J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange B_03 01 12 Printed 3/14/2012 Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Pggeg Summary for Subcatchment 6: PO-DA 6 Runoff = 4.52 cfs @ 12.19 hrs, Volume= 0.427 af, Depth= 1.81" 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) 13,009 47,083 39,774 853 22,963 123,682 110,673 13,009 * ★ ★ CN Description 98 Impervious, HSG D 85 Yard stone, HSG D 80 Grass cover, Good, HSG D 78 Meadow, non-grazed, HSG D 73 Brush, Good, HSG D 82 Weighted Average 81 89.48% Pervious Area 98 10.52% Impervious Area Tc Length Slope Velocity (min) (feet) (ft/ft) (ft/sec)(cfs) 100 0.0500 0.17 9.6 Capacity Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.3 80 0.0880 4.45 0.2 40 0.3130 2.80 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.2 30 0.0330 2.92 Shallow Concentrated Flow, 4.0 296 0.0060 1.25 Shallow Concentrated Flow, Yard stone 14.3 546 Total Unpaved Kv= 16.1 fps Un paved Kv= 16.1 fps