,ilil lii/ Frequency of Design Event One Hour Point Rainfall Pl 2y¡ 5yr 25yr 100 vr 0.45 0.61 0.94 1.28 tn in in in Ru noff Coefficient Ca lc u lations : Use MHFD Equations? Yes lntensity Duration Values: l-D-F , GarfieldCountylDF 3402c - Rational Calculations INTRO Page 1 of 7 214 6th Sreei S 210 Glenw@d Spnngs, CO 81601 Phi {S70) 4ü 3100 Beaton Residence Histor¡c Runoff Co€fflcient & T¡me of Concentration Calculatlons Minor De6ign Slom: Ma¡or De6ign Slom: SoilTFe: t....Fl llnnll--E-l DaE: 4421 BT EJK l(%) =100ya 90%s0%40%25yo 21,2%| (%)n¡lial ov€lånd Tim€ (t¡: 60)ON Bas¡¿Desisn lsn * (6r)(sr)(sr)(st)(sr)(sO lsf)(s0 t"Á) c2 c5 c25 c100 \%l (mìn) Lenqlh (fr)l%) Type ûl Lând sudace K (rps) q (min) Toþl L€nglh fi) t=(L/180)i 10 (m¡n.) H1 15,861 2,036,299 2,052.160 17.11 2.4%0.01 0.02 0.0E 0.4 921 4.4 1115 4.2%15 1.3 4.6 49.0 2096 21.6 21.6 o 0.00 20 0 10.0 0 0_00 20 0 10.0 0 0.00 0 10.0 0 0.00 0 10.0 TOTAL SITE 15,861 0 0 0 0 0 2,036,2S9 0 2,052,160 47.11 2.ø%0.01 0.02 0.08 o.& Basln Deslgn (tc) c2 c5 c25 c100 2 25 100 {âc) a2 o5 o25 o100 H1 21,6 0.01 o.o2 o.0a 0.4 0.s 1.48 2.052,160 17.11 0.57 1.21 s.07 66.ô0 0 0 0 0.00 0 0 0 0.00 0 0 0 0_00 0 0 0 00n 2,052,1ô0 47.11 0.57 1.21 9.07 66.60TOT& SITE g02c - Raüonâl Câlcúlâtlons Pãse 2 of 7 JVA lncorpo¡ated 214 8th Street, S 210 Glenwood Springs, CO 81601 Ph: (970) 404 31 00 Beaton Residence Composite Runoff Coefficient Calculations Localion: Minor Design Storm: Major Design Storm: Soil Type: Job Name: Bealon Res¡dence Job Number: 3402c Dale'. 418121 By: EJK CA l00yr = 0.78¡ + 0.11 CB l00yr = 0.47¡ + 0.426 CC/D 100yr = 0.41i + 0.484) 25 100 B Basin Desion Data r(%)=100%90%90%40%25%250/.2%2%t(%)Runoff Coeffs Basin Name Design Po¡nt Apau"a slreets (sr) &¡u""/" on" (sf) Arool (sr) \rav.t (sr) Aptygno (sr) Arn. ,urt (s0 4,"""p" so¡¡) (sr) (B A"*p" (C/D so¡l) (sr) Ato,u, (sr) Ator"r (ac) lmp ("/")c2 c5 c25 c1 00 1 1.O24 6,385 1,513 8,926 o.20 7 5.'lo/ı 0.60 0.63 o.67 0.78 B 2 26,343 26,343 0.60 2.0o/o 0.01 0.01 0.07 0.44 3 2,733 358 53 10,187 13,331 0.31 24.8%0.16 0.19 o.26 0.54 D 4 235 191 1,282 1,708 0.04 23.9%0.16 0.18 o.25 0.54 E 5 11,459 6,1 36 17,595 0.40 65.8%0.52 0.55 0.59 o.74 ÏOÏAL BASINS 14,192 1,621 6,629 0 0 0 45,46'l 0 67,903 1.56 33.2o/i 0.23 o.26 0.33 0.58 DISTURBACE AREA 14J92 1,621 6,629 0 0 o 20,505 0 42,947 0.99 51.3o/o 0.38 0.42 