J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 Type III 24-hr 10 yr Rainfall=5.21" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 22 Summary for Subcatchment 4: PO-DA 4 Runoff = 3.04 cfs @ 12.15 hrs, Volume= 0.265 af, Depth= 3.47" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 10 yr Rainfall=5.21" ★ * h Area (sf) CN Description 98 4,334 Impervious, HSG D 98 Gravel road, HSG D 5,398 Grass cover, Good, HSG D 14,366 80 78 Meadow, non-grazed, HSG D 15.808 84 39,906 Weighted Average 30,174 79 75.61% Pervious Area 24.39% Impervious Area 9,732 98 Tc (min) 9.6 Length (feet) 100 0.5 Description Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0500 0.17 Sheet Flow, 120 0.0830 4.32 Shallow Concentrated Flow, 0.7 145 0.0480 3.29 Shallow Concentrated Flow, 10.8 365 Total Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Grassed Waterway Kv= 15.0 fps Subcatchment 4: PO-DA 4 Hydrograph •' ' ' * '* I I I Runoff! 3.04 cfs I 2 0 1 2 34 56 78 _ i___ — t— R Ru _ j — i— —i — i__ i—i —i_____ i__ i. : Type III 24-hr 10 yr i Rainfall-5.21" Runoff Area=39,906 sf noff Volume=0.265 af Runoff Depth=3.47" : Flow Length=365' : : i Tc=10.8 min CN= 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours)