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. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 68 Summary for Subcatchment 2S: EX-DA2 Runoff = 1.34 hrs, Volume3 0.22 cfs @ Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.012 af, Depth3 0.34" Pervious/lmperv., Time Span3 0.00-30.00 hrs, Area (sf) CN Description * * 4,190 10,038 3,705 98 Paved road, HSG D 80 Grass, Good, HSG 73 Brush, Good, HSG D 17,933 13,743 4,190 83 Weighted Average 78 76.64% Pervious Area 98 23.36% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 21.8 150 0.0400 D Description (cfs) Sheet Flow, 0.11 Woods: Light underbrush n= 0.400 P2= 3.42” 1.1 240 0.0630 22.9 390 Total Shallow Concentrated Flow, 3.76 Grassed Waterway Kv= 15.0 fps Subcatchment 2S: EX-DA2 Hydrograph -—i—i—r 0.2! 0.2 -- ------ i—r i “ — r ~ t - -i— T __ I - _ _ _L _ J._ _ _ _ _ __ _ _ _ I_ __ _ _ _I_ 1___ _ _ _ I_ _ _ ___ ___________ _ _ _ t__ I__ I__ 1___ I__ t cmcfsl;::;!;: ---- I------- I1 I Ml 1 0.2 0.12 0.11 NJ DEP 2-hr NJDEP Rainfall=1:.25" unoff Area=:17,933 sf I Rui noff Vplume=0.p11 af 1"1"“ ___ I _ ___I __ i . ------1 _ _ Runoff Depth=0.34’* L _ J _ J - -__I_1__ l_ v : Flow Length=390 iiiiii“iiii Tc=22.9 min ; CN=78/98 ----t - - t - 0.22 0.21 0.19 0.18 0.17 0.16 0.15 0.14 0.13 -i—;—;—i—r - - y- - *■ — i — r- I I I I i 'i tl m ____ L _ J ______ I ____ r -r ■ T“ -i- _i__ i__i _ i— i. i-i rrr -_u _J 0.1 0 09 0.08 0.07 0.06 0.05 0.04 0.03 _ _ i_i__i_ iii t- - _i__j —i__ — r“i —i“ 1 J _____ I - __ L _ J------ l_ L - J 0.02 -r-T”T““r“r-r“n- T ------I ------X---------- 1 ------ _ 1 __ J . _ J ______ I ____I ____L _ J _ f I I I I • I “ r - t - -i —i— r - r 1_ _ i —!_ _ _1 — i _ j __(_ _ _•_ _L_ _ _ ■i— i —r 0.01 234 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