J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. Printed 3/14/2012 HydroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Page 9 Summary for Subcatchment 9D: PO-DA 9D 0.247 af, Depth= 2.34" 2.55 cfs @ 12.20 hrs, Volume= Runoff = Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 2 yr Rainfall=3.42" * * * Area (sf) CN Description 1,192 98 Impervious, HSG D 16,177 98 Gravel road, HSG D 37,810 85 Yard Stone. HSG D 89 Weighted Average 55,179 37,810 68.52% Pervious Area 85 17,369 31.48% Impervious Area 98 Tc (min) 12.6 Length (feet) 100 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 Slope Velocity (ft/ft) (ft/sec) 0.13 0.0270 Capacity (cfs) Description Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Unpaved Kv= 16.1 fps Subcatchment 9D: PO-DA 9D Hydrograph — 2.55 cfs Type III 24-hr 2 yr * 2 _j Rainfall=3.42' L-J sf Area=55,179 ' l - i l Runoff Runoff Volume=0.247 af Runoff Depth=2.34" Flow Length=350' Tc-14.5 min CN=85/98 0- 12 .............................. I' 11 'I'M II I'" " I' " ' I " ' l P H I l‘M II |1 M I |'l I 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)