Unsaturated fraction (Water Overlay): Difference between revisions
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* This value is automatically adjusted for the [[Min unsaturated fraction (Terrain Attribute)|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 [[Terrain water storage percentage (Water Overlay)|Water storage percentage]] attribute. | * The maximum storage capacity of underground terrains can be configured with the [[Terrain water storage percentage (Water Overlay)|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: <br>Amount of water in the unsaturated zone = relative ground water depth * [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] * [[Unsaturated fraction (Water Overlay)|UNSATURATED_FRACTION]]. | * 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: <br>Amount of water in the unsaturated zone = relative ground water depth * [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] * [[Unsaturated fraction (Water Overlay)|UNSATURATED_FRACTION]]. | ||
Revision as of 13:06, 2 December 2025
| 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 |
Notes
- This value is automatically adjusted for the 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
See also
- 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