102 Sams -REV 12-02-25 NOAA 24-hr D 2-Year Rainfall=3.42" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 9
Summary for Subcatchment 181S: DA P6 (Impervious)
Runoff = 0.43 cfs @ 12.10 hrs, Volume= 1,394 cf, Depth= 3.19" Routed to Link 185L : POA
Runoff by SCS TR-20 method, UH=Delmarva, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= NOAA 24-hr D 2-Year Rainfall=3.42"
Area (sf) CN Description
5,250 98 Paved parking, HSG A
5,250 98 100.00% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs)
0.8 100 0.0500 2.05 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42"
0.6 50 0.0050 1.44 Shallow Concentrated Flow, Paved Kv= 20.3 fps
1.4 150 Total
Subcatchment 181S: DA P6 (Impervious)