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HomeMy WebLinkAboutDrainage Reports - 05/26/2016-9--ak-L A This Drainage Report is consciously provided as a PDF. Please consider the environment before printing this document in its entirety. When a hard copy is absolutely necessary, we recommend double -sided printing. May 20, 2016 City of Fort Collins Approved Plans Approved by Date: s/u zo�cp Prepared for: CSURF P.O. Box 483 Fort Collins, CO 80522 Prepared by: NORTHERN ENGINEERING 200 South College Avenue, Suite 10 Fort Collins, Colorado 80524 Phone: 970.221.4158 Fax: 970.221.4159 Project Number: 232-033 NorthernEnaineerina.com /1 970.221.4158 I NORTHERN ENGINEERING Drainage Letter Report ' Date: May 20, 2016 Project:. Centre for Advanced Technology 23rd Filing, Lot 2 — Minor Amendment Fort Collins, Colorado Attn: Mr. Dan Mogen City of Fort Collins Stormwater Utility 700 Wood Street Fort Collins, Colorado 80521 Dear Dan: Project No. 232-033 This letter serves to amend a portion of the stormwater letter submitted and approved for Centre for Advanced Technologies 23' Filing, Lot 2. Lot 2 is currently under construction and has a plan to open later this year. The Owner would like to remove a portion of the permeable pavers specified with the original design. This letter serves to document the stormwater impacts associated with the removal of the northern pavers and offsets proposed to achieve allowable LID treatment for the overall site. The previously approved plan supplied over 25% of the drivable space with permeable pavement and over 50% of the impervious area with a form of LID treatment. Within the proposed Minor Amendment, the pavers will be removed within the northern parking lot and a rain garden is proposed in the northern most corner of the project. The rain garden will be constructed with bio-media to enhance infiltration and a perforated underdrain is designed to discharge water within the rock section directly into the existing 2'x2' area inlet. The rain garden has been graded to allow for 12-inches of ponding before overtopping at the ' as -built elevation into the existing area inlet constructed for Sunshine House (Lot 1, Centre For Advanced Technologies, 23rd Filing). Basins Al, B1-B2, Cl-C6 and R1-R7 are all designed to drain to the proposed rain garden. Sub -Basin C5 is still proposed to include permeable pavers and therefore, all water quality is accomplished within that sub -basin. In changing the pavers to standard. pavement, the overall proposed impervious area is 1.276 acres. This includes the area still being proposed as permeable pavers. The area being treated by the permeable pavers within Basin C5 is 0.201 acres. The rain garden has been optimized within the area between Perennial Lane and the shared access to maximize treatment, resulting in a water quality capture volume of 1,192 cubic feet. Using Urban Drainage, this amount of volume will treat 0.794 acres of impervious area. The combination of the permeable pavers and the rain garden will treat 0.995 acres, resulting in over 78% of the entire impervious area proposed within the project. An LID Table has been included along with Urban Drainage sizing calculations, and