J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Type III 24-hr 100 yr Rainfall=8.72" Printed 3/14/2012 Page 45 Summary for Subcatchment 1: PO-DA 1 0.738 af, Depth= 6.62" 6.98 cfs @ 12.24 hrs, Volume= Runoff = Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description 11,168 38,971 8,088 98 79 78 Impervious, HSG D Woods/grass comb., Good, HSG D Meadow, non-grazed, HSG D 58,227 47,059 11,168 83 79 98 Weighted Average 80.82% Pervious Area 19.18% Impervious Area Tc (min) Slope Length (feet) (ft/ft) 16.9 150 0.0270 Capacity Velocity (ft/sec)(cfs) Description 0.15 Sheet Flow, 3.42 Shallow Concentrated Flow, Grass: Dense n= 0.240 P2= 3.42" 270 0.0520 1.3 Grassed Waterway Kv= 15.0 fps 420 Total 18.2 Subcatchment 1: PO-DA 1 Hydrograph ____________,_____ 6.98 cfs i— r ~ i Type III 24-hr 100 yr Rainfall-8.72" Runoff Area=58,227 sf Runoff Volume=0.738 af Runoff Depth=6.62" Flow Length=420* Tc=18.2 min CN=79/98 w4 ini'll II |I II I| IIII |i nil'll II |fniHHTi|Vii,|<iii|<in,|i, 111.1II I'l II I| IIII|P 0 1 2 3456 78 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)