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 10 yr Rainfall=5.21" Printed 3/4/2012 Page 33 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9A: EX-DA 9A Runoff = 1.17 cfs@ 12.42 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 10 yr Rainfall=5.21" UH=SCS, Split 0.153 af, Depth= 3.65" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * Tc (min) 31.4 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) 120 0.0040 0.06 Sheet Flow, Yard stone n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph 1.17 cfs r "T 78 Type III 24-hr 10 yr r : r Rainfall=5.21” Runoff Area=21,924 sf Runoff Volume=0.153 af Runoff Depth=3.65^' Flow Length-120’ Slope=0.0040 V I Tc=31.4 min CN-85/98 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