J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 ©2009 HydroCAD Software Solutions LLC Type III 24-hr 10 yr Rainfall=5.21" Printed 3/14/2012 Page 23 Summary for Subcatchment 5A: PO-DA 5A Runoff = 3.13 cfs @ 12.09 hrs, Volume= 0.241 af, Depth= 3.97" 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 15,734 98 Impervious, HSG D 8,318 80 Grass cover, Good, HSG D 7,713 78 Meadow, non-grazed, HSG D 88 Weighted Average 31,765 79 50.47% Pervious Area 16,031 15,734 98 49.53% Impervious Area Tc (min) 1.0 Length (feet) 150 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0730 2.59 0.5 Description Sheet Flow, 135 0.0590 4.93 Shallow Concentrated Flow, 0.8 180 0.0330 3.69 Shallow Concentrated Flow, 0.2 34 0.0190 2.80 Shallow Concentrated Flow, 2.5 499 Paved Kv= 20.3 fps Total, Increased to minimum Tc = 6.0 min Smooth surfaces n= 0.011 P2= 3.42” Paved Kv= 20.3 fps Paved Kv= 20.3 fps Subcatchment 5A: PO-DA 5A Hydrograph 3.13 cfs / / / / 2- Type III 24-hr 10 yr Rainfall=5.21" Runoff Area=31,765 sf Runoff Volume=0.241 af Runoff Depth=3.97" Flow Length=499' Tc=6.0 min CN=79/98 vmmmt 1 2 3 4 5 6 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)