Analysis-Existing Conditions Prepared by Civil Core Consulting HydroCAD® 10.20-7a s/n 13637 © 2025 HydroCAD Software Solutions LLC
NOAA 24-hr D 10 YR-C Rainfall=5.26" Printed 8/29/2025 ons LLC
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Summary for Subcatchment 5S: DA-E3
Runoff = 2.12 cfs @ 12.24 hrs, Volume= 0.321 af, Depth= 1.45" Routed to Link 13L : Reduction
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 10 YR-C Rainfall=5.26"
Area (ac) CN Description
2.080 55 Woods, Good, HSG B
0.130 98 Paved parking, HSG B
0.380 61 >75% Grass cover, Good, HSG B
0.060 98 Roofs, HSG A
2.650 59 Weighted Average
2.460 56 92.83% Pervious Area
0.190 98 7.17% Impervious Area
Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity (cfs) Description
9.1 17 0.0180 0.03 Sheet Flow, Woods: Dense underbrush n= 0.800 P2= 3.42" Using McCuen-Spiess flow length
3.7 222 0.0400 1.00 Shallow Concentrated Flow, Woodland Kv= 5.0 fps
12.8 239 Total
Subcatchment 5S: DA-E3