J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Type III 24-hr 100 yr Rainfall=8.72" Printed 3/4/2012 Page 46 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: EX-DA2 Runoff = 1.94 cfs@ 12.30 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, 0.227 af, Depth= 6.63" Split Pervious/lmperv., Time Span= 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 0.11 1.1 240 0.0630 3.76 22.9 390 Total D Description (cfs) Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Subcatchment 2S: EX-DA2 Hydrograph 1.94 cfs - •» —i - iI ! Type III 24-lir iDOlyr i Rainfall=8.72" Rundff Arda-17,933 sf unoff; Volume=0.227; af ] ftunoff t)epth=6|^3^ : : Flow Length-390’ i i ii ii i w i i ii Tc=22.9mih CN=78/98 ? ° t—) 2 3 4 5 8 7 59 11 12 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 (hours) dt= 0.01 hrs