J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange B_03 01 12 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 5 Summary for Subcatchment 5B: PO-DA 5B Runoff = 1.80 cfs@ 12.08 hrs, Volume= 0.139 af, Depth= 2.83" 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 16,509 98 Impervious, HSG D 6,800 91 Gravel, HSG D 2,441 80 Grass cover, HSG D 25,750 94 Weighted Average 9,241 88 35.89% Pervious Area 98 64.11% Impervious Area 16,509 Tc (min) 1.1 Length (feet) 150 0.3 110 0.0680 5.29 Shallow Concentrated Flow, 0.5 95 0.0260 3.27 Shallow Concentrated Flow, Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0530 2.28 Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Paved Kv= 20.3 fps 1.9 Paved Kv= 20.3 fps 355 Total, Increased to minimum Tc = 6.0 min Subcatchment 5B: PO-DA 5B Hydrograph 1.80 cfs > / / 8 Type III 24-hr 2 yr Rainfall=3.42" Runoff Area=25,750 sf Runoff Volume=0.139 af Runoff Depth=2.83" Flow Length=355' Tc=6.0 min CN=88/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)