2025 02 Drainage Statement Signed

2025-01 HydroCAD NOAA 24-hr D 2-Year Rainfall=3.44" 2025-01 HydroCAD NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Dynamic Engineering Printed 2/21/2025 Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a sin 08640 © 2024 HydroCAD Software Solutions LLC Page 18 HydroCAD® 10.20-6a sin 08640 © 2024 HydroCAD Software Solutions LLC Page 19 Hydrograph for Subcatchment 4S: Proposed Pervious Summary for Link 5L: Existing Total Time Precip. Excess Runoff Time Precip. Excess Runoff Inflow Area 1.133 ac, 77.12% Impervious, Inflow Depth = 2.70" for 2-Year event (hours) (inches) (inches) (cis) | (hours) (inches) (inches) (cfs) inflow 3.22 cfs @ 12.10 hrs, Volume= 0.254 af 0.00 0.00 0.00 0.00 | 26.00 344 1.08 0.00 = = = a9 8.00 8.00 G00 | 2800 34k 108 6.00 Primary 3.22 cfs @ 12.10hrs, Volume: 0.254 af, Atten= 0%, Lag= 0.0 min 1.00 0.04 0.00 0.00 | 27.00 344 1.08 0.00 = 7 = = ts0 008 (00 ooo | o7s0 344108 00 Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs 200 0.08 0.00 0.00 | 2800 344 1.08 0.00 . a 250 0.11 0.00 0.00 2850 3.44 1.08 0.00 Link 5L: Existing Total 3.00 013 0.00 0.00 | 29.00 344 1.08 0.00 Hydrograph 350 0.15 0.00 000 | 2950 344 1.08 0.00 —_— 400 0.18 + 0.00 0.00 | 30.00 344 1.08 0.00 Tt 450 0.21 0.00 0.00 500 024 0.00 0.00 550 0.26 0.00 0.00 600 0.29 0.00 0.00 3 650 033 0.00 0.00 7.00 0.36 0.00 0.00 750 0.40 0.00 0.00 800 045 0.00 0.00 850 049 0.00 0.00 e2 900 055 0.00 0.00 £ 950 061 0.00 0.00 2 10.00 0.68 0.00 0.00 Fd 1050 0.77 0.00 0.00 11.00 0.89 0.00 0.00 1150 1.09 0.02 0.02 ve 1200 185 0.16 0.17 1250 235 0.45 0.09 13.00 2.55 0.55 0.05 13.50 2.67 0.62 0.03 1400 276 067 0.03 ° sat 1450 283 071 0.02 OLE REE OT BOT DT Me EW 10 10202 BH 26 25 26 27 28 20°30 15.00 289 0.75 0.02 Time (hours) 1550 295 0.78 0.02 16.00 2.99 0.80 0.02 1650 3.04 0.83 0.01 1700 3.08 (0.85 0.01 1750 3110.88 0.01 1800 315 0.90 0.01 1850 3.18 0.91 0.01 19.00 320 0.93 0.01 1950 3.23 0.95 0.01 20.00 326 097 0.01 2050 329 098 0.01 2100 331 1.00 0.01 2150 333 © 1.01 0.01 2200 336 1.03 0.01 22:50 338 1.04 0.01 23,00 3.40 1.06 0.01 2350 342 107 0.01 24.00 3.44 1.08 0.01 2450 344 © 1.08 0.00 25.00 344 1.08 0.00 25.50 3.44 1.08 0.00