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 3
Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points
Runoff by SCS TR-20 method, UH=Delmarva, Split Pervious/Imperv. UI as Pervious
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 141S: DA P1 (Impervious) Runoff Area=31,625 sf 100.00% Impervious Runoff Depth=3.19"
Flow Length=450' Tc=3.0 min CN=0/98 Runoff=2.34 cfs 8,398 cf
Subcatchment 143S: DA P2 (Impervious) Runoff Area=23,470 sf 100.00% Impervious Runoff Depth=3.19"
Flow Length=450' Tc=4.9 min CN=0/98 Runoff=1.53 cfs 6,233 cf
Subcatchment 145S: DA P5 (4000 SF Roof) Runoff Area=4,000 sf 0.00% Impervious Runoff Depth=3.19"
Tc=6.0 min CN=98/0 Runoff=0.24 cfs 1,062 cf
Subcatchment 148S: DA P3 (Pervious) Runoff Area=62,973 sf 0.00% Impervious Runoff Depth=0.01"
Flow Length=316' Slope=0.0200'/' Tc=13.1 min CN=39/0 Runoff=0.00 cfs 28 cf
Subcatchment 149S: DA P0 Pervious Runoff Area=336,250 sf 0.00% Impervious Runoff Depth=0.00"
Flow Length=679' Tc=49.8 min CN=33/0 Runoff=0.00 cfs 0 cf
Subcatchment 150S: DA P4 (Pervious) Runoff Area=76,971 sf 0.00% Impervious Runoff Depth=0.01"
Flow Length=196' Slope=0.0100'/' Tc=14.8 min CN=39/0 Runoff=0.00 cfs 34 cf
Subcatchment 172S: DA P6 (Impervious) Runoff Area=5,250 sf 100.00% Impervious Runoff Depth=3.19"
Flow Length=150' Tc=1.4 min CN=0/98 Runoff=0.43 cfs 1,394 cf
Pond 130P: SUBSURFACE Peak Elev=1.35' Storage=277 cf Inflow=0.24 cfs 1,062 cf
Outflow=0.04 cfs 1,062 cf
Pond 144P: WQ Infiltration Basin #1 Peak Elev=95.51' Storage=2,258 cf Inflow=2.34 cfs 8,433 cf
Discarded=0.33 cfs 8,433 cf Primary=0.00 cfs 0 cf Outflow=0.33 cfs 8,433 cf
Pond 149P: WQ Infiltration Basin #2 Peak Elev=92.02' Storage=3,026 cf Inflow=1.53 cfs 6,261 cf
Discarded=0.08 cfs 6,261 cf Primary=0.00 cfs 0 cf Outflow=0.08 cfs 6,261 cf
Link 147L: POA Inflow=0.43 cfs 1,394 cf Primary=0.43 cfs 1,394 cf
Total Runoff Area = 540,539 sf Runoff Volume = 17,150 cf Average Runoff Depth = 0.38"
88.84% Pervious = 480,194 sf 11.16% Impervious = 60,345 sf