2022 10 Drainage Statement Signed

5 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 2 Existing Site (Pervious) Hydrograph type = SCS Runoff Peak discharge = 0.221 cfs Storm frequency = 2 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 694 cuft Drainage area = 0.210 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 2.00 min Total precip. = 3.44 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Existing Site (Pervious) Q (cfs) Q (cfs) Hyd. No. 2 -- 2 Year 0.50 0.50 0.45 0.45 0.40 0.40 0.35 0.35 0.30 0.30 0.25 0.25 0.20 0.20 0.15

0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 2