Unsaturated fraction (Water Overlay)

Icon	Attribute	Unit	Range	Description	Default value
	UNSATURATED_FRACTION	fraction		The initial fraction of the maximum storage capacity of the unsaturated zone which is filled with water.	0.0

Notes

• This value is automatically adjusted for the terrain's MIN_UNSATURATED_FRACTION value. Thus initial fraction = max(UNSATURATED_FRACTION, MIN_UNSATURATED_FRACTION).
• The maximum storage capacity of underground terrains can be configured with the Water storage percentage attribute.
• Note that this fraction is relative to the maximum water storage capacity of the terrain and not relative to the underground terrain volume. This amounts to the following formula:
  Amount of water in the unsaturated zone = relative ground water depth * WATER_STORAGE_PERCENTAGE * UNSATURATED_FRACTION.
• For example, an underground terrain with a water storage of 25% and a ground water depth of 1 m and a configured unsaturated fraction of 0.25 will result in 0.0625 meter water in the unsaturated zone. (25% of 25% of the total volume of 1 m3)

How-to's

• How to add and remove an Attribute

See also

• Unsaturated fraction prequel (Water Overlay)
• Terrain min unsaturated fraction (Water Overlay)
• Ground infiltration formula (Water Overlay)

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