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 M 144507 Page 18 Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 13,651 0 4,808 0 2,493 sf sf sf sf sf 0.313 0.000 0.110 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)= 20,952 sf 18,459 sf 0.48 0.42 ac ac Composite CN = 95 of 19 SJM MJB Final X References Time of Concentration: Gravel Sheet Flow L= 100 ft 1.60% % S= n= 0.100 Gravel Sheet Flow Gravel Shallow Concentrated Flow L= S= 80 ft 1.60% % Tc = 7.39 Flows: WQ = Q(25) = Current: Q(2) = Q(10) = Q(100) = Paved min 0.96 2.35 1.19 1.94 3.42 cfs cfs cfs cfs HydroCAD Future: Q(2) = Q(10) = Q(100) = Runoff Volume (Weighted Average Volume): WQ = 0.030 ac-ft V(25) = 0.205 ac-ft Current: Future: V(2) = 0.102 ac-ft V(2) = V(10) = 0.168 ac-ft V(10) = V(100) = 0.302 ac-ft V(100) = 1.46 2.37 4.42 cfs cfs cfs HydroCAD HydroCAD HydroCAD HydroCAD HydroCAD 0.123 0.202 0.385 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