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 6 144507 3 Page Made By Checked By Preliminary Land Use Impervious, Pavement >75% Grass cover, Good Yard Stone/Gravel Pad Brush, Good Non-Contributory 18,485 9,771 53,605 14,992 30,878 sf sf sf sf sf 0.424 0.224 1.231 0.344 0.709 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)= 127,731 sf 96,853 sf 2.93 2.22 ac ac Composite CN = 85 19 of SJM MJB Final X References Time of Concentration: Sheet Flow 100 ft L= 5.43% % S= n= 0.400 Woods: Light underbrush Shallow Concentrated Flow L= S= 67 ft 9.08% % Short Grass Pasture Shallow Concentrated Flow L= 43 ft S= 28.13% % Short Grass Pasture Shallow Concentrated Flow L= 281 ft S= 0.69% % Unpaved Tc = 16.99 Flows: Current: Q(2) = Q(10) = Q(100) = min Future: Q(2) = Q(10) = Q(100) = 4.50 8.07 16.29 cfs cfs cfs HydroCAD HydroCAD HydroCAD Runoff Volume (Weighted Average Volume): Current: Future: 0.377 ac-ft V(2) = V(2) = V(10) = 0.693 ac-ft V(10) = V(100) = 1.369 ac-ft V(100) = 0.477 0.863 1.791 ac-ft ac-ft ac-ft HydroCAD HydroCAD HydroCAD 3.45 6.35 12.28 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