J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2yr Rainfall=3.42" Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 sIn 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 4 n Summary for Subcatchment 2: PO-DA 2 Runoff = 0.83 cfs @ 12.25 hrs, Volume= 0.084 af, Depth= 1.50" 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 2 yr Rainfall=3.42" * * * Area (sf) CN Description 98 Impervious, HSG D 0 0 98 Gravel road, HSG D 9,261 80 Grass, Good, HSG D 19,890 78 Meadow, non-grazed, HSG D 29,151 79 Weighted Average 29,151 79 100.00% Pervious Area Tc (min) 12.1 Length (feet) 120 Slope (ft/ft) 0.0400 Velocity (ft/sec) 0.17 0.3 75 0.0600 3.67 Grass: Dense n= 0.240 P2= 3.42" • • ■ Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 1.9 140 0.0070 1.25 Shallow Concentrated Flow, 1.2 130 0.0150 1.84 Shallow Concentrated Flow, 1.7 360 0.0540 3.49 Shallow Concentrated Flow, 0.4 190 0.0100 7.20 Capacity (cfs) Description Sheet Flow, Grassed Waterway Kv= 15.0 fps Grassed Waterway Kv= 15.0 fps Grassed Waterway Kv= 15.0 fps .* 17.6 1,015 Total 22.62 • i' % Pipe Channel, Culvert to Discharge 24.0" Round Area= 3.1 sf Perim= 6.3’ r= 0.501 n= 0.013 Corrugated PE, smooth interior ; •< , 1 J