2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_s/n 08840 © 2021 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Basin B - Perv. Runoff = 3.92 cfs @_12.17 hrs, Volume= 0.333 af, Depth= 5.52" Routed to Pond 4P : Basin B Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) CN Description, 31,571__74__>75% Grass cover, Good, HSG C. 31,571 100.00% Pervious Area Te Length Slope Velocity Capacity Description (min) (feet) _(ftft)_(f/sec) (cfs) 10.0 Direct Entry, Direct Subcatchment 5S: Basin B - Perv. Hydrograph NOAA 24-hr D 100-Year Rainfall=8.66" a Runoff Area=31,571 sf Runoff Volume=0.333 af Runoff Depth=5.52" * Tc=10.0 min CN=74 Flow (cfs) 0-2-4 6 8 WIZ Ia 16 18M 22 24 25 28 90 92 34 95 38.40 42 44 AG 48 80 52 O4 98 58.60 62 64 66 68 70 72 Time (hours) 2022-07-28 Proposed Hydrology NOAA 24-hr D100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 9/5/2022 HydroCAD@ 10.20-2d sin 08640 © 2021 HydroCAD Software Solutions LLC Page 116 Time Precip. (hours) (inches) 0.00 0.00 1.00 0.10 200 0.21 3.00 0.33 4.00 0.45 5.00 0.69 6.00 0.74 7.00 0.91 800 1.12 900 1.37 10.00 1.72 14.00 2.25 1200 4.15 43.00 6.41 14.00 6.94 15.00 7.29 16.00 7.54 47.00 7.75 18.00 7.92 19.00 8.07 20.00 3.21 21.00 8.33 22.00 8.45 23.00 8.568 24.00 8.66 25.00 8.66 26.00 8.66 27.00 8.66 28.00 8.66 29.00 8.66 30.00 8.66 31.00 8.66 32.00 8.66 33.00 8.66 34.00 8.68 35.00 8.66 36.00 8.66 37.00 8.66 38.00 8.66 39.00 8.66 40.00 8.66 41.00 8.66 4200 8.66 43.00 8.66 44.00 8.66 45,00 8.66 46.00 8.66 47.00 8.66 48.00 8.66 49.00 8.66 50.00 8.66 51.00 8.66 Hydrograph for Subcatchment 5S: Basin B - Perv. Time Precip. Excess Runoff