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HomeMy WebLinkAboutWPO201500068 Other 2015-09-10 (2) U.S.Department of Agriculture FL-ENG-21C Natural Resources Conservation Service 06/04 TR 55 Worksheet 4:Graphical Peak Discharge Method Project: WPO Plan for SWM Facility#1(SB conversion) Designed By: FGM,PE Date: 9/15/2015 Location: Hollymead Town Center Checked By: SRC,PE Date: 9/15/2015 Check One: Present X Developed X Drainage Area Drainage Area Drainage Area Drainage Area 1.Data Description Description Description Description DAA DAA (Present) (Developed) Drainage Area(Am)in miles2= 0.0202 _ _ 0.0202 Runoff curve number CN= 57 82 Time of concentration (Tc)= 0.30 0.25 Rainfall distribution type= II II Pond and swamp areas spread 0 0 • throughout the watershed= 2.Frequency-years 1 2 1 2 3.Rainfall, P(24 hour)-inches 3.50 3.7 3.50 3.7 4.Initial Abstraction,la-inches 1.503 1.503 0.447 0.447 5.Compute la/P 0.43 0.41 0.13 0.12 6.Unit peak discharge,Qu-csm/in 425 450 700 700 7.Runoff,Q from Worksheet 2-inches 0.42 0.50 1.76 1.93 8.Pond and Swamp adjustment factor;Fp 1 1 1 1 9.Peak Discharge,Qp-cfs Routed Through where Qp=Qu Am Q Fp 3.60 4.52 SWM Facility Watershed Summary Pre-Development Future Post-Development Area 1-Year Outfall 2-Year Outfall Area 1-Year Outfall 2-Year Outfall Description (acres) CN (cfs) (cfs) (acres) CN (cfs) (cfs) DAA 12.94 57.1 3.60 4.52 , 12.94 81.7 0.62 1.64 Yik.+PA ?eg, VC 210-66 oJ cm,,,NqL VKINEraotA. co4coNAPPro 110,4 sKALL . --tig0 A .S":WPM tv CatNAM`f A:4CE- S9 51-S.,`"‘ kt43 °Ma an' Ci2.11C1,7".4A Sh-4 0;.k t'a F.„fe c.5t, S IAN/, „,A.ket,) sw.t,w `,k fi. 1140:74A ,,)\a‘.11.71..Q124N:Ari,,N).\ ZSH fs SITOPPA,,,,4K1 ER. Co Nve , 1X VA MLM ?.-.1*Ac• .01 IMAA, • /0, "Vitt tANN,} cro.41,1).: ot scIkLA TO 0"ri-v\AEA w-t arn-acarl sc. otz • cmAy.imv,v) wv-v.4.c ,MN rfsrroP- kk4 > ix. iw 0.i tiNit iAt. `...td4 tw.$,E., 0,LM'11,‘ vto4 . (riNtwor43 V\S CI,on) VIDAYZAACrt' a *R. IR'CS f 3 , ? ? 1\/3\ ." r..C.A[k• Qç . OttreijeVATI 64‘4aC. INCL.140CS. ZA''V R144K4`-' PC-AN 00\Aumv,p4 • C4W,gx -7: • HTC Sediment Basin Conversion- SWM Facility No. 1 UPDATED RISER BasinFlow printout INPUT: Basin: HTC Sediment Basin Conversion- SWM Facility No. 1- UPDATED RISER 6 Contour Areas Elevation(ft) Area(sf) Computed vol . (cy) 521.00 19560.00 0.0 522.00 21655.00 762.9 523.00 23703.00 1602.6 524.00 25839.00 2519.7 525.00 27775.00 3512.4 526.00 30136.00 4584.5 Start_Elevation(ft) 521.00 Vol . (cy) 0.00 5 Outlet Structures Outlet structure 0 Orifice name: Proposed Barrel area (sf) 3.142 diameter or depth (in) 24.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 518.000 multiple 1 discharge out of riser Outlet structure 1 Orifice name: Low Flow orifice area (sf) 0.049 diameter or depth (in) 3.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) , 521.000 multiple 1 discharge into riser Outlet structure 2 Orifice name: Mid Flow Orifice area (sf) 0.049 diameter or depth (in) 3.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 522.600 multiple 1 discharge into riser Outlet structure 3 weir name: Proposed Riser diameter (in) 36.000 side angle 0.000 coefficient 3.300 • invert (ft) 523.600 multiple 1 discharge into riser transition at (ft) 0.912 orifice coef. 0.500 orifice area (sf) 7.069 Page 1 HTC Sediment Basin Conversion- SWM Facility No. 1 UPDATED RISER Outlet structure 4 Weir name: Proposed Emergency Spillway length (ft) 70.000 side angle 71.565 coefficient 3.300 invert (ft) 524.600 multiple 1 discharge through dam 4 Inflow Hydrographs Hydrograph 0 SCS name: 1-yr 24-hr Peak SCS TR-55 Method Storm Event Area (acres) 12.940 CN 81.700 Type 2 rainfall , P (in) 3.500 time of conc. (hrs) 0.2500 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 23.153 peak time (hrs) 12.003 volume (cy) 3058.579 Hydrograph 1 SCS name: 2-yr 24-hr Peak SCS TR-55 Method Storm Event Area (acres) 12.940 CN 81.700 Type 2 rainfall , P (in) 3.700 time of conc. (hrs) 0.2500 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 25.330 peak time (hrs) 12.003 volume (cy) 3346.101 Hydrograph 2 SCS name: 10-yr 24-hr Peak SCS TR-55 Method Storm Event Area (acres) 12.940 CN 81.700 Type 2 rainfall , P (in) 5.600 time of conc. (hrs) 0.2500 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 47.233 peak time (hrs) 12.003 volume (cy) 6239.581 Page 2 • HTC Sediment Basin Conversion- SWM Facility No. 1 UPDATED RISER Hydrograph 3 SCS name: 100-yr 24-hr Peak SCS TR-55 Method Storm Event Area (acres) 12.940 CN 81.700 Type .2 rainfall , P (in) 9.100 time of conc. (hrs) 0.2500 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 90.402 peak time (hrs) 12.003 volume (cy) 11942.307 OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1-yr 24-hr Peak SCS TR-55 Method Storm Event inflow (cfs) 23.125 at 12.00 (hrs) discharge (cfs) 0.620 at 13.80 (hrs) water level (ft) 523.625 at 13.78 (hrs) storage (cy) 2166.379 Hydrograph 1 Routing summary of Peaks: 2-yr 24-hr Peak SCS TR-55 Method Storm Event inflow (cfs) 25.299 at ' 12.00 (hrs) discharge (cfs) 1.643 at 12.90 (hrs) water level (ft) 523.710 at 12.92 (hrs) storage (cy) 2245.390 Hydrograph 2 Routing Summary of Peaks: 10-yr 24-hr Peak SCS TR-55 Method Storm Event inflow (cfs) 47.175 at 12.00 (hrs) discharge (cfs) 27.974 at 12.14 (hrs) water level (ft) 524.530 at 12.14 (hrs) storage (cy) 3037.242 Hydrograph 3 Routing Summary of Peaks: 100-yr 24-hr Peak SCS TR-55 Method Storm Event inflow (cfs) 90.291 at 12.00 (hrs) discharge (cfs) 86.265 at 12.04 (hrs) water level (ft) 524.983 at 12.04 (hrs) storage (cy) 3494.778 Tue Sep 15 15:49:53 EDT 2015 Page 3