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HomeMy WebLinkAboutDrainage Reports - 08/31/2015FINAL DRAINAGE REPORT FOR DOWNTOWN DEVELOPMENT AUTHORITY'S OLD TOWN SQUARE RENOVATION I DR City of Fort Colli s Appro ed lans S Q v jr- R£ Approved by: RENOVATION Date: d12/.zol� AT OLD TOWN SQUARE FORT COLLINS, COLORADO FOR dda DOWNTOWN DEVELOPMENT AUTHORITY 19 OLD TOWN SQUARE, SUITE 230 FORT COLLINS, COLORADO 80524 MARCH 31, 2015 TABLE OF CONTENTS SECTION 1 —ENGINEER'S CERTIFICATION BLOCK........................................................................3 SECTION 2 — GENERAL LOCATION AND DESCRIPTION.................................................................4 SITELOCATION.................................................................................................................... 4 DESCRIPTIONOF PROPERTY..................................................................................................4 BENCHMARK INFORMATION..................................................................................................4 SECTION 3 — STORM DRAINAGE CRITERIA..................................................................................5 HYDROLOGICCRITERIA........................................................................................................5 HYDRAULICCRITERIA...........................................................................................................5 SECTION 4— DRAINAGE BASINS AND HISTORIC RUNOFF..............................................................6 HISTORICBASINS.................................................................................................................6 PROPOSEDDEVELOPED BASINS............................................................................................ 7 PROPOSED DETENTION/WATER QUALITY POND.................................................................... 10 HISTORIC/DEVELOPED BASIN COMPARISON........................................................................ 11 SECTION 5—STORMWATER POLLUTION PREVENTION................................................................. 12 TEMPORARY EROSION CONTROL........................................................................................ 12 PERMANENT EROSION CONTROL......................................................................................... 12 SECTION6 —CONCLUSIONS ................................................................................................... 13 SECTION7 — REFERENCES....................................................................................................... 14 LIST OF TABLES TABLE 1. HISTORIC FLOWS - 10 YEAR. (BASED ON RATIONAL METHOD) ........................................ 7 TABLE 2. DEVELOPED FLOWS - 10 YEAR. (BASED ON RATIONAL METHOD)....................................9 Old Town Square Renovation Drainage Report Page 1 of 14 APPENDIX APPENDIX A — HYDROLOGIC COMPUTATIONS 1 . FIGURE 1 —SITE VICINITY MAP 2. SOIL MAP - NATURAL RESOURCES CONSERVATION SERVICES (NRCS) 3. FEMA FLOOD MAP 4. CITY OF FORT COLLINS FLOOD MAP S. FIGURE 2- HISTORIC DRAINAGE MAP 6. FIGURE 3 - PROPOSED DRAINAGE MAP 7. RATIONAL WORKSHEETS Old Town Square Renovation Drainage Report Page 2 of 14 ' SECTION 1 - ENGINEER'S CERTIFICATION BLOCK ' I hereby certify that this Final Drainage Report for the Old Town Square Redevelopment was prepared by me (or under my direct supervision) for the Owners thereof and meets or exceeds the criteria of the City of Fort Collins Stormwater Design Standards. Signature: Charles R. Hager IV, P.E. ,, Registered Professional Engineer State of Colorado No. 37146 '00'save,, HF/�G qc 9�0 37146 .. w Old Town Square Renovation Drainage Report Page 3 of 14 SECTION 2 - GENERAL LOCATION AND DESCRIPTION SITE LOCATION The Old Town Square is located between Mountain Avenue and Walnut Street in the City of Fort Collins, Colorado. Refer to Appendix A for Figure 1 the site vicinity map. DESCRIPTION OF PROPERTY The site is owned by the Downtown Development