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 D 144507 Page 9 Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 0 3,662 0 2,759 0 sf sf sf sf sf 0.000 0.084 0.000 0.063 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)= 6,421 6,421 sf sf 0.15 0.15 ac ac Composite CN = 77 of 19 SJM MJB Final X References Time of Concentration: Sheet Flow 85 L= ft 17.73% % S= n= 0.400 Tc = 6.98 Flows: WQ = Q(25) = Current: Q(2) = Q(10) = Q(100) = Woods: Light underbrush min 0.04 0.62 0.23 0.48 1.01 cfs cfs cfs cfs HydroCAD Future: Q(2) = Q(10) = Q(100) = Runoff Volume (Weighted Average Volume): WQ = 0.002 ac-ft V(25) = 0.047 ac-ft Current: Future: V(2) = 0.017 ac-ft V(2) = V(10) = 0.036 ac-ft V(10) = V(100) = 0.078 ac-ft V(100) = 0.31 0.63 1.38 cfs cfs cfs HydroCAD HydroCAD HydroCAD HydroCAD HydroCAD 0.023 0.046 0.106 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