J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 75 Summary for Subcatchment 8S: EX-DA 8 Runoff = 0.86 cfs @ 1.41 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.049 af, Depth= 0.55" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * ★ * 15,912 29,261 1.535 98 Impervious, HSG D 85 Yard stone, HSG D 80 Grass, Good, HSG D 46,708 30,796 15,912 89 Weighted Average 85 65.93% Pervious Area 98 34.07% Impervious Area Tc (min) Length (feet) 25.5 80 0.0030 0.05 Sheet Flow, Yard stone 0.5 80 0.0170 2.65 Shallow Concentrated Flow, 2.2 165 0.0060 1.25 Shallow Concentrated Flow, Yard Stone 0.2 60 0.0580 4.89 Shallow Concentrated Flow, Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Unpaved Kv= 16.1 fps Paved Kv= 20.3 fps 28.4 385 Total Subcatchment 8S: EX-DA 8 Hydrograph ~ i.. 0.95 . .1 _ _ 186 cfs _1 __ -L-1-- 0.855 - - - J > - ‘l L. I-.1. . 1 __ l ___ j ____ _ U - L - 4 -------------- 0.7-: . L . J. _ _ _ L _ J __ L*l .1.. 'A 1. _ J „ .j _ _ _ L _ J _ _ .I. 0.65- 0.6- 1 . - 4 ________ 0.55- __ L _ J _ _ _ _ i_ - _ l .. ; . j . . i-_ 0.50 45 . 0.4 ___ L _ 1________ 0.35 0.3 - _ L _ 4 - __ 0.250.25 iiiiiiiiiiii l l ' r. -i - L _ i ------- I — 4 -----L - 1 _ J --------1 ---- I — J , _ J - .i-J.- 0.75- —:—•—•—r~~"" i l i | ■ Runoff l | l - - L _ J _ J _ , 0.8 — L NJ DEP 2-hii NJDEP Rainfall=1.25" Runoff Area=46,708 sf RMnoffVpluiTie=0.p49iajf Runoff Depth=0.55';' Flow Length=385' Tc=28 4 min CN=85/98 _ L _ ' 0.15- •_j 0.1 ___t ___ i - J - - • _______l ___ 1 . J - . d.os- A 1 234 567 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 |