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 C 144507 Page 8 Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 4,299 2,396 17,985 0 0 sf sf sf sf sf 0.099 0.055 0.413 0.000 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)= 24,680 sf 24,680 sf 0.57 0.57 ac ac Composite CN = 87 of 19 SJM MJB Final X References Time of Concentration: Gravel Sheet Flow L= 100 ft 0.18% % S= n= 0.100 Gravel Sheet Flow Shallow Concentrated Flow L= S= 64 ft 1.06% % Tc = 17.10 Flows: WQ = Q(25) = Current: Q(2) = Q(10) = Q(100) = Unpaved min 0.44 2.09 0.93 1.67 3.18 cfs cfs cfs cfs HydroCAD Future: Q(2) = Q(10) = Q(100) = Runoff Volume (Weighted Average Volume): WQ = 0.020 ac-ft V(25) = 0.232 ac-ft Current: Future: V(2) = 0.101 ac-ft V(2) = V(10) = 0.184 ac-ft V(10) = V(100) = 0.359 ac-ft V(100) = 1.21 2.13 4.23 cfs cfs cfs HydroCAD HydroCAD HydroCAD HydroCAD HydroCAD 0.128 0.228 0.467 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