Min unsaturated fraction (Terrain Attribute)

Icon	Attribute	Unit	Layer	Range	Description
	MIN_UNSATURATED_FRACTION	m	Underground	0 - 1	This values defines the minimal water fraction stored in the unsaturated zone.

Used for

• Water Overlay

Model-specific articles

• Terrain min unsaturated fraction (Water Overlay)

Notes

• This minimal fraction prevents the unsaturated zone from running dry. Default value is around the 10%-15%.
• Water either comes from above (surface) or uptake from below (saturated zone) to reach this value.
• When the ground water (saturated zone) drops below the GROUND_WATER_MAX_UPTAKE_DEPTH_M this uptake is stopped.
• Can also be adjusted via a Min unsaturated fraction prequel (Water Overlay).

See also

• Terrain Attributes
• Ground infiltration formula (Water Overlay)
• Unsaturated fraction (Water Overlay)
• Ground water max uptake depth m (Water Overlay)