complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 38 Summary for Subcatchment 36S: DA 2 Und - Perv Runoff = 3.80 cfs @ 12.18 hrs, Volume= Routed to Link 34L : DA 2 Undetained 13,855 cf, Depth= 1.39" 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 2-Year Rainfall=3.44" Area (sf) 52,227 67,725 119,952 119,952 CN 80 74 77 Description >75% Grass cover, Good, HSG D >75% Grass cover, Good, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.5 100 0.0500 0.18 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.3 60 0.0600 3.94 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 9.8 160 Total Sheet Flow (A-B) Subcatchment 36S: 2 Und - Perv SCF DA (B-C)