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 28 Summary for Subcatchment 9C: PO-DA 9C Runoff = 4.13 cfs @ 12.20 hrs, Volume= 0.412 af, Depth= 4.09" 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 1,117 98 Impervious, HSG D 98 Gravel road, HSG D 18,457 85 Yard stone, HSG D 33,086 52,660 90 Weighted Average 33,086 85 62.83% Pervious Area 19,574 98 37.17% Impervious Area ★ * it Tc (min) 12.6 Length (feet) 100 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0270 0.13 Description 1.1 160 0.0220 2.39 Shallow Concentrated Flow, Yard Stone 1.3 120 0.0085 1.48 Shallow Concentrated Flow, Yard Stone 15.0 380 Total Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Unpaved Kv= 16.1 fps Subcatchment 9C: PO-DA 9C Hydrograph i i iiii 4.13 cfs — _ 1 1 1 C2 0 1 2 3 4 56 7 8 i i—i---------- r i Type III 24-hr 10 yr i ; Rainfall=5.21M unoff Area=52,660 sf R Run loff Volume=0,412 af Runoff Depth=4.09" FI6W Len^th4380; Tc-15Ldrriiri i ! ! : i CN=85/98 i r« 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours) f