complete drainage report rev 9

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 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 20 Summary for Subcatchment 28S: Basin 2 - Imp Runoff = 1.91 cfs @ 12.17 hrs, Volume= Routed to Pond 27P : Basin 2 8,063 cf, Depth= 3.21" 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) 28,866 1,307 30,173 30,173 CN 98 98 98 Description Paved parking, sidewalk, other imp Paved parking, sidewalk other imp Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 93 0.0500 0.17 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 1.5 370 0.0650 4.10 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 10.5 463 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 28S: Basin 2 - Imp