J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 50 Summary for Subcatchment 9B: PO-DA 9B Runoff = 5.18 cfs @ 12.28 hrs, Vo!ume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 0.602 af, Depth= 7.34" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * * * 5,504 6,361 30,963 98 Impervious, HSG D 98 Gravel road, HSG D 85 Yard stone, HSG D 42,828 89 Weighted Average 85 72.30% Pervious Area 98 27.70% Impervious Area 30,963 11,865 Tc (min) Length (feet) 19.6 100 0.0090 0.08 1.9 150 0.0066 1.31 21.5 250 Total Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Subcatchment 9B: PO-DA 9B Hydrograph Runoff 5.18 'Trrr; : Type III 24-hr ff00[yr i : i Rainfall=8.72,> Runoff Area=42,828 sf Volume=0.602 af R unoff; ; Runoff Depth=t34" i Flow Length-250' H 1 H Tc=21.5 min !■: I CN=85/98 — ------T -------- — 3 - " T - 7 1 ri i—7 1-1---1 . il'im |^n i| n 0 1 2 34 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) i--- r - r .....................