J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Printed 3/4/2012 Page 3 Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EX-DA 1 Runoff = 2.43 cfs @ 12.25 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.258 af, Depth= 1.70" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description h h 11,158 661 53,293 14,189 98 98 79 73 Paved road, HSG D Gravel road, HSG D Woods/grass comb., Good, HSG D Brush, Good, HSG D 79,301 67,482 11,819 81 78 98 Weighted Average 85.10% Pervious Area 14.90% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 16.9 150 0.0270 0.15 Sheet Flow, 1.3 270 0.0520 3.42 Shallow Concentrated Flow, 18.2 420 Total Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Subcatchment 1S: EX-DA 1 Hydrograph 2.43 cfs i■ 01 2 34 - 56 78 L_J _L ; ; Type III 24-hr 2 yr -U-J-i-i Ralnfall=3.42" Runoff Area=79,301 sf Runoff; Volume=0.258 af : Runoff Depth=1.70H : Flow Length=420’ Tc=18.2 min CN=78/98 l*m 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