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 76 Summary for Subcatchment 9A: EX-DA 9A Runoff = 0.23 c f s @ 1.50 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, Split 0.015 af, Depth= 0.35" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * 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) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) Tc (min) 31.4 120 0.0040 0.06 Sheet Flow, Yard stone n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph ----- L 1------------------ 1------- l------- I------- X---------- 1------- l------- I------- 1 - -J---------------1------- 1------- ----------------------------------------------------------- S—r —!“ 0.26-fT- ° A 0.23 cfs 0.24-r—r 0.23f • NJ DEP 2-hr NJDEP _ SajrifajliFir.iS'r ----1----(---- I------ )---- 1----1----»• - -I - H------- I---- t---- ♦ - H -— Runoff Area±21,924 sf i i i i i i i i 'i i i i Runoff Volume=O.015 af _L_i L-' Runoff bepth=0.35'' !: i--- i i -r-7 - i Flow Length=120' r i ir n r i r l - -i iSI6pe=Q 0040 7 r r r i TcF3l:4:rhin ii _ i_ —i— CN=J k —i — -i- • »---i t - -« 0.22 r “ t i i r ~ t --|■ - I - - 4 --1 -----1 -----I ------- 4 -------1 -----1 -----H - 4 -------1 ----- ------ - 4 ---------------1 1 ------------ - 4 - - 4 - t * - 4 -----1 ---- » ---- I ------ f ------ » ---- 1 ---- ----------------1 ---- I -----b - 2 0.15-; o. 0.14-j -; » 0.13- L.J i i » - 0.1t0.09 0.08 0.07-j 0.06 0.05 0.040.03- t i i - - i- - 4 t - -i- - -t , iii y - t - - -1— 0.02-: —• —i— *- - -f —i — riiiiriI 0.01 0 1 2 34 56 7 !_ _ j___ . f i ~ ”i” ---- t- - ♦ 1 1 - - I - t I - - I I - - 4 — - I 1 I ~ i f - 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