J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 12 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9A: EX-DA 9A 0.65 cfs @ 12.45 hrs, Volume3 Runoff = Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.085 af, Depth3 2.02" Pervious/lmperv., Time Span3 0.00-30.00 hrs, Area (sf) CN Description * * Tc (min) 1,344 20.580 98 85 Paved road, HSG D Yard stone, HSG D 21,924 20,580 1,344 86 85 98 Weighted Average 93.87% Pervious Area 6.13% Impervious Area Length (feet) 31.4 Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 120 0.0040 0.06 Sheet Flow, Yard stone n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph i _ _i_ _ i_ *i i r 0.7 0.65 Cfs — i. - -----i-jar-— 0.650.6 --L-1 0.55 0.5- - 0.45- . 0.4 * 0.35 0.3 -.L_J - -i __ L _ J______ 0.25 0.2 0.15 —i — iii - * I 1 » 4 I 1 l- ~ 4 I 1 _ 4- I • Type III 24-hr 2iyr Rainfall-3.42” RunoffArea-21,924; sf Runoff :V6lume=0.Q85; af : Runoff Depth=i.02';' Flow Length=120’ Slope-0.0040 T : ; | Tc=31.4 min CN=85/98 0.1 0.05 ‘rrrr^iTTft u i|*ii m |4i n ift u i|*n u p irifl rnfti u ft mft inftm ft n >ft il 1 234 5 67 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) dt= 0.01 hrs