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 8 144507 Page 5 Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 11,671 0 5,115 0 2,493 sf sf sf sf sf 0.268 0.000 0.117 0.000 0.057 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)= 19,279 sf 16,786 sf 0.44 0.39 ac ac Composite CN = 94 of 19 SJM MJB Final X References Time of Concentration: Gravel Sheet Flow 100 ft L= 1.60% % S= n= 0.100 Gravel Sheet Flow Shallow Concentrated Flow L= S= 78 ft 1.65% % Tc = 7.50 Flows: Current: Q(2) = Q(10) = Q(100) = Unpaved min Future: Q(2) = Q(10) = Q(100) = 1.32 2.14 4.01 cfs cfs cfs HydroCAD HydroCAD HydroCAD Runoff Volume (Weighted Average Volume): Current: Future: 0.091 ac-ft V(2) = V(2) = V(10) = V(10) = 0.151 ac-ft V(100) = 0.273 ac-ft V(100) = 0.110 0.182 0.348 ac-ft ac-ft ac-ft HydroCAD HydroCAD HydroCAD 1.07 1.74 3.09 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