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 7 144507 Page 4 Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 4,346 29,340 22,892 16,829 28,075 sf sf sf sf sf 0.100 0.674 0.526 0.386 0.645 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)= 101,482 sf 73,407 sf 2.33 1.69 ac ac Composite CN = 81 of 19 SJM MJB Final X References Time of Concentration: Sheet Flow 49 L= ft 7.91% % S= n= 0.400 Woods: Light underbrush Shallow Concentrated Flow L= S= 151 ft 0.71% % Unpaved Shallow Concentrated Flow L= 239 ft 2.60% % S= Tc = 11.59 Flows: Current: Q(2) = Q(10) = Q(100) = Short Grass Pasture min Future: Q(2) = Q(10) = Q(100) = 3.49 6.61 13.89 cfs cfs cfs HydroCAD HydroCAD HydroCAD Runoff Volume (Weighted Average Volume): Current: Future: 0.239 ac-ft V(2) = V(2) = V(10) = V(10) = 0.467 ac-ft V(100) = 0.968 ac-ft V(100) = 0.310 0.592 1.284 ac-ft ac-ft ac-ft HydroCAD HydroCAD HydroCAD 2.66 5.20 10.52 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