Groundwater Prequel (Water Overlay): Difference between revisions
No edit summary |
No edit summary |
||
| Line 7: | Line 7: | ||
* the water depth, as the initial distance between the surface and the [[Ground_watertable_result_type_(Water_Overlay)|watertable]]. A greater value in the GeoTIFF will result in a lower watertable. | * the water depth, as the initial distance between the surface and the [[Ground_watertable_result_type_(Water_Overlay)|watertable]]. A greater value in the GeoTIFF will result in a lower watertable. | ||
When a groundwater [[Prequel]] is not configured for the Water Overlay, the watertable is initialized using the [[water level (Water Overlay)|WATER_LEVEL]] attribute of the [[Water area (Water Overlay)|water area]] instead (or the [[ | When a groundwater [[Prequel]] is not configured for the Water Overlay, the watertable is initialized using the [[water level (Water Overlay)|WATER_LEVEL]] attribute of the [[Water area (Water Overlay)|water area]] instead (or the [[Surface level prequel (Water Overlay)]], if so configured). For locations without water areas, the water table is set to one meter below the [[elevation model (Water Overlay)|surface]]. | ||
The following [[Prequel]]s are possible: | The following [[Prequel]]s are possible: | ||
Revision as of 15:24, 23 February 2023
Groundwater levels in the Water model can be initialized using a Overlay Prequel.
Groundwater is only used when the GROUND WATER attribute of the Water Overlay is set to complete, meaning the underground model is vertically and horizontally fully active.
Values in the groundwater Prequel can represent either:
- the datum height of the ground water level.
- the water depth, as the initial distance between the surface and the watertable. A greater value in the GeoTIFF will result in a lower watertable.
When a groundwater Prequel is not configured for the Water Overlay, the watertable is initialized using the WATER_LEVEL attribute of the water area instead (or the Surface level prequel (Water Overlay), if so configured). For locations without water areas, the water table is set to one meter below the surface.
The following Prequels are possible:
| Name | Prequel | Underlying data | Unit | Range | No data | Description |
|---|---|---|---|---|---|---|
| Groundwater datum | GROUND_WATER_DATUM | Water Prequel | m datum | -10000 10000 | Clamped to range | Used for initializing the ground water level on this datum. |
| Groundwater depth | GROUND_WATER_DEPTH | Water Prequel | m | 0 10000 | Clamped to range | Used for initializing the ground water level to these depths. |
| Unsaturated fraction | UNSATURATED_FRACTION | Water Prequel | 0 to 1 | Clamped to range | Used for initializing the saturation of the unsaturated zone in the underground. |
Default data
For the Netherlands, a number of groundwater GeoTIFFs are provided by default, based on data provided by The Netherlands Hydrological Instrumentarium:
- NL_GHG_kk-nhi (Average highest waterdepth)
- NL_GLG_kk-nhi (Average lowest waterdepth)
- NL_GVG_kk-nhi (Average spring waterdepth)
It is important to emphasize that when using these GeoTIFFs, they should be configured as water depth (relative to terrain) rather than water height (relative to datum).
How-to's
- How to use a default groundwater GeoTIFF (Water Overlay)
- How to upload and use a groundwater GeoTIFF (Water Overlay)
See also
- Group
- Weather
- Bottom distance • Bottom pressure • Bottom resistance • Ground conductivity • Groundwater datum • Groundwater depth • Manning • Max infiltration • Microrelief • Surface level • Surface u • Surface v • Terrain elevation • Unsaturated fraction
- Elevation
- Elevation
- Related