J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. Printed 3/14/2012 HydroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Page 43 Summary for Subcatchment 5B: PO-DA 5B Runoff = 4.95 cfs @ 12.08 hrs, Volume= 0.396 af, Depth= 8.05" 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 100 yr Rainfall=8.72" * * * Area (sf) CN Description ------------------ 1------------------------------------------------------------98 Impervious, HSG D 16,509 6,800 91 Gravel, HSG D 2,441 80 Grass cover, HSG D 94 Weighted Average 25,750 88 35.89% Pervious Area 9,241 98 64.11% Impervious Area 16,509 Tc (min) 1.1 Length (feet) 150 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0530 2.28 Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" 0.3 110 0.0680 5.29 Shallow Concentrated Flow, 0.5 95 0.0260 3.27 Shallow Concentrated Flow, 1.9 355 Paved Kv= 20.3 fps Total, Increased to minimum Tc = 6.0 min Paved Kv= 20.3 fps Subcatchment 5B: PO-DA 5B Hydrograph -—- 4.95 cfs 5 / rrw 5 6 Type III 24-hr 100 yr Rainfall=8.72" Runoff Area=25,750 sf Runoff Volume=0.396 af Runoff Depth-8.05" Flow Length=355' Tc=6.0 min CN=88/98 I |J II 11*11 II I'll M I' HTffTIl |*IMpHI |1 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) A