J_2024 05 09_West Orange Stormwater Management Plan

Post-Developed (25-Year) West Orange HydroCAD_Post NOAA 24-hr D 25-Year Rainfall=6.44", P2=3.42" Prepared by Burns & McDonnell HydroCAD® 10.20-4b s/n 08510 © 2023 HydroCAD Software Solutions LLC Printed 5/13/2024 Page 7 Time span=0.00-24.00 hrs, dt=0.0100 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 4S: PO-DA B Runoff Area=28,575 sf 0.00% Impervious Runoff Depth>3.52" Flow Length=298' Tc=13.4 min CN=WQ Runoff=2.09 cfs 0.192 af Subcatchment 5S: PO-DA C Runoff Area=24,698 sf 17.46% Impervious Runoff Depth>4.91" Flow Length=164' Tc=18.6 min CN=WQ Runoff=2.09 cfs 0.232 af Runoff Area=6,403 sf 0.00% Impervious Runoff Depth>3.86" Flow Length=85' Slope=0.1773 '/' Tc=7.6 min CN=WQ Runoff=0.62 cfs 0.047 af Subcatchment 6S: PO-DA D Subcatchment 7S: PO-DA E Runoff Area=15,246 sf 31.71% Impervious Runoff Depth>5.10" Flow Length=175' Tc=15.6 min CN=WQ Runoff=1.42 cfs 0.149 af Runoff Area=3,746 sf 0.00% Impervious Runoff Depth>3.69" Flow Length=66' Slope=0.2264 '/' Tc=5.6 min CN=WQ Runoff=0.38 cfs 0.026 af Subcatchment 8S: PO-DA F Subcatchment 9S: PO-DA G Runoff Area=16,902 sf 28.87% Impervious Runoff Depth>5.03" Flow Length=175' Tc=23.4 min CN=WQ Runoff=1.30 cfs 0.163 af Runoff Area=10,281 sf 0.00% Impervious Runoff Depth>3.48" Flow Length=82' Slope=0.1736 '/' Tc=7.5 min CN=WQ Runoff=0.92 cfs 0.068 af Subcatchment 10S: PO-DA H Subcatchment 11S: PO-DA I Runoff Area=10,507 sf 27.64% Impervious Runoff Depth>5.03" Flow Length=120' Tc=6.5 min CN=WQ Runoff=1.30 cfs 0.101 af Runoff Area=13,809 sf 38.48% Impervious Runoff Depth>5.14" Flow Length=96' Slope=0.0336 '/' Tc=5.4 min CN=WQ Runoff=1.79 cfs 0.136 af Subcatchment 12S: PO-DA J Subcatchment 13S: PO-DA K Runoff Area=4,400 sf 30.68% Impervious Runoff Depth>4.47" Flow Length=239' Tc=14.4 min CN=WQ Runoff=0.37 cfs 0.038 af Subcatchment 14S: PO-DA L Runoff Area=7,972 sf 0.00% Impervious Runoff Depth>3.56" Flow Length=116' Tc=11.1 min CN=WQ Runoff=0.63 cfs 0.054 af Reach 3R: TD-01 Avg. Flow Depth=0.10' Max Vel=4.21 fps Inflow=0.62 cfs 0.047 af n=0.012 L=67.2' S=0.0298 '/' Capacity=30.28 cfs Outflow=0.62 cfs 0.047 af Reach 4R: TD-02 Avg. Flow Depth=0.07' Max Vel=3.42 fps Inflow=0.38 cfs 0.026 af n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs Outflow=0.38 cfs 0.026 af Reach 5R: TD-03 Avg. Flow

.62 cfs 0.047 af Reach 4R: TD-02 Avg. Flow Depth=0.07' Max Vel=3.42 fps Inflow=0.38 cfs 0.026 af n=0.012 L=34.0' S=0.0279 '/' Capacity=29.34 cfs Outflow=0.38 cfs 0.026 af Reach 5R: TD-03 Avg. Flow Depth=0.23' Max Vel=2.60 fps Inflow=0.92 cfs 0.068 af n=0.012 L=133.7' S=0.0044 '/' Capacity=11.66 cfs Outflow=0.91 cfs 0.068 af Reach 6R: TD-04 Avg. Flow Depth=0.12' Max Vel=3.49 fps Inflow=0.63 cfs 0.054 af n=0.012 L=54.6' S=0.0163 '/' Capacity=22.41 cfs Outflow=0.63 cfs 0.054 af Pond 1P: BR-01 Peak Elev=600.60' Storage=3,897 cf Inflow=2.09 cfs 0.232 af Outflow=0.45 cfs 0.229 af