Authority (DDA), and the area of redevelopment is approximately 1.3 acres. The site is currently the general pedestrian thoroughfare between the developed block known as Old Town Square between Mountain Avenue and Walnut Street. The site's stormwater runoff was originally designed to drain into various inlets throughout the Square with surface slopes from 0.6% to 1%. The soils within the site consist of Loveland clay loam and Nunn clay loam which have been classified based on the Natural Resources Conservation Services (MRCS) attached in Appendix A. Both Loveland clay loam and Nunn clay loams have a Type C hydrologic soil group with a moderate inflation rate. A Geotechnical Engineering Study was performed for the site and measured ground water at depth of 19 feet below existing grade in borehole TH-1 and a depth of 14 feet below existing grade in borehole TH-2. The property is not located within the 100 year floodplain as shown on the City of Fort Collins Flood Map attached in Appendix A. The property is determined to be outside the 0.2% annual chance flood plan base on the Federal Emergency Management Agency (FEMA) flood map (FEMA panel # 08069C0979H). The main purpose of this study is to analyze the existing and proposed drainage patterns in order to convey stormwater through the property to the historic drainage way southeast and southwest of the site. Existing stormwater inlets will be utilized where feasible, with some of them being modified to accommodate the proposed design. The proposed scope of work will include site grading to provide positive drainage for the new improvements, and fix the existing ponding conditions in the Square. BENCHMARK INFORMATION Topographic and survey information was provided by King Surveyors, Inc. Vertical datum is referenced from Fort Collins Benchmark 5-00, Record Elevation = 4,974.87, NGVD 1929 unadjusted. Benchmark 5-00 is located at the southwest corner of Linden Street and Jefferson Street. The second vertical datum is City of Fort Collins Benchmark E136, Record Elevation = 4,992.21, NGVD 1929 unadjusted. Benchmark E136 is located at the southwest corner of the intersection of Oak Street and College Avenue in the old Post Office building. Old Town Square Renovation Drainage Report Page 4 of 14 SECTION 3 - STORM DRAINAGE CRITERIA This report was prepared to meet the criteria as set forth in the design proposal by the DDA. The ' proposed improvements to Old Town Square, and the nature of the existing constraints, make it unfeasible to bring the Square into compliance with the latest City storm drainage criteria and LID requirements. We have made every attempt to improve the existing conditions, provide ' adequate safety measures, and protect the public, while maintaining the design intent. The City of Fort Collin's Storm Drainage Design Criteria and Construction Manual (with all current 1997 Revisions and 2012 Amendments) (CoFC-SDDCCM) and the Urban Drainage Flood Control District's (UDFCD) Drainage Criteria Manual (USDCM) Volumes 1, 2 and 3 were referenced as guidelines for this design. HYDROLOGIC CRITERIA The rational method was performed to calculate the peak runoff rates for each basin. The City of Fort Collins runoff coefficients were used for the analysis. Weighted percent impervious was calculated for each basin using Table RO-3 in the Urban Storm Drainage Criteria Manual. The ' weighted runoff coefficients were calculated for each basin using Tables 3-2 and 3-3 in the City of Fort Collins — Storm Drainage Design Criteria and Construction Standards (CoFC—SDDCCS). The time of concentration was calculated using the equations given within section 2.4.1 of the ' USDCM equation RO-3. The intensity was calculated using the corresponding storm rainfall depth and USDCM Equation RA-3. The City of Fort Collins area has 2-yr 1-hr rainfall depth of 0.82 inches, a 10-yr I hr rainfall depth of 1.40 inches and a 100-yr 1 hr rainfall depth of 2.86 ' inches. These depths do account for the 