J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. NJ DEP 2-hrNJDEP Rainfall=1.25" Printed 3/14/2012 Page 70 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 8: PO-DA 8 0.41 cfs@ 1.44 hrs, Volume3 Runoff = 0.025 af, Depth= 0.80" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" Area (sf) CN Description * * 10,980 5.243 98 Impervious, HSG D 85 Yard stone, HSG D 16,223 5,243 10,980 94 Weighted Average 85 32.32% Pervious Area 98 67.68% Impervious Area Slope Velocity Capacity (ft/ft) (ft/sec) Description Tc (min) Length (feet) 30.5 100 0.0030 0.05 Sheet Flow, Yard Stone 1.2 80 0.0030 1.11 Shallow Concentrated Flow, 31.7 180 Total (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps i,A . •A", ' Subcatchment 8: PO-DA 8 Hydrograph T - H - -I 0.49 0.4. 0.4 0.4 0.38 0.38 0.34 0.32 0.3 0.28 0.26 — 0.24 rti L_ i R si; Run i m: 1 0.22 L- u. 0.2 _ J 4- 0.18 0.18 0.14 0.12 -4 NJ DEP 2-hr NJDEP Rainfall-1.25" unoffArea=16,223 sf off Volume=0.025 af Runoff Depth=0.8(T ::i Flow Length=180' Slope=0,0030 T i: Tc=31.7 miri ' T I 1“ CN-85/98 i__ i__i__i iiiiii ------I -----4 0.1 0.08 0.06 0.04 i“ - r - 7 lJ 0.02 r - r " “i L_J i —I cfs - \ i r ~ t i ~ "i - TmsmiMmmfimmsmL 8 9 10 11 12 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 (hours) ;,-v. ' ".f