J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 52 Summary for Subcatchment 1B: 1B Runoff = 0.17 cfs @ 1.13 hrs, Volume= Runoff by SCS TR-20 method, UH=SCS, Split NJ DEP 2-hrNJDEP Rainfall=1.25" 0.005 af, Depth= 0.32" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * 1,769 6,795 98 78 Impervious, HSG D Meadow, non-grazed, HSG D 8,564 6,795 1,769 82 78 98 Weighted Average 79.34% Pervious Area 20.66% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 2.4 40 0.2500 0.28 0.3 55 0.0360 2.85 2.7 95 Total, Increased to minimum Tc = 6.0 min Sheet Flow, Grass: Dense n= 0.240 P2= 3.42' Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Subcatchment 1B: 1B Hydrograph -—r ~r i .17cfs -i-1,-0.16 0.150.140.13- 0.12_ 0.11- i • i i i _I_ ____ I __L _ J ________ I _____I ___ L _ i _______ I ____ I ___ L _ 1 ______ I ____ ____ I ____ ! _ J > _ I I ____ 1 L _ J l _ _ l L _ i _ J I I 1 I I I l I I _ l ______ I L _ i I 1 L _ i r I I I I 1 I I I I I | NJ DEP 2-hr NJDEP i i fRainfall=i25'' i i l i i .i l I l Runoff Area=8,564 sf ■ r ■ *• v / Runoff Volume=0.005 af t - r - t * "i” ~r ~ r - - *r - r * i - “ - -r “r *■ r - -i* — i — i — r 1 — l — i — r ~ r — i —Runoff Depth=0.32" - | -- — r — i — i ----------------i — r — i --------------r Flow Length=95' - -1-1 - - i 1---------------i ----------------1---------------r - r -------1--------------: 2 : Tc=6.0 min ----U :!: i±: CN=: / _L _ L _ 1 _ _ I I i l t i . J ____ 1 __! __1 . J _ _ t 1 0.1 - i o. r 0.08-. 0.070.060.05- - r - -f— -i-------t- - -i - -*------------1------r - -t —i--------------1------r —- - t --------- 1 -----t — -4— - ------ W — 4 — -4- 0.040.03-; I ___L _ t _ _ 0.02- _____ L _ J _________ I ____( ____L - J . . i - J . . 1 _ J __ I __________ * __________ L - J _______ 0.01o-* 234567 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)