2026-02 Offsite Stability
Prepared by Dynamic Engineering
HydroCAD® 10.20-8a s/n 08640 © 2025 HydroCAD Software Solutions LLC
Printed 2/10/2026
Page 7
| Pipe Listing (selected nodes) |
| Line# | Node Number | In-Invert (feet) | Out-Invert (feet) | Length (feet) | Slope (ft/ft) | n | Width (inches) | Diam/Height (inches) | Inside-Fill (inches) | Node Name |
|---|
| 1 | 16S | 0.00 | 0.00 | 207.0 | 0.0100 | 0.010 | 0.0 | 8.0 | 0.0 | |
| 2 | 18S | 0.00 | 0.00 | 297.0 | 0.0035 | 0.011 | 0.0 | 15.0 | 0.0 | |
| 3 | 19S | 0.00 | 0.00 | 297.0 | 0.0035 | 0.011 | 0.0 | 15.0 | 0.0 | |
| 4 | 17P | 117.50 | 117.40 | 22.0 | 0.0045 | 0.013 | 0.0 | 15.0 | 0.0 | |
2026-02 Offsite Stability NOAA 24-nt D 25-Year Rainfall=0.68 , P2=4.04
Prepared by Dynamic Engineering Printed 2/10/2026
HydroCAD® 10.20-8a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 8
Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=Delmarva, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment16S: Study Area Roof (Imp) Runoff Area=0.110 ac 100.00% Impervious Runoff Depth=6.44" Flow Length=207' Slope=0.0100 /" Tc=10.0 min CN=98 Runoff=0.46 cfs 0.059 af
Subcatchment18S: Study Area WQ MTD Runoff Area=0.610 ac 100.00% Impervious Runoff Depth=6.44" Flow Length=352' Tc=10.0 min CN=98 Runoff=2.55 cfs 0.327 af
Subcatchment19S: Study Area WQ MTD Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=0.66" Flow Length=351' Tc=10.0 min CN=39 Runoff=0.00 cfs 0.001 af
Pond 17P: Basin A Routing (StormBrixx) Peak Elev=120.31' Storage=8,183 cf Inflow=3.02 cfs 0.388 af Outflow=1.06 cfs 0.300 af
Link 18L: Study Area Study Area WQ MTD A-110 (Total) Inflow=2.56 cfs 0.329 af Primary=2.56 cfs 0.329 af
Link 19L: Study Area Basin A (Total) Inflow=3.02 cfs 0.388 af Primary=3.02 cfs 0.388 af
Total Runoff Area = 0.740 ac Runoff Volume = 0.388 af Average Runoff Depth = 6.28
Total Runoff Area = 0.740 ac Runoff Volume = 0.388 af Average Runoff Depth = 6.28"
2.70% Pervious = 0.020 ac 97.30% Impervious = 0.720 ac