Swales: TTT
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It is recommended that swales be modelled as a 'Swale', which has it's own menu button in the TTT. For detailed scenarios of enhanced swales, the weir element can be incorporated for checkdams. The alternative is to use the 'enhanced swale' within the LID toolbox, but this incorporates fewer design parameters.
| Name | User-assigned swale name |
| Upstream Node | Name of node on the inlet end of the swale (which is normally the end at higher elevation) |
| Downstream Node | Name of node on the outlet end of the swale (which is normally the end at lower elevation) |
| Length (m) | Length of the swale |
| Manning's Roughness | Manning's roughness coefficient |
| Upstream Invert Offset (m) | Depth of swale invert above node invert at inlet end of the swale |
| Downstream Invert Offset (m) | Depth or elevation of the swale invert above the node invert at the outlet end of the swale |
| Depth (m) | Depth of the swale |
| Bottom Width (m) | Bottom width of the trapezoidal swale (i.e., open channel) For a triangular channel, enter 0 |
| Left Side Slope (m/m) | Left side slope (run/rise) |
| Right Side Slope (m/m) | Right side slope (run/rise) |
| Seepage (mm/hour) | Rate of seepage loss into the surrounding soil |
The TTT also includes an 'enhanced swale' element within the LID toolbox. In version 1.0 this element does not incorporate checkdams and doesn't account for any infiltration capacity.
| Surface | |
|---|---|
| Berm height (mm) | This is the height of the curb which constrains the overland sheet flow of water. Where the bottom of the slope discharges directly into another LID facility without impedance, the value is 0. |
| Surface roughness (Manning’s n) | Lower numbers indicate less surface obstruction and result in faster flow. Suggested range for mown grass (dependent on density) 0.03 – 0.06 [1] |
| Surface slope (%) | If the slope > 3%, consider using small Checkdams or weirs to permit temporary ponding, increase infiltration, and slow flow to reduce erosion. |
| Swale side slopes (run/rise) | Suggested value of 3 or 4 if design permits Enhanced swales |
- ↑ Oregon State Univ., Corvallis. Dept. of Civil, Construction and Environmental Engineering.; Environmental Protection Agency, Cincinnati ONRMRL. Storm Water Management Model Reference Manual Volume I Hydrology (Revised). 2016:233.https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100NYRA.txt Accessed August 23, 2017.