complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 148 Summary for Subcatchment 46S: Basin 11 - Perv Runoff = 1.52 cfs @ 12.17 hrs, Volume= Routed to Pond 33P : Basin 11 5,482 cf, Depth= 2.72" 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) 7,658 16,544 24,202 24,202 CN 80 74 76 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) 8.9 83 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 0.9 150 0.0330 2.92 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 9.8 233 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 46S: Basin 11 - Perv