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 24 Summary for Subcatchment 5B: PO-DA 5B Runoff = 2.87 cfs @ 12.08 hrs, Volume= 0.225 af, Depth= 4.58" 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" Area (sf) CN Description 16,509 98 Impervious, HSG D 91 Gravel, HSG D 6,800 80 Grass cover, HSG D 2,441 94 Weighted Average 25,750 88 35.89% Pervious Area 9,241 98 64.11% Impervious Area 16,509 * * * Length (feet) 150 Tc (min) 1.1 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 Paved Kv= 20.3 fps 355 Total, Increased to minimum Tc = 6.0 min Paved Kv= 20.3 fps Subcatchment 5B: PO-DA 5B Hydrograph i- - - - - - i- - - - - - - 1- - - - - - i- - - - - - - I i---- 1 L- L _ J 87 cfs : Type III 24-hr 10 yr M Rainfall=5.21" Runoff Area=25,750 sf unoff Volume=0.225 af i Runoff Depth=4.58" : : Flow Length=355' / R / i O LL - i- J - | - L . ] JT<x=6:0min j ! M ! CN=88/98 0 1 2 34 56 78 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tims (hours)