J_2024 05 09_West Orange Stormwater Management Plan

Client Project # Project Name PSE&G Date 03/29/23 West Orange Switching Station PO-DA E 144507 Page 10 Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 4,845 2,044 8,385 0 0 sf sf sf sf sf 0.111 0.047 0.192 0.000 0.000 ac ac ac ac ac D D D D D CN = CN = CN = CN = CN = 98 80 85 73 0 Total Area (TA)= TA (less non contributory)= 15,274 sf 15,274 sf 0.35 0.35 ac ac Composite CN = 88 of 19 SJM MJB Final X References Time of Concentration: Gravel Sheet Flow L= 100 ft 0.30% % S= n= 0.100 Gravel Sheet Flow Shallow Concentrated Flow L= S= 75 ft 0.55% % Tc = 14.46 Flows: WQ = Q(25) = Current: Q(2) = Q(10) = Q(100) = Unpaved min 0.37 1.42 0.65 1.14 2.14 cfs cfs cfs cfs HydroCAD Future: Q(2) = Q(10) = Q(100) = Runoff Volume (Weighted Average Volume): WQ = 0.015 ac-ft V(25) = 0.149 ac-ft Current: Future: V(2) = 0.067 ac-ft V(2) = V(10) = 0.119 ac-ft V(10) = V(100) = 0.228 ac-ft V(100) = 0.84 1.44 2.83 cfs cfs cfs HydroCAD HydroCAD HydroCAD HydroCAD HydroCAD 0.084 0.147 0.295 ac-ft ac-ft ac-ft HydroCAD HydroCAD HydroCAD https://burnsmcd.sharepoint.com/sites/PSEGSub/Shared Documents/WestOrange26kVLifecyclePrelim_144507/Dsgn/Sub/Civil/Storm_Wtr/6. 5/10/2024 4:13 PM Storm Water Management Report/Appendix A - Design Notes/Archived/West Orange Design Notes_Blake.xlsx