can be found at the end of this drainage letter. In converting the permeable pavers into concrete paving, there was an increase in the peak runoff rate generated from Basin Al. Basin Al was previously designed to be 62 percent impervious. With the conversion from pavers to concrete, this basin increased by 19 percent imperviousness, totaling 81 percent. The Rational Method calculations were revised to show this increase in imperviousness and have been added to the end of this drainage letter. With the increased runoff within Basin Al, Storm Line A ' Drainage Letter Report Page 1 of 3 ' NORTHERN Centre for Advanced Technology ENGINEERING 23rd Filing, Lot 2 — Minor Amendment and Inlet Al were analyzed to show the increase in 100-year peak rates. Storm Line A can adequately convey the 100-year event as previously designed. The curb inlet will be required to be installed at the high hood setting to capture the 100-year event before overtopping the curb into Sunshine House. Due to the increased flow within Basin Al, the overall runoff of the site was increased. To ensure that the existing downstream infrastructure could handle this increase, the existing storm line and inlet constructed with Sunshine House were analyzed. Both the inlet and storm line have adequate capacity to handle the 100- year event.. Within the original design of The Grove, all stormwater infrastructure was designed with the assumption that Tract A (Centre For Advanced Technologies, 23rd Filing, Lots 1 & 2) would be developed at an overall percent imperviousness of 90 percent. Sunshine House was previously designed and constructed with a percent imperviousness of 57 percent. While there will be a slight increase in imperviousness with changing the permeable pavers to standard pavement, the overall percent imperviousness proposed is only 60 percent. The proposed percent imperviousness of Lot 2 and the constructed imperviousness of Lot 1 are well below the designed percent imperviousness assumed for The Grove, and therefore, all downstream stormwater infrastructure will adequately convey the runoff generated from this project. Please feel free to contact us with any questions or concerns Sincerely, 1 H I I H 1 I Cody(N. Snowdon iO5.20.1�c Project Engineer Nicholas W. Haws, PE LEED Vice President AP AP APPENDICES: APPENDIX A APPENDIX B APPENDIX C APPENDIX D APPENDIX E APPENDIX F — Rational Method Developed Runoff Calculations — Hydraulic Calculations — Water Quality Calculations — Modified Hydraulic Calculations (Sunshine House) — Supporting Documents (Sunshine House) — Supporting Documents (The Grove) Drainage Letter Report Page 2 of 3 f� f i 1 i '. fi OC i Enaineerina.com 1/ 970.221.4158 I N m C LL if 0 U N U C t 0 N tN I I I I I I I I O o o 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 0 0 n E E e N V to 0 m ID tD O O O O O O O O O ,y O E 00 ap N00 Nm0-+M.� OI OI OI OI Ol Ol 6l tDn l0 O U o Np tD J 0 oMmmvv�00000oornvrnov cEn3No O N O v to .� m f, m O O O o 0 0 0 I Ol. 