102 Sams -REV 12-02-25 NOAA 24-hr D 100-Year Rainfall=9.48" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 15
Summary for Subcatchment 124S: DA E3 (Impervious)
Runoff = 2.30 cfs @ 12.10 hrs, Volume= 7,882 cf, Depth= 9.24" Routed to Link 141L : 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 100-Year Rainfall=9.48"
Area (ac) CN Description
0.192 98 Unconnected pavement, HSG A
0.043 98 Paved parking, HSG A
0.235 98 Weighted Average
0.192 98 81.70% Pervious Area
0.043 98 18.30% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description
1.2 100 0.0200 1.42 Sheet Flow,
Shallow Concentrated Flow, Paved Kv= 20.3 fps
1.6 195 Total
1.6 195 Total
0.4 95 0.0475 4.42 Smooth surfaces n= 0.011 P2= 3.42"
Subcatchment 124S: DA E3 (Impervious)