Area Listing (all nodes) - 33862 - Post (Attachment 8)
Technical stormwater management report (HydroCAD) providing post-development runoff analysis and pond system summaries for the development site.
33862 - Post
Prepared by {enter your company name here} HydroCAD® 10.00-26 s/n 09943 © 2020 HydroCAD Software Solutions LLC Printed 2022-04-25
Area Listing (all nodes)
| Area (hectares) | CN | Description (subcatchment-numbers) |
|---|---|---|
| 0.1385 | 98 | Paved parking, HSG B (1S) |
| 0.0212 | 65 | Woods/grass comb., Fair, HSG B (1S) |
| 0.1597 | 94 | TOTAL AREA |
33862 - Post
Type II 24-hr 10-yr Post-Development Rainfall=84 mm Prepared by {enter your company name here} HydroCAD® 10.00-26 s/n 09943 © 2020 HydroCAD Software Solutions LLC Printed 2022-04-25
Summary for Subcatchment 1S: Post-Development
Runoff = 0.01043 m³/s @ 12.32 hrs, Volume= 0.107 Ml, Depth= 67 mm
Runoff by SCS TR-20 method, UH=Gamma-150, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Post-Development Rainfall=84 mm
| Area (ha) | CN | Description |
|---|---|---|
| 0.1385 | 98 | Paved parking, HSG B |
| 0.0212 | 65 | Woods/grass comb., Fair, HSG B |
| 0.1597 | 94 | Weighted Average |
| 0.0212 | 13.27% Pervious Area | |
| 0.1385 | 86.73% Impervious Area |
| Tc (min) | Length (meters) | Slope (m/m) | Velocity (m/sec) | Capacity (m³/s) | Description |
|---|---|---|---|---|---|
| 10.0 | Direct Entry, | ||||
| 10.0 | 0.0 | Total, Increased to minimum Tc = 30.0 min |
33862 - Post
Type II 24-hr 10-yr Post-Development Rainfall=84 mm Prepared by {enter your company name here} HydroCAD® 10.00-26 s/n 09943 © 2020 HydroCAD Software Solutions LLC Printed 2022-04-25
Summary for Pond 2P: SWM System
- Inflow Area = 0.1597 ha, 86.73% Impervious, Inflow Depth = 67 mm for 10-yr Post-Development event
- Inflow = 0.01043 m³/s @ 12.32 hrs, Volume= 0.107 Ml
- Outflow = 0.00399 m³/s @ 13.95 hrs, Volume= 0.075 Ml, Atten= 62%, Lag= 98.0 min
- Primary = 0.00399 m³/s @ 13.95 hrs, Volume= 0.075 Ml
Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Peak Elev= 1.649 m @ 13.95 hrs Surf.Area= 32.0 m² Storage= 52.8 m³
Plug-Flow detention time= 233.5 min calculated for 0.075 Ml (70% of inflow) Center-of-Mass det. time= 133.9 min ( 976.6 - 842.8 )
| Volume | Invert | Avail.Storage | Storage Description |
|---|---|---|---|
| #1 | 0.000 m | 64.0 m³ | 4.00 mW x 8.00 mL x 2.00 mH Prismatoid |
| Device | Routing | Invert | Outlet Devices |
|---|---|---|---|
| #1 | Primary | 1.000 m | 38 mm Vert. Orifice/Grate C= 1.000 |
Primary OutFlow Max=0.00399 m³/s @ 13.95 hrs HW=1.649 m (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.00399 m³/s @ 3.52 m/s)