J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Printed 3/4/2012 Page 11 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: EX-DA 8 Runoff = 1.65 cfs@ 12.40 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.212 af, Depth= 2.37" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description h * h 15,912 29,261 1,535 98 Impervious, HSG D 85 Yard stone, HSG D 80 Grass, Good, HSG D 46,708 30,796 15,912 89 Weighted Average 85 65.93% Pervious Area 98 34.07% Impervious Area Tc (min) Length (feet) 25.5 80 0.0030 0.05 Sheet Flow, Yard stone 0.5 80 0.0170 2.65 Shallow Concentrated Flow, 2.2 165 0.0060 1.25 Shallow Concentrated Flow, Yard Stone 0.2 60 0.0580 4.89 Shallow Concentrated Flow, 385 Total Slope Velocity (ft/ft) (ft/sec) Capacity (cfs) Description n= 0.250 P2= 3.42" Paved Kv= 20.3 fps Unpaved Kv= 16.1 fps Paved Kv= 20.3 fps 28.4 Subcatchment 8S: EX-DA 8 Hydrograph i—:-1—;-. ;------- ----i--------: 1.65 cfs I Type III 24-hr 2|yr i Rainfall=3.42" Runoff Area=46,708 sf Run4ffVol!ura?d0.?12iaf *5 1- i : Runoff Depth=2.37" : Flow Length=385' i ii ii iii “ i i ii ; i Tc=28.4 min : CN=85/98 "7* 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