2025 12 19 Stormwater Report Rev 1

6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 2 DA-1 Impervious Hydrograph type = SCS Runoff Peak discharge = 7.590 cfs Storm frequency = 2 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 36,568 cuft Drainage area = 3.320 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 13.60 min Total precip. = 3.47 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 Shape factor - Baginski = 484 - Manor - West Orange DA-1 Impervious Q (cfs) Q (cfs) Hyd. No. 2 -- 2 Year 8.00 8.00 6.00 6.00 4.00 4.00 2.00 2.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 2