J_2024 05 09_West Orange Stormwater Management Plan

Stormwater Management Plan 2.5 Revision 0 Hydrology and Hydraulics Other Stormwater Conveyance Table 2.8 summarizes the results for the proposed subsurface pipe network, conveying flow for the newly developed areas from the bioretention basins and non-contributory trench drains to the project outfall. Storm drainage piping was designed to accommodate the 25-year storm as required by PSE&G. The subsurface conveyance calculations were conducted using CivilStorm software. Refer to Appendix C for the calculations. Table 2.7: Stormwater Conveyance Results Pipe 25 Year Flow (cfs) SD-01 SD-02 SD-03 SD-04 SD-05 SD-06 SD-07 SD-08 SD-09 SD-10 SD-11 SD-12 SD-21 SD-22 SD-23 SD-24 SD-25 SD-26 5.75 5.75 1.40 7.15 7.15 0.83 7.98 8.22 2.20 10.42 1.75 12.17 5.07 7.85 9.18 10.20 11.42 11.42 Public Service Electric & Gas Company Pipe Length (ft) 31.63 78.00 5.00 19.06 38.91 5.00 18.81 135.70 5.00 83.62 5.00 158.11 64.50 127.26 93.73 111.26 262.39 29.44 Diameter (in) Slope (%) 12” dia. 12” dia. 12” dia. 12” dia. 18” dia. 12” dia. 18” dia. 18” dia. 12” dia. 18” dia. 12” dia. 18” dia. 12” dia. 12” dia. 15” dia. 15” dia. 15” dia. 18” dia. 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.50 1.50 1.50 1.50 1.50 1.50 2-8 25 Year Velocity (ft/s) 7.32 7.32 4.27 9.10 9.10 3.70 6.57 6.56 4.77 5.90 4.52 6.89 6.46 9.99 11.69 12.99 14.54 14.54 Full Flow Capacity (cfs) 3.58 3.54 3.56 3.56 3.57 3.56 10.56 10.48 3.56 10.53 3.56 10.50 4.37 4.36 4.35 4.36 4.37 4.36 Burns & McDonnell