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Snowdon Company: Northern Engineering Date: Project: May 12, 2016 CAT 23rd, Lot 2 Minor Amendment Location: Pond A 1 L I 1 I I I 1, Basin Storage Volume A) Effective Imperviousness of Tributary Area, 1a 1„ = 100,0 % (100% if all paved and roofed areas upstream of rain garden) B) Tributary Area's Imperviousness Ratio (i = I/100) = 1.000 C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time WQCV = 0.40 watershed inches (WQCV= 0.8' (0.91' i3- 1.19' i?s 0.78' i) D) Contributing Watershed Area (including rain garden area) Area = 34.574 sq ft E) Water Quality Capture Volume (WQCV) Design Volume Vwocv = 11152 Cu ft Vol - (WQCV / 12)' Area F) For Watersheds Outside of the Denver Region, Depth of dS = in Average Runoff Producing Storm G) For Watersheds Outside of the Denver Region. VWocv oTMER = cu It Water Quality Capture Volume (WQCV) Design Volume H) User Input of Water Quality Capture Volume (WQCV) Design Volume VQQCV USER = cu it (Only ff a different WQCV Design Volume is desired) 2. Basin Geometry A) WQCV Depth (12-inch maximum) Dwocv = 12 in B) Rain Garden Side Slopes (Z = 4 min.. hor¢dist per unit vertical) Z = 4.00 ft / ft (Use'0' if rain garden has vertical walls) C) Minimum Flat Surface Area AM,,, = 768 sq ft D) Actual Flat Surface Area Arv,„R = 992 sq ft E) Area at Design Depth (Top Surface Area) Arm = 1392 sq It F) Rain Garden Total Volume Vr= 1.192 cu It (Vr ((Arm' A,,.) / 2)' Depth) 3. Growing Media Choose One (* 18" Rain Garden Growing Media Q Other (Explain): 4. Underdrain System Choose One 0 YES A) Are undercraire provided? NO B) Underdrain system orifice diameter for 12 hour drain time i) Distance From Lowest Elevation of the Storage y= ft Volume to the Center of the Orifice ii) Volume to Drain in 12 Hours V0112= N/A cu ft iii) Orifice Diameter. 3/8' Minimum Do = N/A in 1 232-033 Rain Garden (75%) UD-BMP_v3.02.xls, RG 5112/2016. 11:28 AM Design Procedure Form: Rain Garden (RG) Sheet 2 of 2 Designer. C. Snowdon Company: Northern Engineering Date: May 12. 2016 ProjectCAT 23rd, Lot 2 Minor Amendment Location: Pond A 5. Impermeable Geomembrane Liner and Geotextile Separator Fabric Choose One r Q YES A) Is an impermeable liner provided due to proximity I Q NO of structures or groundwater contamination? 6. Inlet / Outlet Control j� Choose One I QQ Sheet Flow- No Energy Dissipation Required A) Inlet Control I Q Concentrated Flow- Energy Dissipation Provided Choose One 7. Vegetation Seed (Plan for frequent weed control) Q Plantings �O Q sand Grown or Other High Infiltration Sod 8. Irrigation Choose One - Q YES A) Will the rain garden be imgaled? I* NO Notes 1 232-033 Rain Garden (75%) UD-BMP_v3.02.xis, RG 5/12/2016, 11:28 AM I I I I i I I I I NORTHERN ADDRESS: PHONE: 970.221.4111 WEBSIIE: ENGINEERING ZW S. Cullege Ave. Suite 10 Fort Collins, CO 90524 FAX 970.221.4159 www.narihenrengmeenng.com Project Title CAT 23rd Filing, Lot 2 - Minor Amendment Date: May S, 2016 Project Number 232-033 Calcs By: C. Snowdon Client CSURF Pond Designation Rain Garden K10C Water Quality VDIu - 0.0265 ac-ft -yr Detenti1) N.A. Total Po N.A. v D' A, +AZ + A, * AZ/ 3 D = Depth between contours (ft.) AI = Surface Area lower contour (ftZ) AZ = Surface Area upper contour (ft') Elevation Surface Incremental Incremental Total Vol. Total Vol. (ft) Area (ft') Depth (ft) I Vol. (ft') (ft') (ac-ft) 5005.65 922.25 0.00 0.00 0.00 0.0000 