1997 adjusted rainfall depths. HYDRAULIC CRITERIA ' The existing storm drain mains will remain. This report details the analysis of the existing system, and the changes incurred due to the improvements. Old Town Square Renovation Drainage Report Page 5 of 14 SECTION 4 - DRAINAGE BASINS AND HISTORIC RUNOFF HISTORIC BASINS The existing site has been divided into separate basins, Sub -Basins Hl through H13 as shown on the attached Drainage Figure 1 in Appendix A. Basins H 1, H4, H5, H6, H 12, H 13, H 14, and H 15 drain to various inlets throughout the Square. Basin H3 drains to the fountain in the Square. Basins H7, H8, H10, and HI I represents drainage that sheet flows to the existing south side of Walnut Street that is conveyed to various inlets along the street and into the storm sewer system. Basin H2 sheet flows to Mountain Avenue and into storm inlets along the street. Basin H9 drains to the low areas within the basin and ponds eventually evaporating. Rational method calculations with peak flows for the individual sub -basins are attached in Appendix A and listed below in Table 1. Old Town Square Renovation Drainage Report Page 6 of 14 Table 1_ Hictnrie Flows- 16 vear_ (Raced an Rational Methndl Drainage g Basin Design � Point Percent impervious (%) Area (ac) Q-10 (cfs) Q-]00 (cfs) HI 1 98.2% 0.05 0.17 0.36 H2 2 97.0% 0.20 0.76 1.63 H3 3 89.7% 0.43 1.64 3.54 H4 4 100% 0.03 0.13 0.27 H5 5 100% 0.01 0.03 0.07 H6 6 75.2% 0.03 0.12 0.26 H7 7 100% 0.04 0.16 0.34 H8 8 99% 0.06 0.27 0.57 H9 9 100% 0.21 0.73 1.57 H 10 10 100% 0.03 0.10 0.21 17111 11 100% 0.05 0.24 0.51 1-112 12 100% 0.03 0.13 0.28 H13 13 96.3% 0.09 0.39 0.84 H 14 14 100% 0.05 0.21 0.45 H 15 15 100% 0.06 0.22 0.47 TOTAL SITE 1.36 5.28 11.37 PROPOSED DEVELOPED BASINS The Downtown Development Authority proposes to renovate Old Town Square. The renovation includes the construction of a stage and storage near Walnut Street and adding new water and landscaping features. The overall imperviousness of the site will be slightly higher due to the removal of the concrete landscaping areas in the northern portion of the Square, the new imperviousness is approximately 97%. Access to the site will remain pedestrian traffic from Mountain Avenue, Walnut Street and Trimble Court. The site has been graded to drain towards new, existing, and renovated storm Old Town Square Renovation Drainage Report Page 7 of 14 tinlets along the base of the landscape features and pedestrian inlets throughout the Square. See Figure 3 in Appendix A for the proposed drainage Sub -Basins and grading plan. ' The site has been divided into 27 separate basins. All sub -basins drain to various drains throughout the Square with the exception of sub -basins OS-1, OS-2 and OS-3. Sub -basin OS-1 ' borders Mountain Avenue and sheet flows to the curb and gutter along Mountain Avenue and into storm sewer inlets along the road. Sub -basins OS-2 and OS-3 border Walnut Street and stromwater sheet flows into curb and gutter along Walnut Street and into storm inlets along the ' road. Sub -basin A 1 is all pavers with the exception of one tree grate. Stormwater from A 1 drains to an ' existing inlet just north of the tree grate and Mountain Avenue. Sub -basin A2 will drain into an existing inlet located in the base of a large landscape feature. ' The existing inlet is to be modified per the grading and drainage plan to lower the lip of the inlet. Sub -basin A3 will drain into an existing inlet located in the base of a large landscape feature ' opposite the inlet for sub -basin A2. The existing inlet is to be modified per the grading and drainage plan to lower the lip of the inlet. Sub -basin A4 will drain into an existing inlet located in the base of a small landscape feature. The existing inlet is to be modified per the grading and drainage plan to lower the lip of the inlet. Sub -basin A5 will have a manhole cover replaced with a manhole inlet cover to capture stormwater in this basin. Sub -basin A6 will drain into an