J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared byTRC Engineers, Inc. Printed 3/14/2012 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 72 Summary for Subcatchment 9D: PO-DA 9D Runoff = 1.43 cfs @ 1.22 hrs, Volume= 0.056 af, Depth= 0.53" 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 * ★ * 1,192 16,177 37,810 98 Impervious, HSG D 98 Gravel road, HSG D 85 Yard Stone, HSG D 55,179 37,810 17,369 89 Weighted Average 85 68.52% Pervious Area 98 31.48% Impervious Area Slope Velocity Capacity (ft/ft) (ft/sec) Description Tc (min) Length (feet) 12.6 100 0.0270 0.13 Sheet Flow, Yard Stone 0.8 120 0.0270 2.65 Shallow Concentrated Flow, Yard Stone 1.1 130 0.0140 1.90 Shallow Concentrated Flow, Yard Stone 14.5 350 Total (cfs) n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Unpaved Kv= 16.1 fps Subcatchment 9D: PO-DA 9D Hydrograph —Ii I—i — i —i —i —f —i —i — i— -----i ----r 1 -- 1 --- i -1 ----- | — I ---- i------ i 1 ! 1 l 1 1 1 1 1 1 1 I I 1 l ! I I .4 3 cfe 1 1 1 .1 1 1 ) 1 I I 1 1 1 1 I 1 1 I 1 1 1 1 I I - . 1 --1 1 1 1 I I 1 1 1 1 1 1I 1I I I 1 1 Rainfallf 1.251* Runoff Area-55,179 sf Runoff Volume=0.056 af Runoff Depth=0.53" Flow Length=350' iii»i iiii i Tc=14i5 min CN=85/98 0 1 2 3 4 5 6 7 8 9 1 0 1 13 1 14 151 16217 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours) t 1 1 1 1 1 1 1