5005.80 990.64 0.15 143.44 143.44 0.0033 5006.00 1081.96 0.20 207.19 350.63 0.0080 5006.20 1173.62 0.20 225.50 576.12 0.0132 5006.40 1268.75 0.20 244.18 820.30 0.0188 5006.60 1367.21 0.20 263.53 1083.93 0.0249 5006,65 1 1392.20 0.05 68.98 1152.82 0.0265 Elevation Depth Volume WQCV 5006.65 1.00 0.0265 100-yr Detention N.A. N.A. N.A. Overall Detention NA. N.A. N.A. i I 1 r 1 I I I I r I I I I 1 V120 - Vrlority "#.w f� I North ernEnoineerina.com 11 470.221.4158 I IRE M r- U Q r t:l M V, Q U r. I° s N V Q) R N O Q! 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'0 021 SA 52 am Qa Sa x0 an I'm 9 % aa5 xa Sa ON I OST E. z 05 047 an 50 So Oil on 9 so Not n G 001� DR) all no 0 0 0 5 c5 ORO 059 0J< BI 0 N 0 W 005 030 037 50 5.0 am 019 It m 019 4 0 095 lal 50 50 EU am 003 095 LOOP 50 5 a15 on 0 am a19 0 0.13 an 5 al 50 50 al, Dag W 50 5-0 aN Offi 50 am On a so ai m 9.9 so S0 Dal am cots.o so ON D.0 O FOR DRAINAGE REVIEW ONLY NOT FOR CONSTRUCTION 6„ ® NORTH m Z V J9 0 30 Bo 90 EM aln FEET ). n LEGEND: I ` PRGKRtt BWwMY PROPOSED BASIN UNES EMSFNG STORM SENEP LINE y PROPOSED UNOERCRAIN PRCPOYD STORM DRAM y EXI ml£i IRATE ■ z PR09ED CONTOUR �.'�� W 2j EXISTING CCMWR-�lOID- M1 PP01 m SN.LLE MMXI"x UNITS OF oEVRomw YL j PROPOSED INFLOW MERMK Z MMaWrn FROP02o WITAU `ARTI MM A M1 PROPOSED MMM WAR V'�g' V)14'• ObV y4" PROPOSE➢ OVERLAND FLOW aIECTM V p6.1 1 PROPOSED PERMEABLE PAMIRS •.......... ' PROPOSED RAIN OMNEx Z� BASIN MUMIRMNOFFc MINOR PVIKiF GO6FIOEIIT EE�B1 MAJOR RUNOFF COEmaMT w f BASIN AMG(£ y W OESM PONT A ! [] z NOTES: Z w I. ME 9IE. AND OCATE OF ALL KNOW UNCERMWNO RE A ROXIMATE MIEN ITTSMI ARE iA ME9: aiTO E F THE IT MNL BE ME PESPONABIUiY OF THE CMTUCTM MUCH ME EXISTENCE OF IN UFESCONS IN THEIO eE RE COMMENCING W THE CONTRAACTOOR SHALL BE FECEPXOM4elE FOR LOCCAnNG A.- P& UNDERGROUND UMFE9 AND SHALL BE PESPMSM FOR FM !a ALL UNKNOWN UNDERGRMND MITI 3. REFER TD THE FINAL MANAGE UTTER Miami FOR CENTS ! FOR ADVANCED T:CMCLOI I]IA TUNG - LOT E DAME ANE II. W15 FOR AIDInMAL INFMAn . �l BENCHMARK FRQECF DATUM: NAVE R9 m aty of FM Come bench aF 11-99 Comedy IM Mt aM M IM FtxxclPn of Contra Ax. PRE n Rxwrcn RON. w the exl Chat of Ps south KwGwII m Cnl,e A", On,ow-505I.16 og City or Fiat CdIFe owahmvE I-93 TSwN Shisdo 5L at Me nWmx to RNIwa Moias FVY. an wet e of pants m tap of can EIsw1Im-5096.44 m ` itb F� BpyfA¢( Plea" Note: Ths plan xl Is using NAVEMB Iw a wrtkol datum, rynw14X9 Dwd,p N Mx u"d NOW29 Unadjusted far their "rake datums. 6N aJ Em If NVOC" L'nedpwaa WWm X aqumd Ia any Wrpme, the (Moving spmikn Amid the Naed: NO AOW Unod4NM - NAwm - MV FEMA REFERENCE: 0 FAIR (ROCO wAP.W'S RAT: MOP): PANEL MOM J MAP QxR aexa 70 EFTIMME DATE MAY z =2 Q PRaFCnM: STAR FWIE caMAOO xMM (FEET) Z_ mz Tu DAWN: u GRTSe0 slum H NRICAL DATUM. NAw H (SEE NOT3 5 AND a.MAM6FLOyJ N AL GE(Cfnc ax(wil j<MCA MM 9EPM2 ¢NT(1a))ail-W1 Wr NATIONAL. FLOOD IN)RAHCE PRO[AAM wFaRMAnaH: FEM (q A MM O aXM-iM1 0J X W GXL III NOTFIC ICENTEROF Z Z LU jJ U • any � 141 MBIebOItlN Q Call before eg re u. 0 N LL /LSO/ uimmmro,emnmuw ' 11 City of Fort Collins, Colorado w UTILITY PLAN APPROVAL Z T ee wi wa 9 3D BY: ✓t �/r 1 9 30 IT _Bw'ks /8P� cI9Ae SnBBt May— taE �Enear Ci6.00 Of Ia: wwr �� or 17 sneers