2025 02 Drainage Statement Signed

2025-01 HydroCAD NOAA 24-hr D. 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 42 2025-01 HydroCAD NOAA 24-hr D. 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 43 Hydrograph for Subcatchment 1S: Existing Impervious Time Precip. Excess Runoff | Time Precip. Excess Runoff (hours)_(nehes) inches) (ei) | (houts}_(nches)_(nches) (cfs) 0.00 0.00 0.00 0.00 | 26.00 866 842 0.00 050 0.05 0.00 0.00 | 2650 866 842 0.00 4.00 0.10 0.01 003 | 27.00 866 8.42 0.00 150 0.15 0.04 005 | 2750 866 8.42 0.00 200 021 0.08 007 | 2800 866 842 0.00 250 0.27 0.12 0.08 | 2850 866 842 0.00 300 033 0.17 009 | 2900 866 842 0.00 350 0.39 0.22 010 | 2950 866 842 0.00 4.00 045 0.28 010 | 30.00 866 8.42 0.00 450 0.52 0.34 014 500 059 0.40 0.12 550 066 0.47 0.12 600 074 0.54 0.13 650 082 062 014 700 091 0.71 0.16 750 1.01 0.80 0.18 800 112 © 0.91 0.20 B50 1.24 1.03 0.21 900 137 1.16 0.23 950 163 1.31 0.29 10.00 172 1.49 0.35 1050 1.94 1,71 0.41 11400 225 = 202 0.63 1150 275 281 1.01 1200 415 3.91 4.48 1250 591 5.68 1.39 13.00 641 6.17 0.73 1350 672 6.48 0.47 1400 694 © 6.70 0.37 1450 713 6.89 0.31 15.00 7.29 7.05 0.25 1550 742 7.18 0.22 16.00 7.54 7.30 0.21 1650 765 7.41 0.19 1700 7.75 (7.51 017 1750 7.84 7.60 0.15 1800 792 7.68 014 1850 800 7.76 0.13 19.00 807 7.83 0.13 19.50 814 © 7.90 0.12 20.00 821 7.97 0.12 2050 827 8.03 011 21.00 833 8.09 ont 2150 839 © 8.15 0.10 22.00 845 = 8.21 0.10 22.50 851 8.27 0.10 23.00 856 8,32 0.03 2350 861 8.37 0.03 24.00 8.66 8.42 0.08 2450 866 8.42 0.00 25.00 866 8.42 0.00 25.50 866 8.42 0.00 Summary for Subcatchment 2S: Existing Pervious [49] Hint: To<2dt may require smaller dt Runoff = 157 cis@ 12.11 hrs, Volume= 0.109 af, Depth= 5.04" Routed to Link SL : Existing Total Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs, NOAA 24-hr D_ 100-Year Rainfall=8.66" Area (sf) CN Description 3,045 61 _>75% Grass cover, Good, HSG B 8.244 74 _>75% Grass cover, Good, HSG C 11,289 70 Weighted Average 11,289 100.00% Pervious Area Te Length Slope Velocity Capacity Description (min) (feet) _(f/ft) _(flsec) (cfs) 43 Direct Entry, TC Subcatchment 2S: Existing Pervious Hydrograph Flow (efs) 01234 5.6 7 8 8 101 12 13 14 1 1617 119

e Length Slope Velocity Capacity Description (min) (feet) _(f/ft) _(flsec) (cfs) 43 Direct Entry, TC Subcatchment 2S: Existing Pervious Hydrograph Flow (efs) 01234 5.6 7 8 8 101 12 13 14 1 1617 119 20 21 22 29 24 25-26 27 28 29 30 “Time (hours)