Soil water retention curve (Water Overlay)

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:

$K(\theta )=K_s\cdot \sqrt{S_e}\cdot (1-(1-S_e^n{)}^m{)}^2$

Where:

$K(\theta )$ = The calculated vertical hydraulic conductivity for the given saturation

$K_s$ = The saturated vertical hydraulic conductivity from Terrain ground infiltration md.

$S_e$ = 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

• How to add and remove an Attribute

See also

• Ground infiltration formula (Water Overlay)

API Endpoints

• Api session event editor overlay set attribute

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