J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. Type III 24-hr 10 yr Rainfall=5.21" Printed 3/14/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 1: PO-DA 1 Runoff = 3.57 cfs @ 12.24 hrs, Volume= 0.375 af, Depth= 3.36" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 10 yr Rainfall=5.21" ★ Area (sf) CN Description Impervious, HSG D 98 11,168 Woods/grass comb., Good, HSG D 79 38,971 78 8,088 Meadow, non-grazed, HSG D 58,227 83 Weighted Average 79 47,059 80.82% Pervious Area 11,168 98 19.18% Impervious Area Length Slope Velocity Capacity Description (feet) (ft/ft) (ft/sec) (cfs) 150 0.0270 0.15 Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 1.3 270 0.0520 3.42 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 18.2 420 Total Tc (min) 16.9 Subcatchment 1: PO-DA 1 Hydrograph Ifli i—i il 3.57 cfs : __ ! Typell! 1 I 2|4^hM0;yr f Rairjfall=5.24'f Runoff sf it i i i i iAr£a=58,227 i w\ i ii i R Pi I unoff Volume=0.375 af j Runoff Depth=3.36" i Flow Length=420' i i i Tc=18.2 min — 1- o-l //mmm 0 1 2 3 4 56 7 3 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 20 27 23 29 30 Tima (hours) FT!---- 1 CN=79/98 n