Drainage Report

Basdin 2-2 without Exfiltration Proposed Basin 2-2 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 15 Summary for Subcatchment 36S: Basin 2-2 [47] Hint: Peak is 371% of capacity of segment #3 Runoff = 5.27 cfs @ 12.17 hrs, Volume= 0.490 af, Depth= 4.17" Routed to Pond 42P : Pond 2-2 Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) CN Description 34,605 98 Paved parking, HSG C 19,780 74 >75% Grass cover, Good, HSG C 7,112 98 Water Surface, 0% imp, HSG C 61,497 90 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.0 60 0.1300 0.34 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.5 120 0.0450 4.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.1 426 0.0350 6.20 1.42 Pipe Channel, 12.0" Round w/ 8.0" inside fill Area= 0.2 sf Perim= 2.2' r= 0.11' n= 0.010 4.6 606 Total, Increased to minimum Tc = 10.0 min