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 Page 6 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 7: PO-DA 7 Runoff = 3.78 cfs @ 12.11 hrs, Volume= 0.289 af, Depth= 1.61" 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 1,868 98 Impervious, HSG D 85 Yard stone, HSG D 14,410 80 Grass , Good, HSG D 72,265 73 Brush, Good, HSG D 5.406 93,949 81 Weighted Average 92,081 80 98.01 % Pervious Area 1,868 98 1.99% Impervious Area * * * Tc (min) 4.5 Length (feet) 70 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.1600 0.26 Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.8 70 0.0857 Shallow Concentrated Flow, 1.46 Woodland Kv= 5.0 fps 2.4 310 Shallow Concentrated Flow, 0.0200 2.12 Grassed Waterway Kv= 15.0 fps 7.7 450 Total Subcatchment 7: PO-DA 7 Hydrograph i—r 3.78 cfs r~U7T\ iii J Type III 24-hr 2 yr i Rainfall=3.42" Runoff Area=93,949 sf Runoff Volume=0.289 af «J2 o, Runoff Depth=1,61" o5 *2- Flow Length~450' Tc=7.7 min L_J m/mw//mmm 0 1 2 3 4 5 6 7 8 CN=80/98 m/mm/ 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)