Soil water retention curve (Water Overlay): Difference between revisions
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|unit= | |unit= | ||
|range=0 to 1 | |range=0 to 1 | ||
|description=Setting a Soil Water Retention Curve | |description=Setting a Soil Water Retention Curve adjusts the vertical hydraulic conductivity in the Unsaturated Zone. | ||
|defaultvalue=0 | |defaultvalue=0 | ||
|icon= | |icon= | ||
}}</onlyinclude>}} | }}</onlyinclude>}} | ||
When this attribute is set to <code>1</code>, the vertical hydraulic conductivity is calculated using the Van Genuchten-Mualem formula: | |||
: <math>K(\theta) = K_s \cdot \sqrt{S_e} \cdot (1 - ( 1 - S_e^n )^m )^2</math> | : <math>K(\theta) = K_s \cdot \sqrt{S_e} \cdot (1 - ( 1 - S_e^n )^m )^2</math> | ||
Where: | Where: | ||
: <math>K(\theta)</math> = | : <math>K(\theta)</math> = The calculated vertical hydraulic conductivity for the given saturation | ||
: <math>K_s</math> = | : <math>K_s</math> = The saturated vertical hydraulic conductivity from [[Terrain ground infiltration md (Water Overlay)|Terrain ground infiltration md]]. | ||
: <math>S_e</math> = | : <math>S_e</math> = The effective saturation between 0-1 of the Unsaturated Zone. This is a fraction between Sr (assumed close to zero) and the [[Terrain_water_storage_percentage_(Water_Overlay)|Water storage percentage]]. | ||
: <math>n</math> = <math>1 / m</math> | : <math>n</math> = <math>1 / m</math> | ||
: <math>m</math> = [[Terrain_van_genuchten_m_(Water_Overlay)|Van Genuchten Soil parameter]]. | : <math>m</math> = [[Terrain_van_genuchten_m_(Water_Overlay)|Van Genuchten Soil parameter]]. | ||
Latest revision as of 14:06, 3 July 2026
| Icon | Attribute | Unit | Range | Description | Default value |
|---|---|---|---|---|---|
| SOIL_WATER_RETENTION_CURVE | 0 to 1 | Setting a Soil Water Retention Curve adjusts the vertical hydraulic conductivity in the Unsaturated Zone. | 0 |
When this attribute is set to 1, the vertical hydraulic conductivity is calculated using the Van Genuchten-Mualem formula:
Where:
- = The calculated vertical hydraulic conductivity for the given saturation
- = The saturated vertical hydraulic conductivity from Terrain ground infiltration md.
- = The effective saturation between 0-1 of the Unsaturated Zone. This is a fraction between Sr (assumed close to zero) and the Water storage percentage.
- =
- = Van Genuchten Soil parameter.
Notes
- This is still BETA functionality, disabled by default (
0).
How-to's
See also
- Group
- Model attributes
- Allowed water increase m • Avg shore width m • Avg terrain width m • Avg terrain storage m • Breach measurement distance m • Bridge elevation • Culvert dem threshold m • Design flood elevation m • Ground bottom distance m • Ground bottom pressure m • Ground water • Ground water depth m • Ground watertable with surface • Impact flood threshold m • Impact range m • Increased resolution • Infiltration factor s
- Limit area • Limit rain • Max infiltration m • Max water bottom m • Microrelief storage fraction • Min max elevation • Object entry correction • Prequel surface level relative • Rise rate distance m • Sewer overflow threshold • Shoreline • Duration min level m • Stabilizer angle • Start date ms • Surface water • Surface water evaporation factor • Timeframe times • Timeframes • Trim manning • Trim evapotranspiration • Trim root depth • Trim ground infiltration • Trim ground conductivity • Trim shoreline conductivity
- Related