complete drainage report rev 9

Existing Conditions NOAA 24-hr D 10-Year Rainfall=5.22" 2024-04-20 HydroCAD - Existing Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 21 Summary for Subcatchment 4S: DA 2 - Perv Runoff = 33.11 cfs @ 12.26 hrs, Volume= Routed to Link 2L : DA 2 147,700 cf, Depth= 2.45" 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 10-Year Rainfall=5.22" Area (sf) 399,842 36,590 257,004 28,750 722,186 722,186 CN 70 74 77 80 73 Description Woods, Good, HSG C >75% Grass cover, Good, HSG C Woods, Good, HSG D >75% Grass cover, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.9 100 0.0450 0.11 Sheet Flow, Sheet Flow (A-B) Woods: Light underbrush n= 0.400 P2= 3.47" 1.9 564 0.0920 4.88 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 16.8 664 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 4S: DA 2 - Perv