J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Prepared byTRC Engineers, Inc. Type III 24-hr 10 yr Rainfall=5.21" Printed 3/14/2012 Page 27 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 7: PO-DA 7 Runoff = 7.39 cfs @ 12.11 hrs, Volume= 0.560 af, Depth= 3.11” 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 10 yr Rainfall=5.21” Area (sf) CN Description 98 Impervious, HSG D 1,868 14,410 85 Yard stone, HSG D 80 Grass , Good, HSG D 72,265 5,406 73 Brush, Good, HSG D 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 0.8 70 Slope Velocity (ft/ft) (ft/sec) 0.1600 0.26 Capacity (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.0857 Shallow Concentrated Flow, 1.46 Woodland Kv= 5.0 fps 2.4 310 7.7 450 Shallow Concentrated Flow, 0.0200 2.12 Grassed Waterway Kv= 15.0 fps Total Subcatchment 7: PO-DA 7 Hydrograph 39 Cfs Type III 24-hr 10 yr Rainfall=5.21" 6- Runoff Area=93,949 sf : Runoff Volume=0.560 af tv Runoff Depth=3.11" r - 7 - -i 3 a 4 __ j. ii ' Flow Length=450' i i i i w i _i___________________ i___j_ i. i i i Tc=7.7 min CN=80/98 ft. mmmmm 0 1 2 3 4 I ■"Mf"" .. .................................... II n II 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) 'mmr