Water area (Subsidence Overlay): Difference between revisions
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[[Water level area (Subsidence Overlay)|Water level areas]] are areas of which the water level is managed by a water authority. Water levels have to be kept high enough such that subsidence is minimized but low enough such that agriculture can flourish. When subsidence occurs, the subsidence model supports the mechanism of [[Indexation formula (Subsidence Overlay)|indexation]] in which water levels are automatically lowered to keep the ground water levels at a similar level | [[Water level area (Subsidence Overlay)|Water level areas]] are areas of which the water level is managed by a water authority. Water levels have to be kept high enough such that subsidence is minimized but low enough such that agriculture can flourish. When subsidence occurs, the subsidence model supports the mechanism of [[Indexation formula (Subsidence Overlay)|indexation]] in which water levels are automatically lowered to keep the ground water levels at a similar level. | ||
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* In the subsidence models, water levels of water areas only influence the ground water level indirectly. Automatic adjustments of water levels, by indexation, do not always lower the ground water level in the same amount. | * In the subsidence models, water levels of water areas only influence the ground water level indirectly. Automatic adjustments of water levels, by indexation, do not always lower the ground water level in the same amount. | ||
* The [[Terrain (Subsidence Overlay)|subsidence terrain keys]] can be overridden by overlapping [[Subsidence area (Subsidence Overlay)|Subsidence areas]]. Water level areas can also be Subsidence areas at the same time. | |||
|seealso= | |seealso= | ||
* [[Indexation formula (Subsidence Overlay)|Indexation formula]] | * [[Indexation formula (Subsidence Overlay)|Indexation formula]] | ||
}} | }} | ||
{{SubsidenceOverlay feature attribute nav}} | {{SubsidenceOverlay feature attribute nav}} | ||
Revision as of 09:44, 16 February 2021
Water level areas are areas of which the water level is managed by a water authority. Water levels have to be kept high enough such that subsidence is minimized but low enough such that agriculture can flourish. When subsidence occurs, the subsidence model supports the mechanism of indexation in which water levels are automatically lowered to keep the ground water levels at a similar level.
| Icon | Key | Unit | Range | Description | Default value |
|---|---|---|---|---|---|
 |
WATER_LEVEL | m + datum | The datum height of the water level in the Water Area. | n/a | |
 |
INDEXATION | m | When Indexation is non zero, the water level is automatically adjusted each simulation year, depending on the calculated subsidence. Indexation may range from 0 (0%) to 1 (100%). | 10.7 | |
| |
WATER_LEVEL_OUTPUT | m + datum | The new datum height of the water level in the Water Area as a result of indexation in response to subsidence. | n/a |
Notes
- In the subsidence models, water levels of water areas only influence the ground water level indirectly. Automatic adjustments of water levels, by indexation, do not always lower the ground water level in the same amount.
- The subsidence terrain keys can be overridden by overlapping Subsidence areas. Water level areas can also be Subsidence areas at the same time.
See also
- Group
- Model
- Drainage
- Related