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 N 144507 Page 19 Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 9,139 18,653 6,647 22,986 0 sf sf sf sf sf 0.210 0.428 0.153 0.528 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)= 57,424 sf 57,424 sf 1.32 1.32 ac ac Composite CN = 81 of 19 SJM MJB Final X References Time of Concentration: Gravel Sheet Flow L= 100 ft 1.39% % S= n= 0.100 Gravel Sheet Flow Shallow Concentrated Flow L= S= 19 ft 4.80% % Paved Shallow Concentrated Flow L= 28 ft S= 21.78% % Woodland Shallow Concentrated Flow L= 305 ft S= 4.68% % Short Grass Pasture Tc = 10.89 Flows: WQ = Q(25) = Current: Q(2) = Q(10) = Q(100) = min 0.79 5.16 2.06 4.02 8.18 cfs cfs cfs cfs HydroCAD Future: Q(2) = Q(10) = Q(100) = Runoff Volume (Weighted Average Volume): WQ = 0.031 ac-ft V(25) = 0.469 ac-ft Current: Future: V(2) = 0.188 ac-ft V(2) = V(10) = 0.364 ac-ft V(10) = V(100) = 0.752 ac-ft V(100) = 2.75 5.21 11.03 cfs cfs cfs HydroCAD HydroCAD HydroCAD HydroCAD HydroCAD 0.243 0.461 0.998 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