Soil water retention curve (Water Overlay): Difference between revisions

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{{Overlay attributes|type=row|overlay=Water  
{{Overlay attributes|type=row|overlay=Water  
|attribute=SOIL_WATER_RETENTION_CURVE
|attribute=SOIL_WATER_RETENTION_CURVE
|unit=m
|unit=
|description=Setting a Soil Water Retention Curve retains a fraction of the water in the Unsaturated Zone.
|range=0 to 1
|description=Setting a Soil Water Retention Curve adjusts the vertical hydraulic conductivity in the Unsaturated Zone.
|defaultvalue=0
|defaultvalue=0
|icon=
|icon=
}}</onlyinclude>}}
}}</onlyinclude>}}


This can be done via the Van Genuchten-Mualem formula:
When this attribute is set to <code>1</code>, the vertical hydraulic conductivity is calculated using the Van Genuchten-Mualem formula:
: <math>K(t) = Ks * sqrt(Se) * {1 - (1 - Se^(1/m)}^m</math>
: <math>K(\theta) = K_s \cdot \sqrt{S_e} \cdot (1 - ( 1 - S_e^n )^m )^2</math>
 
Where:
: <math>K(\theta)</math> = The calculated vertical hydraulic conductivity for the given saturation
: <math>K_s</math> = The saturated vertical hydraulic conductivity from [[Terrain ground infiltration md (Water Overlay)|Terrain ground infiltration md]].
: <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>m</math> = [[Terrain_van_genuchten_m_(Water_Overlay)|Van Genuchten Soil parameter]].


{{article end
{{article end
|notes=* This is still BETA functionality, disabled by default (value=0).
|notes=* This is still BETA functionality, disabled by default (<code>0</code>).  
* For Van Genuchten-Mualem select 1.
|seealso=
|seealso=
* [[Ground infiltration formula (Water Overlay)]]
* [[Ground infiltration formula (Water Overlay)]]
|howtos=
|howtos=
* [[How to add and remove an Attribute]]
* [[How to add and remove an Attribute]]
|api=
* [[Api session event editor overlay set attribute]]
}}
}}


{{WaterOverlay model attribute nav}}
{{WaterOverlay model attribute nav}}

Latest revision as of 13:47, 10 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:

K(θ)=Ks⋅Se⋅(1−(1−Sen)m)2

Where:

K(θ) = The calculated vertical hydraulic conductivity for the given saturation
Ks = The saturated vertical hydraulic conductivity from Terrain ground infiltration md.
Se = 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.
n = 1/m
m = Van Genuchten Soil parameter.

Notes

  • This is still BETA functionality, disabled by default (0).

How-to's

See also

API Endpoints

Water Module
Water Module
Tutorials
Overview
Theory
Benchmarks
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
Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Prequels • Results • Simulation data
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