J_2024 05 09_West Orange Stormwater Management Plan

PSE&G Client Project # Project Name Date 03/29/23 West Orange Switching Station PO-DA 1 144507 2 Page Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 7,888 19,498 2,304 23,117 0 sf sf sf sf sf 0.181 0.448 0.053 0.531 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)= 52,807 sf 52,807 sf 1.21 1.21 ac ac Composite CN = 80 19 of SJM MJB Final X References Time of Concentration: Sheet Flow 23 L= ft 3.52% % S= n= 0.011 Smooth surfaces Shallow Concentrated Flow L= S= 31 ft 24.37% % Woodland Shallow Concentrated Flow L= 287 ft S= 4.62% % Tc = 3.65 Flows: Current: Q(2) = Q(10) = Q(100) = Short Grass Pasture min Future: Q(2) = Q(10) = Q(100) = 3.19 6.07 12.86 cfs cfs cfs HydroCAD HydroCAD HydroCAD Runoff Volume (Weighted Average Volume): Current: Future: V(2) = V(2) = 0.167 ac-ft V(10) = V(10) = 0.327 ac-ft V(100) = V(100) = 0.682 ac-ft 0.217 0.416 0.908 ac-ft ac-ft ac-ft HydroCAD HydroCAD HydroCAD 2.45 4.81 9.80 cfs cfs cfs 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