o.47 0.67 TOTAL SITE 29,935 1,621 6,629 0 0 0 2,013,975 0 2,052,160 47.11 3.8%0.o2 0.02 0.09 0.44 3402c - Rational Calculations Developed C Page 3 of 7 Beaton Residence Time of Concentration Calculations Location: Garfield County JVA lncorporated 214 8th Street, S 210 Glenwood Springs, CO 81601 Ph: (970) 404 31 00 Job Name: Beaton Residence Job Number: 3402c Date: 418121 By: EJK Minor Design Stom: Major Design Stom: Soil Type: 25 100 B Sub-Basin Data lnit¡al Overland Time (t)TravelTime (o tr=Lensth/(Velocity x 60)Ç Comp tc Urbanized Check ON F¡nal Bas¡n Name Des¡gn Point (ac)c5 Upper mqst Length (ft) Slope (%l q (min) Length (ft)Slope (%)Type of Land Surface c"Velocity (rps) t{ (min) Time of Conc t+t{=t Total Length (ft) Ç=(U180)+ 10 (min)Mint A 0.20 0.63 85 1.O%8.0 65 2.Oo/D Paved areas & shallow 20 2.8 o.4 8.3 150 10.8 8.3 B 2 0.60 0.01 393 11.6%17.5 167 2.7%Grassed wateruay 15 2.5 1.1 't8.6 560 13.1 13.1 c â 0.31 0.r 9 413 10.5'/,15.5 43 1.50/o Paved areas & shallow naverl ewalac 20 2.5 0.3 15.8 456 12.5 12.5 D 4 0.04 0,18 48 16.6%4.6 Paved areas & shallow 20 0.0 0.0 4.6 48 10.3 5.0 E 5 0.40 0.55 100 8.8%4.9 Paved areas & shallow naved swales 20 0.0 0.0 4.9 '100 r0.6 5.0 3402c - Rational Calculat¡ons Developed Tc Page 4 ol 7 JVA lncorporsted 214 8th Street. S 2l clenwood Springs, Phì (970) 404 3100 Job Namer Bêaton Residencs Job Numbei 3402c Dale: 418121 By EJK 0 co 81601 Beaton Residence Designstorm: llo-'d-ãl Developed StoÌm Runoff Calculat¡ons Poin Hour Ralnfal¡ (P1) : 1,2a z '6 .5 È .s) o o u Ê d .ç E E ø F ! à ñs tñ= .e. o .g ìIu _9àÀıxq È.q ı!E EF Ê.z '|0.20 0.78 4.30 0.16 5.42 0.86 8.30 016 5.42 0.86 Dry Well B 2 0_60 o.u 13.10 0.26 1.12 13.10 0.26 4.26 1.12 swale C 3 0.31 o.54 't2.50 4.37 0.73 12.50 0.17 4.37 Concrete Pan D 4 0.04 0.54 5.00 0.02 6.58 0.14 5.00 0.02 6.58 o.14 E 5 0.40 0.74 5.00 0.30 6.58 1.95 5.00 0.30 6.58 1.95 3402c - Ratìonal Calculat¡ons Qt00 Pego 5 of 7 JVA lhcorÞoEted 214 8th Street, S 210 Glenwæd Springs, co 81601 Ph: (S70) 404 3100 Job Nam€: Beáton Residence Job Numbeï 3402c Dale: 418121 By: EJK Beaton Residence oesign storm ì l--Y*l DeveloÞed Storm Runoff Calculat¡ons Po¡nt Hour Ralnfall (Pr) : 0.94 E z 'ı .E À .9 ê E o d E o E ı o ı F .E .g ¿' :-ıñs thl ä! c d I II .gàÀı €¡1 'ı I E EF g z 0.20 0.67 8.30 0.14 0_s 8.30 o.14 4.13 0.56 Dry Well B 2 0.60 