existing inlet located in the base of a small landscape feature. The existing inlet is to be modified per the grading and drainage plan to lower the lip of the inlet. Sub -basin A7 will funnel to a proposed inlet at the base of the ramp just outside of the play area. Sub -basin A8 includes the proposed play area. The play area is lower than the surrounding paver elevation, as a porous soft play surface approximately four inches thick covers the concrete. The existing inlet in the planters will be modified to be lowered, and an additional inlet will be added to capture additional flows. Sub -basin A9 will drain into an existing inlet located in the base of a small landscape feature. The existing inlet is to remain and does not require modification. Sub -basin A10 is graded to drain to a proposed inlet across from the water feature near the west side of the stairs. Sub -basin Al 1 will drain into an existing inlet located in the base of a small landscape feature. The existing inlet is to remain and does not require modification. Sub -basin A 12 is graded to drain to a proposed inlet near the east side of the stairs. Sub -basin A 13 is graded to drain to an existing inlet. Which does not require modification. Old Town Square Renovation Drainage Report Page 8 of 14 Sub -basin A 14 includes the southern water feature and the proposed oval vernal pool. Water will be drained to the surge tank for the fountain. Due to the standing water associated with the water features, this area will be captured with the fountain water in a surge tank where it is filtered and chemically treated. This water eventually is pumped to the sanitary system. Sub -basin A 15 includes the area southeast of the proposed stage and is graded to drain to a proposed inlet. Sub -basin A16 includes the area to the southwest of the proposed stage and is graded to drain to a proposed inlet. Sub -basin A 17 includes the small area directly west of the proposed stage and is graded to drain to a proposed inlet. Sub -basin A18 includes the roof of the proposed stage. The roof drains will be piped into the storm manhole to the northeast of the stage. Sub -basin A19 is graded to drain to an existing inlet south of the northwest landscape feature along Walnut Street. Sub -basin A20 includes the area north of the proposed stage to Walnut Street. The area is graded to drain to a proposed inlet. Sub -basin A21 is graded to drain to an existing inlet. Sub -basin A22 historically drained to the existing trench drain. This drain will be removed, and an inlet installed in its place. Sub -basins A23, A24, and A25 are graded to drain into existing inlets that will be replaced with a nyloplast inline drain and connected to the existing stone drain. Table 2. Developed Flows- 10, and 100 year. (Based on Rational Method) Drainage Basin Design Point Percent Impervious % P ) Area ac ) 10 cfs Q ) 100 cfs Q- ) Al 1 98% 0.05 0.17 0.36 A2 3 77% 0.05 0.14 0.31 A3 4 100% 0.01 0.04 0.10 A4 5 88% 0.02 0.07 0.14 A5 6 88% 0.04 0.16 0.34 A6 7 100% 0.01 0.05 0.12 A7 8 100% 0.03 0.12 0.25 Old Town Square Renovation Drainage Report Page 9 of 14 Al 9 1000,6 0.02 0.07 0.15 A9 l0 59% 0.03 0.09 0.19 A 10 11 100% 0.12 0.44 0.94 All 12 70% 0.01 0.03 0.06 Al2 13 100% 0.05 0.17 0.36 A 13 14 100% 0.01 0.05 0.11 A 14 15 100% 0.04 0.17 0.36 A 15 16 100% 0.11 0.44 0.94 A 16 17 100% 0.09 0.35 0.75 A 17 18 100% 0.01 0.02 0.05 A 18 19 100% 0.03 0.12 0.25 A19 20 100% 0.04 0.18 0.38 A20 22 100% 0.03 0.13 0.28 A21 23 100% 0.03 0.10 0.22 A22 24 100% 0.05 0.20 0.42 A23 25 100% 0.01 0.04 0.08 A24 26 100% 0.01 0.05 0.11 A25 27 100% 0.01 0.04 0.09 OS-1 2 98% 0.25 0.83 1.79 OS-2 21 100% 0.01 0.03 0.07 OS-3 21 1000/0 0.08 0.29 0.61 TOTAL SITE 1.27 4.57 9.84 PROPOSED DETENTION/WATER QUALITY POND Old Town Square is located in the center of a metropolitan area. The location does not have the space required to construct a detention pond for excess water storage from large storm events. Old Town Square Renovation Drainage Report