J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Printed 3/14/2012 Page 67 Prepared by TRC Engineers, Inc. HydroCAP® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 2: PO-DA 2 0.009 af, Depth= 0.15" 0.17 cfs@ 1.33 hrs, Volume= Runoff = Runoff by SCS TR-20 method, UH=SCS, Split NJ DEP 2-hr NJDEP Rainfall=1.25" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * * * 0 0 9,261 19,890 98 Impervious, HSG D 98 Gravel road, HSG D 80 Grass, Good, HSG D 78 Meadow, non-grazed, 29,151 29,151 79 Weighted Average 100.00% Pervious Area 79 Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) 12.1 120 0.0400 0.17 0.3 75 0.0600 3.67 Shallow Concentrated Flow, 1.9 140 0.0070 1.25 Shallow Concentrated Flow, 1.2 130 0.0150 1.84 1.7 360 0.0540 3.49 0.4 190 0.0100 7.20 HSG D Capacity (cfs) Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Grassed Waterway Kv= 15.0 fps Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 22.62 Pipe Channel, Culvert to Discharge 24.0" Round Area= 3.1 sf Perim= 6.3' r- 0.50' n= 0.013 Corrugated PE, smooth interior 17.6 1,015 Total