Drainage Report

Basin 4 without exfiltration Proposed basin 4 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 20 Time span=0.00-72.00 hrs, dt=0.03 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 16S: Basin 4 Porous pvmt Runoff Area=85,708 sf Runoff Depth=4.29" Flow Length=509' Tc=8.1 min CN=74/98 Runoff=8.03 cfs 0.703 af Subcatchment 18S: OL-4 Runoff Area=11,273 sf Runoff Depth=2.61" Flow Length=96' Slope=0.0573 '/' Tc=8.7 min CN=74/98 Runoff=0.70 cfs 0.056 af Subcatchment 19S: pre-dev basin 4 Runoff Area=96,981 sf Runoff Depth=2.20" Flow Length=190' Tc=15.9 min CN=70/0 Runoff=4.06 cfs 0.408 af Pond 17P: Porous pavement system 4 Peak Elev=589.75' Storage=20,113 cf Inflow=8.03 cfs 0.703 af Outflow=0.70 cfs 0.316 af Total Runoff Area = 4.453 ac Runoff Volume = 1.168 af Average Runoff Depth = 3.15"