0.07 13,10 0.M 3.24 o.14 1 3.10 0.04 3.24 0.14 Swde c 3 0.31 o.26 12.50 0.08 3.33 o.26 12.50 0.08 3.33 o.26 Concrete Pan D 4 0.04 o.25 5.00 0.01 5.O2 0.05 500 0_01 5.O2 0.05 E 5 0.40 0.59 5.00 o.24 5.02 1.20 5.00 0.24 5.02 1.20 3402c - Rational Calculations Q M¡noT Page 6 of 7 F TABIF BIJ]I t)FR MHFDDetentìon, Ve6¡on 4.04 (Februdry 2021) aüln E¡.mpleZone Confi guraüon (Rer€ntlon Pond)$aS'SæS s9e teruth !lÊ&!sÊd-¡!l!rE¡l¡e! Sled€d BMP TW wateBhed Areå wat€Ekd Lendh wateßh€d t€4th to CenÍold wåteBhed soæ Wat€Ekd ImËúou5æss ÞrcenÞg€ tbddqic Sl Group A PerenÞge tlìdrclqic SIGÌoúp B Peræd¿æ Hydrclqic 9l Gdtr C/D larst WQd DEhlime W¿ter Q@lity aÉure volure (wQCq Excess Utun RudVolure (EURV) 2-r RunúVdure (Pl = 0-45 in.) 5-y RuffiVoluæ (P1 = 0.ó1 in.) 10r RlnotrVolure (Pl = 1.33 ¡r.) 25-y RuMvdume (P1 = 0.q ¡n.) 5Gr Rudvolum (P1 = LB ¡¡.) 1@rRuff Vdúre (Pl = 1.28¡n.) s@r Rutrvdúm (Pl = 3.14 ¡n.) Apprcnftþ 2-F Detedion Vdum Apprciæt€ 5-y Deteftion vdure Approitut€ lGF Deteúion vdum Aprcnmt€ 25-r DeteûiM vdure Approtmt€ 50r Deteilion vdure Aæroiæt€ 1&r Deteillon vdure t¿ef¡!r¿Q¡sü!¿!i5¡!-6erEÊg Z0€ 1 vdure (25-yeãr) *l€d zoæ 2 $o69e volure (Opl¡oÈl) sled zone 3 $æs voluñe (OptloÈl) ToÞl D€tent¡on &sin volure Intial $rchars vdume (lY) rnitialgtrç Deóh (þ) Toþl AEil¿ble Dete¡t¡on Depth (tlbbr) Depth d Tdde CÞnnel (ltc) goæ d ldck€ Chanrul (Src) soæs d Mð'n Þsin 9&s (snah) Þs¡n Leryth-tùwdh R.t¡o (&N) Intià|g&rsareå (Asv) $rcharue volure þngth (Lsv) srcÞryvolurewdh (wsv) Depth desin Flr(Hrd) kryth desin Flffi(krd) Wdh dÞsin Flw (wnd) Arcå of Þsin FIM (Añffi) Volume olÞsin Flw(Vnffi) Deplh d Mãin Þsi¡ (H¡oN) Lenqth or M¿in es¡n (l{ÀN) tætionfor lhrRa¡¡fall Depthç = Denver- Gpitd Buildiry Al€r provdlng req!ùed ¡ñpub ahve ifrcludiry tlìourr.lñfall depths,.¡¡ck'Rùil CUHP to q€¡eratê r!¡dhydrq¡aphs ui4q thp enìþdded @loEdo Utun Hydrqraph Prdedure. WQW not pþrldd! Areå of Mãin Þsin (AMN) vduft of Måin Þsin (VMn) ekubtd Tel hsin Vdure (Vmr) EDB 0.æ 150 70 0.0% 1m-M 0.m5 0.017 0.ffi 0.016 0.011 0.016 0.ü6 0.m5 0.016 0.01r 0.021 0.45 0.9 0.011 0.011 I 302c MHFD'Ddêñùoñ-ø E. Bâsin 4/42021,5:06 PM JVA lncorporated 817 Colorado Ave, Ste 301 c¡enwood Springs, CO 8160'1 Ph: (970) 404 3100 Job Name: Beaton Res¡dence Job Number: 3402c Dalei 418121 By: EJK DRY WELL SIZING 25 yr Volume: FACTOR OF SAFETY: TARGET DES¡GN CAPTURE VOL.: 0.01 1 (Acre-Ít) per MHFD Oetention 2L0b@l@eetes!