Page 10 of 14 ' The stormwater piping is/will be sized to manage the flow of water during the 10-year event at a minimum. ' HISTORIC/DEVELOPED BASIN COMPARISON ' The redevelopment of Old Town Square will create a small increase in the overall peak runoff and volume from the contributing areas due to the decrease in pervious areas. However, the additional storm inlets connected to the existing infrastructure and appear to handle the increase. ' The improvements to the Square will provide a safer, healthier and more enjoyable environment than currently exists. Old Town Square Renovation Drainage Report Page 11 of 14 SECTION 5 - STORMWATER POLLUTION PREVENTION TEMPORARY EROSION CONTROL A temporary erosion control plan is to be implemented for the site during construction. Temporary erosion control measures include, but are not limited to, storm inlet protection provided by the use of erosion control wattles/sediment control logs, inlet protection, etc. All temporary erosion control measures are to be removed after they are deemed unnecessary. PERMANENT EROSION CONTROL Permanent erosion control measures will not be necessary after construction. All landscaped areas are contained in concrete planters and the remaining area will be constructed of pavers, concrete, and asphalt. Old Town Square Renovation Drainage Report Page 12 of 14 SECTION 6 - CONCLUSIONS This Final Drainage Report for the Old Town Square Renovation has been prepared using the ' stormwater criteria set by the City of Fort Collins. The proposed drainage systems presented in this report are designed to convey the proposed peak stormwater runoff through the site to the existing stor nwater inlets. Through calculations and review of the existing storm drain system, ' there appears to be adequate capacity to convey the proposed flows. This report also proposes best management practices for erosion control, permanent landscaping, riprap, and on -site construction facilities. It can therefore be concluded that stormwater system complies with all of the stormwater jurisdictional criteria and will not adversely affect the existing streets, storm drain system and/or ' detention/water quality facilities. Old Town Square Renovation Drainage Report Page 13 of 14 SECTION 7 - REFERENCES 1 ' 1. Urban Storm Drainage Criteria Manual (Volumes 1, 2, and 3), Urban Drainage and Flood Control District, June 2001, Revised April 2008. ' 2. Storm Drainage Criteria Manual and Construction Standards, City of Fort Collins Storm Water UtilityCijy, of Fort Collins, Colorado, Updated January, 1997 with 2012 amendments. 3. "Hydrologic Group Rating for Larimer County Area, Colorado', USDA -Natural Resources Conservation Service, National Cooperative Soil Survey. Web Soil Survey URL: http://websoilsurvey.nres.usda.gov. [12/6/2012] ' Old Town Square Renovation Drainage Report Page 14 of 14 ' APPENDIX A - HYDROLOGIC COMPUTATIONS ' 1. Site Vicinity Map 2. Soil Map - Natural Resources Conservation Services (MRCS) ' 3. FEMA Map ' 4. City of Fort Collins 100 year Flood Map 5. Rational Worksheets 6. Historic Drainage Map 7. 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LL U `n a N O c m y l0 y O y a O p J y .d. O O 0. N '7 m m L° 0 o m m uc un N> 3 o 0 in e X E v m c Q Te a �. 3 � m y 0 C O y N n Cpy O c O a 3 V 0.J D y > .. .- y N N C j p a >y Nv TwC a a NY N n v N t c °° v >> n_ C > > m 7 c )N N c m U 0 (U) iViU d a c m 6 -off ■ 0v0x _; 0� 4(00 +: Q N y O Z U J N U N c°n d Cl a 3L) c O m Z Soil Map—Larimer County Area, Colorado Old Town Square, Fort Collins, CO Map Unit Legend Larimer County Area, Colorado (CO644) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 81 Paoli fine sandy loam, 0 to 1 1.3 19.3% percent slopes 94 Satanta loam, 0 to 1 percent 5.5 80.7% slopes Totals for Area of Interest 6.8 100.0% tbUA Natural Resources Web Soil Survey 1/21/2015 Conservation Service National Cooperative Soil Survey Page 3 of 3 NOTES TO USERS t ICr v m VmMp IN, NapniFmaP . -'.Iprowjm]m mnyor . wiM1ass ruNry nY asmNR ro rmr Nv damage a JNiYV mall RRI TNe N.Wy mad IeNIN"11 znvn. 