POST DEV NOAA 24-hr D 10 YEAR Rainfall=5.38" Prepared by Professional Design Services Printed 12/31/2025 HydroCAD® 10.20-6a s/n 02223 © 2024 HydroCAD Software Solutions LLC Page 34
Summary for Subcatchment 8S: PROP WAREHOUSE BLDG
[49] Hint: Tc<2dt may require smaller dt
Runoff = 2.35 cfs @ 12.10 hrs, Volume= 0.179 af, Depth> 4.66" Routed to Pond 9P : SSIB #3 UNDERGROUND
Runoff by SCS TR-20 method, UH=Delmarva, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10 YEAR Rainfall=5.38"
Area (ac) CN Description
0.460 98 Roofs, HSG A
0.460 100.00% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description
1.5 100 0.0100 1.08 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42"
0.3 40 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps
0.8 140 3.00 Direct Entry, PIPE FLOW
2.6 280 Total
Subcatchment 8S: PROP WAREHOUSE BLDG