ù 4194.2 (min) 475.23 fr3 1.5f--*îr::ïlt' 4.00 (ft) f---------ç3T (fl ) (8" wall)'--------g'iiril' DryWell I lnner Diameter: Outer Diameter Depth of Gravel below Chambers Gravel Backfill ThicknBss D¡ameter to edge of Gravel R¡m Elevation lnvert lnl Overall Depth Peforated Chamber Depth: Chamber lnv: Perforated Chamber CapÌure Depth: Sump lnv Act¡ve Perc. Area Depth Structure Cåptu¡e Volume: Vol. in Gravel Void Space Total Volume DW I: Total Captured Volume: K Requlred Percolation area: Prov¡ded Percolatlon Area: Dra¡n Down Time (s) = Total Capture Vol. / (K x Perc. Area x .5 clogging factor) Dra¡n Down t¡me DW1: 2516il (s) 30 lin)T--- 1o¡¡l 6903.42 (ft) 6899.20 (ft) 12.00 (ft) 9.00 (ft)I ssgr.¿zl(rt) l----rãã'ltnlI esgr.¿zl(rt)I r.rsltn)l-----lñlrt' I soo.e 1fl"(0.3 Void rat¡o) l---iîr's-lrt' f ?1ü1 0.000058 ftlsecfiGläl-Ìn' hr-ãildã---ln' ig 69.90 (hr) 3402c - Rational Calculations Dry Well S¡zing Ghannel Report Hydraflow Express Extension for Autodesk@ Civil 3D@ by Autodesk, lnc. Basin B Swale Triangular Side Slopes (z:1) Total Depth (ft) lnvert Elev (ft) Slope (%) N-Value Tuesday, Apr62O21 00300 00 =$ -z = 2.OO = 0.033 Section Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (fUs) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) Depth (ft, 3.00 2.50 2.00 1.50 1.00 0.50 0.00 .42 20 0 1 0 2 2 0 2 0 1 53 12 66 39 52 49Galculations Compute by: Known Q (cfs) Elev (ft) 103.00 102.50 102.00 101 .50 101.00 100.00 Known Q = 1.12 50100 86420 /\/\/\t\t\t\/\./\t\.t\,t\,/\,/\/\-/\-U\=:',/\\.t\/ 99.50 Reach (ft) 10 12 14 16 -0.50 Ghannel Report Hydraflow Express Extension for Autodesk@ Civil 3D@ by Autodesk, lnc. Basin G Pan Tuesday, Apr62021 User-defined lnvert Elev (ft) Slope (%) N-Value Galculations Compute by: Known Q (cfs) = 6901.45 = 0.50 = 0.013 Known Q = 0.73 Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (fVs) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) = 0.20 = 0.730 = 0.51 = 1.45 = 5.46 = 0.19 = 5.44 = 0.23 (Sta, El, n)-(Sta, El, n)... ( o.oo, osoz.ooj-1a.so, 6901 .s8, 0.013)-(10.00, 6901 .4s, 0.0r 3)-(1 1 .s0, 6901 .58, 0.013)-(16.81 , 6902.00, 0.013) Elev (ft)Section ô903.00 lgoz.so 6902.00 bgot.so ô901.00 I Depth (ft1 1.55 1.05 0.55 0.05 -0.45 6900.I 10 12 14 16 18 G / \\ 50 -2 0 2 4 6 Sta (ft) 20 -0.95