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(wlncT may o� !e 1-pMmtanesM`tlwQ Eee)) aIm Errngenry A(]l-P Ran• m tl1e Nest¢ sysean(s) tloin a VEY1dq PIYEtDaR b a� on LNW paNe Ta InL9we EIwE TdL h re90ru'rtk drfiat Pad Wh oLYI1Ws atl reslvRs are 010,Wnp1 RE CEV" n Raop AV .dIAE 1M4�TpaFIN P VI FLUE. AL meazweF F+x rrore mEl h ftp H m fief II15MTwCC, treeres[V Nee sMuM vlvl the FFMA W Vs'Le a! N1W".11waw N»M.povlblrreM/MWirlmaE.sMm. a50DLU E 1 FLOODING EFFECTS ENI: VA SPRNG CREEA sc - ZONE AS FL(ODING EFFECTS 1I 1.Aµ1 NIF.R Lilt N" CACHE L4 POUDRE RIVER I NINET)RPORATEII AREAS 080101 3116000 FT \ JONS PANEL N77 ZONE AE ZONEAE `4s FLOODING EFFECTS FROM IDgr � CACHE LA POUDRE flIVER RIVER { 1 - ' a y c 1951 ZONEAH S E «t L fi eAl2 � 11 '�� ` � •'r LLDn9 � ZONE AS 11 NOR � d P 3 E rILE _ E } Ll 16 _ i 1 d ­11 IILJ y_ F LL0185 -T NOTE MAP AREA SHOWN ON THIS PANEL IS LOCATED ¢ WITHIN TONSHIP W WEST. RANGE 7 NORTH ' k' I LLDIS LLP E Y 14 13, ILL ,E LLIO30 Y_ EqN a'4.-------------- CITY OF FORT COLLIES 080102 LL1o2e - GPM k LTJI +ep IL LLIW7 r.. AIMU•UCOMAEEew A - i L El Ep -.t.i € - SY• £ ID•g£ E i 23L j' ~ -O" r...,�r ,... F, ZONE AE ' 9 24 s ZONE AE RAN ZONE ION AE ZONE AO aTINSPANEI nAA- - ra I. I.nI I' V:r E +PnN.lr.rl FLIXJDINGEFFECTSFlFll ZONEAE fF E)PriN(NYA vn SPRNGCREEh y(rnRR lr..A ..AMAN cN...... npop RESONANCE ...E. W CMLYERI LEGEND r SPECIAL R NAZI AREAS ttSFwN1 SUNECT T' INUNUATIpE m THE 1% ANNUAL C= ROOD Ae L1n -1 Para Ibu NINE, Mml. No Nwn a ve mN, I n ve I r Eul M a IY eVra d !ITV d+Wd n 91w' y.a +yn... , Qd RPau b rtrnM b I.Batt /cvc' - AI I SPrtn1.l ErrIDYC rtlp Ecc i M Waw V M u .,C HNM E.....a.. M. aYEawYa s.Wartle. LYNnm R EA mere Ebm EMYYYEaYEmaW III. aE BEEerbE ENfbw Mp:vW NUT1a E EmJW V W BE"NG eRC'.ECIEe LL aL<nartt:E CP 4RF,1[R n1ZL [ Ml 1. wpn s ID) EW lbr✓/ s+w W pnY91 1 " 9`NnE COO Ws`Rav ,r:EVEF 3131EY •JVENFONUNA Z(aeE aO 1py bapn tl IID l M VI YtW b m 0aq b. DR FAILURE O E ANY L FYIl SSIENISlSN.1F FOX appnRWLLMFONY.T. 6R 1.E A[eAEpl[n NnEEr %MIT hes+m� y aru d I'L— y- M1.Nm ,ebi.. tlslabrvNl LEyg NpI.- LN W1Ea TD aSEAE tEMIEW ycID E;yL rYve 4n bnbn " wv IRV R, eLm1Mu1 tx w CITY OF FORT COLLINS IN aA"^ agog 080102 aoNE AW n yaws M1vn LY svuY Oan hd P E INa yvEma .PW.. urYw m..mm., .s EIWa ... Ems. v wu I.E. f Ible mn .N wEYq Nrse IrMrr [mml. n Eee re•. IE,EIoa hYvn.a'E IgEE vE [ Y hd me .ar .wub ware Irn earl. tie IL.. 6.m.. arramvs ® ROODWAY AREAS 1N ZONE AE . Nm.4 . IN, sawn d . maan . an Wlwa[ AVENN, .a W If rM PN Pe I w.wl Ory rEtp b [.•+d ..n 'N ID� naN Ilan Q OTHER ELOOO AREAS xwA. 4m a oxN ...a m.ra •Rtl 1N .a yaps aEmE Yew I Rat a .N N+Yr.a R YY.am pews h Ywe. 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Fort Collins Mina Design Seam 10 Major Design Summit Soil Type- CIO Job Name: Old Town Sol ix cz C5 CIO C100 Job Number 2245c S.I. IMM ON 0W a95 1.00 Date. 3131115 Cmcree OrnvNiaY xlc 0.. 0.W 095 Im By. DSF Rm 90% ON 0.00 0% I.00 c 40% 050 0.00 0.50 0.03 I pquap„q le wY) 0% 0Is 0.00 0.15 0.19 1.N4-P., (C/0..I) 0% 025 000 0,25 0.3+ ,Ii p no 10% 0" 0.00 0.11 au Anmaa rm n% 5W 0.0o 0,20 ozs Basin Desi Date I (%) _ - -. a"k IV, I (%I Runoff COetfs Bean Name Design Point A. +0e4n (Sf) A_, (a!) A.nd (al) Amw (at) Alimi (Sf) Am. wB (si() P""ewla ed) () A, =aail (>t) A1ae (10) ATON (ac) lnlp (%1 C2 CS C10 C100 +. 1 2 U56 37 2.093 0.05 98% 0.94 0.00 0,94 0,99 -- 2 t0, 796 259 11.045 0,25 98% 0.93 0.00 0.0 0.98 n. 3 1,649 498 2,147 0.05 n% 0.79 0.00 0.79 0.84 .A 4 525 525 0.01 100% 0.95 0.00 0.95 1,00 A, 5 751 98 849 0.02 88% 0.87 0,00 0.87 0.92 •, 6 1675 224 1.899 0.04 88% 0.87 0,00 0.87 0.92 A6 7 582 582 0.01 100% 0.95 0.00 0.95 1.00 A7 8 1.364 1,364 0.03 100% 0.95 0.00 0.95 1.00 A8 9 859 859 0.02 100% 0.95 0.00 am 1.00 A9 10 740 bar 1.247 0.03 59% aS7 0.00 0.67 072 AID 11 5ADD 5.400 0.12 100% 0.95 0,00 0.95 IaD All 12 277 118 395 0.01 70% 0.74 0.00 0.74 079 Al: 13 2038. 