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 byTRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 42 Summary for Subcatchment 5A: PO-DA 5A Runoff = 5.71 cfs@ 12.08 hrs, Volume= 0.445 af, Depth= 7.32'' 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 15,734 98 Impervious, HSG D 8,318 80 Grass cover, Good, HSG D 7,713 78 Meadow, non-grazed, HSG D 31,765 88 Weighted Average 16,031 79 50.47% Pervious Area 15,734 98 49.53% Impervious Area * * Tc (min) 1.0 Length (feet) 1.50 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0730 2.59 Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" 0.5 135 0.0590 4.93 0.8 180 0.0330 3.69 0.2 34 0.0190 2.80 2.5 499 Paved Kv= 20.3 fps Total, Increased to minimum Tc = 6.0 min Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Subcatchment 5A: PO-DA 5A Hydrograph 4 --------| ------ 1 --------- 1 ------ 1 ------ 1 ------ J _ 5.71 cfs | — l------ 1 _ ----- L _ 1----------- - - X _ J-------------- ----L _ 1------ Z\ __ — — I- v / -U - — R - j - - 1 — ■ ----------- IX _ _ 2 i _ - . i ..■j Type III 24-hr 100 yr Rainfall-8.72” Runoff Area=31,765 sf unoff Volume=0.445 af Runoff Pepth=7.32" Flow Length=499* ! Tc-6.0 min I I CN=79/98 - _ J. _ J________ I___ L ___ - YS/S/s. 1 1 I' m ii |'i m if ii i i p ii i|'ii 234 5678 yi i i i ii i['ll ii n 11 n ii'ii 11 9 10 11 12 13 14 1 5 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)