complete drainage report rev 9

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 113 Summary for Subcatchment 19S: Basin 3 - Imp Runoff = 0.71 cfs @ 12.15 hrs, Volume= Routed to Pond 21P : Basin 3 2,834 cf, Depth= 4.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) 5,876 948 6,824 6,824 * CN 98 98 98 Description Paved parking, HSG C impervious other than pavement Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.3 75 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Sheet Flow (A-B) Subcatchment 19S: Basin 3 - Imp Subcatchment 19S: Basin 3 - Imp Hydrograph 0.8 0.75 0.7 0.65 0.6 0.55 Flow (cfs) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 Runoff 0.71 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=6,824 sf Runoff Volume=2,834 cf Runoff Depth=4.98" Flow Length=75' Slope=0.0400 '/' Tc=8.3 min CN=98 0.1 0.05 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 Time (hours)