Soil water retention curve (Water Overlay)

Icon	Attribute	Unit	Range	Description	Default value
	SOIL_WATER_RETENTION_CURVE	m		Setting a Soil Water Retention Curve retains a fraction of the water in the Unsaturated Zone.	0

This can be done via the Van Genuchten-Mualem formula:

$K(t)=Ks\cdot \sqrt{Se}\cdot (1-(1-S{e}^n{)}^m{)}^2$

Where:

$K(t)$ = Is the calculated vertical hydraulic conductivity for the given saturation t (greek: θ)

$Ks$ = Is the saturated vertical hydraulic conductivity from Terrain ground infiltration md.

$Se$ = Is 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 (value=0).
• For Van Genuchten-Mualem select 1.

How-to's

• How to add and remove an Attribute

See also

• Ground infiltration formula (Water Overlay)

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