2.038 0.05 100% 0.95 0.00 0.95 1.00 Ai, .1 601 601 0.01 100% 0.95 0.00 0.96 1,00 A14 15 1_863 1,863 0.04 100% 0,95 0,00 0.95 1.00 A15 16 4710 4.710 0.11 100% 0.95 0.00 0.95 1.00 A16 17 3. 780 3.780 0.09 1Di 0-96 0.00 0.95 1.D0 A17 I 228 228 0,01 100% 0.95 0,00 0.95 1.00 AIR 19 1.387 1.381 0.03 100% 0.95 0.00 0.95 1.00 A19 110 1.897 1.897 0,04 100% 0.95 0,00 0.95 1,00 OS-2 21 374 374 0.01 100% 0.95 0.00 0.95 1.00 A20 22 1337 1.337 0.03 t00% 0.95 0.00 0.95 1.00 06-3 21 1571 3,571 0.08 100% 0.95 0.00 0.95 100 A21 ij 1.235 1.235 0.03 100% 0.95 0.00 0.96 1.00 2389 2.389 0.05 100% 0.95 0,00 0.95 1.00 476 476 001 100% 0.95 am 095 1.00 J 626 626 0.01 100% 00 000 095 1.DO 502 502 0.01 Iw% 0,95 0.00 0.95 IN TOTAL SITE 53.672 0 0 0 0 0 0 1,741 55,413 1.27 96,9% 0,93 0.00 0.93 0.98 2245c - Rational CalmlationsAu Developed C Page I of I II JVA Incorporated Job Name: Old Town Square 25 Old Town Square Job Number: 2245c ' „J/"//„"' Fort Collins. CO 80524 `Y ME WA ` Ph: 970.225.9099 Fax: 970.225.6923 Date: 3131/15 By: DSF Old Town Square Time of Concentration Calculations ' Location: Fort Collins Minor Design Storm:W/O� Major Design Storm:Soil Type: Sub -Basin Data Initial Overland Time (4) Travel Travel Time (4) 4 Comp Ic Urbanized Check 4 x 60) ON Final Basin Design A,� , �.,,. 4 Velocity 4 Time of Total Name Point CS rYpe of Land Surface Cv Corp Length Min (ac) (min) c (fps) (min) 10 (min) 6' 4' 4 (it) 4 Al 1 0.05 0.00 �. 14,6 - Paved areas & shallow 20 0.0 0.0 14.6 62 10.3 10.3 paved swales OS-1 2 0.25 0,00 12.9 Paved areas & shallow 20 2.0 24 15.3 345 11-9 11.9 paved swales A2 3 0.05 0.00 12.1 1,,. 0 0"° Paved areas & shallow 20 0.0 0.0 12.1 69 104 10Aswales A3 4 0.01 0.00 9A 0 0% Paved areas & shallow 20 0.0 0.0 9.4 26 10.1 9.4 paved swales 5 0-02 0.00 - _ 9.0 0.0". Paved areas & skiA4 20 OA 0.0 9.0 38 10.2 9.0 oaved swales AS 6 . 004 0.00 d c 7.9 001, Paved areas & shallow 20 0.0 0.0 7.9 44 10.2 7.9 paved swales A6 7 0.01 0.00 .' 1 7 1,• 7.0 :7 0.0's. Paved areas & shallow 20 0.0 D.0 7.0 21 10.1 TOaved swales A7 8 0.03 0.00 -. 8.8 0 0.0" Paved areas & shallow 20 20 0.0 0.0 8.8 42 10.2 8.8 oaved swales A8 9 0.02 0.00 - 18.1 0 0", Paved areas & shallow 20 0.0 0.0 18.1 51 10.3 10.3 oaved swales A9 10 0.03 0.00 �'. 6.0 O.6S.. Paved areas & shallow 20 1.5 0.2 6.2 27 10.2 6.2 oaved swales A10 11 0.12 0.00 a; S'. 12.7 �. 0.819 Paved areas & shallow 20 1,8 0.3 130 79 104 104 paved swales All 12 0-01 0.00 o'. 7.5 i 1 i1, 0% Paved areas & shallow 20 0.0 0.0 7.5 14 10.1 Z5 paved swales A72 13 0.05 0.00 `i - 10.6 Paved areas & shallow 20 0-0 0.0 10.6 36 10.2 10.2 paved swales A73 14 0.01 0.00 13.8 I' Paved areas & shallow 20 0.0 0.0 13.8 21 10.1 10.1 oaved swales A14 15 0,04 0.00- 8.1 Paved areas & shallow 20 0.0 0.0 8.1 14 10.1 8.1 oaved swales A15 16 0.11 0.006.5 5�� 1 =�'. Paved areas & shallow 20 1.4 0.7 7.2 71 10.4 T2 paved swales A16 17 0.09 0.00 °�� ZO +- Paved areas & Shallow 201.4 0.6 7.5 64 10.4 7.5 Paved swales A17 18 0.01 0.00 t -"-- 4_7 ' Paved areas & shallow 20 0.0 0.0 4.7 7 10.0 5.0 Paved swales A18 19 0.03 0.00 ..� x'- 9.5 _ Paved areas & shallow 20 0.0 0.0 9.5 28 10.2 9.5 Paved swales A19 20 0.04 0.00 1,, I 1^,. 6,8 :, Paved areas & shallow 20 2.4 0.2 7.0 41 10.2 7.0 paved swales OS-2 21 0,01 0.00 2, I ` '-- 9.2 Paved areas & shallow 20 0.0 0A 9.2 27 10.2 9.2 paved swales A20 22 0.03 0.00 la 1 6 Paved areas & shallow 20 2.3 0.2 6.6 47 10.3 6.6 paved paved swales OS-3 21 0,08 0.00 - ! J 12.6 Paved areas & shallow 20 2.8 0.5 13A 138 10.8 10.8 Paved swales A21 23 0.03 0.00 .... 11.1 Paved areas & shallcw 20 0.0 0.0 11.1 19 10A 10.1 aved swales A22 24 0.05 0.00 aJ 114 Paved areas & shallow 20 0.0 0.0 11.4 42 10.2 10.2 paved swales A23 25 0.01 0.00 la it J-„ 10 - Paved areas & shallow,2 20 0.0 0.0 10.2 14 10.1 10.1 Paved swales A24 26 0.01 0.00 ., -14^ 11.6 Paved areas & shallow 20 0.0 0.0 11.6 18 10.1 10A paved swales 27 0.01 0.00 I2 10.9 Paved areas & shallowA25 20 0.0 0.0 log 16 10.1 101 paved swales 2245c - Rational Calculation lsx Developed Tc Page 1 of 1 U JVA Incorporated 25 Old Town Square Job Name: Job Number: Old Town Square .11'"„peo" tJtJtlll Fort Collins, CO 80524 Ph: 970.225-9099 Date: By: 3/3 /15 DSF Fax: 970.225.6923 Old Town Square Developed Storm Runoff Calculations Design Storm : 10 Year I Point Hour Rainfall (PI) 1.40 Direct Runoff Total Runoff o A m m 0 U to E ¢ c UTO u - A! 1 0.05 0.94 10.30 0.05 3.74 0.17 10.30 0.05 3.74 0.17 A2 3 0.05 0.79 10.40 0.04 3.72 0.14 10.40 0.04 3.72 0.14 A3 4 0.01 0.95 9.40 0.01 3.87 0.04 9.40 0.01 3.87 0.04 A4 5 0.02 0.87 9.00 0.02 3.93 0.07 9.00 0.02 3.93 0.07 A5 6 0.04 0.87 7.90 0.04 4.12 0.16 7.90 0.04 4.12 0.16 A6 7 0.01 US 7.00 0.01 4.31 0.05 700 0.01 4.31 0.05 A7 8 0.03 0.95 8.80 1 0.03 3.96 0.12 8.80 0.03 3.96 0.12 A8 9 0.02 0.95 10.30 0.02 3.74 1 0.07 10.30 0.02 3.74 0.07 A9 10 0.03 0.67 6.20 0.02 4.51 0.09 620 0.02 4.51 0.09 A10 11 0.12 0.95 10.40 0.12 3.72 0.44 10.40 0.12 3.72 0.44 A11 12 0.01 0.74 7.50 0.01 4.21 0.03 750 0.01 4.21 0.03 Al2 13 0.05 0.95 10.20 0.04 3.75 0.17 0-04 3.75 0.17 A13 14 0.01 0.95 10.10 0.01 3.77 0.05 - 0.01 3.77 0.05 A14 15 0.04 0.95 8.10 0.04 4.08 0.17 8.IG 0.04 4.08 0.17 A15 16 0.11 0.95 7.20 0.10 4.27 0.44 7.20 010 4.27 0.44 A16 17 0.09 0.95 7.50 0.08 4.21 0.35 7 50 0.08 4.21 0.35 A17 18 0.01 0.95 5.00 0.00 4.87 0.02 5.00 0.00 4.87 0.02 A18 19 0.03 0.95 9.50 0.03 3.86 0.12 9.50 0.03 3.86 0.12 A19 20 0.04 0.95 7.00 0.04 4.31 0.18 7.00 0.04 4.31 0.18 A20 22 0.03 0.95 6.60 0.03 4.41 0.13 1 6.60 0.03 4.41 0.13 A21 23 0.03 0.95 10.10 0.03 3.77 0.10 10 ^. 0.03 3.77 0.10 A22 24 0.05 0.95 10.20 0.05 3.75 0.20 0.05 3.75 0.20 A23 25 0.01 0-95 10-10 0.01 3.77 0.04 0.01 3.77 0.04 A24 26 0.01 0.95 10.10 0.01 3.77 0.05 .. 0.01 3.77 0.05 A25 27 0.01 0.95 10.10 0.01 3.77 0.04 10.10 0.01 3.77 0.04 OS-1 2 0.25 0.93 11.90 0.24 3.51 0.83 11.90 0.24 3.61 0.83 I)S-9 21 0.01 0.95 9.20 0.01 3.90 0.03 9.21] 0.01 3.90 0.03 21 0.08 0.95 10.80 0.08 3.66 0.29 10,30 0.08 3.66 0.29 ' 2245c - Rational Calculations.xlsx O Minor Page 1 of 1 JVA Incorporated Job Name: Old Town Square 25 Old Town Square Job Number: 2245c Fort ns, CO 0524 D /15 Ph: 970225.9099 BY: DSF Fax: 970.225.6923 Old Town Square Developed Storm Runoff Calculations Design Storm 700 Year Point Hour Rainfall (P,) : 2.86 Direct Runoff Total Runoff _C O Z � A 1 0.05 0.99 10.30 0.05 7.63 0.36 0.05 7.63 0.36 A2 3 0.05 0.84 10.40 0.04 7.60 0.31 - 0.04 7.60 0.31 A.3 4 0.01 1.00 9.40 O.D1 7.91 0.10 7.91 0.10 A4 5 0.02 0.92 9.00 0.02 8.03 0.14 9.0u 0.02 8.03 0.14 A5 6 0.04 0.92 7.90 0.04 8.42 0.34 7.90 0.04 8.42 0.34 A6 7 0.01 1.00 7.00 0.01 8.80 0.12 7.00 0.01 8.80 0.12 A7 8 0.03 1.00 8.80 0.03 8.10 0.25 8.80 0.03 8.10 0.25 A8 9 0.02 1.00 10.30 0.02 7.63 0.15 10.30 0.02 7.63 0.15 A9 10 0.03 0.72 6.20 0.02 9.21 0.19 6.20 0.02 9.21 0.19 A10 11 0.12 1.00 10.40 0.12 7.60 0.94 10A0 0.12 7.60 0.94 All 12 0.01 0.79 7.50 0.01 8.59 0.06 7.50 0.01 8.59 0.06 Al2 13 0.05 1.00 10.20 0.05 7.66 0.36 10.20 0.05 7.66 0.36 A 13 14 0.01 1.00 10.10 0.01 7.69 0.11 10.10 0.01 7.69 0.11 A14 15 0.04 1.00 8.10 0.04 8.35 0.36 8.10 0.04 8.35 0.36 A15 16 0.11 1.00 7.20 0.11 8.72 0.94 7.20 0.11 8.72 0.94 A16 17 0.09 1.00 7.50 0.09 8.59 0.75 7.50 0.09 8.59 0.75 A17 18 0.01 1.00 5.00 0.01 9.95 0.05 5.00 0,01 9.95 0.05 A18 19 0.03 1,00 9.50 0.03 7.88 0.25 9-50 0.03 7.88 0.25 A19 20 0.04 1.00 7.00 0.04 8.80 0.38 7.00) 0.04 8.80 0.38 A20 22 0.03 1.00 6.60 0.03 9.00 0.28 6.60 0.03 9.00 0.28 A21 23 0.03 1.00 10.10 0.03 7.69 0.22 10.10 0.03 7.69 0.22 A22 24 0.05 1.00 10.20 0.05 7.66 0.42 10.20 0.05 7.66 0.42 A23 25 0.01 1.00 10.10 0.01 7.69 0.08 10.10 O.C1 7.69 0.08 A24 26 0.01 1.00 10.10 0.01 7.69 0.11 10.10 0.C1 7.69 0.11 A25 27 0.01 1.00 10.10 0.01 7.69 0.09 10.10 O.Ct 7.69 0.09 OS-1 2 0.26 0.98 11.90 0.25 7.19 1.79 11.90 0.25 7.19 1.79 -';2 21 0.01 1.00 9.20 0.01 7.97 0.07 920 0.01 7.97 0.07 21 0.08 1.00 10.80 0.08 7.48 0.61 10.80 0.08 7.48 0.61 2245c - Rational Calculabons.xlsx 0100 Page 1 of 1 �...................� f ......... - -- �' ki i ea•.� r DO Gila .. 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