Groundwater Prequel (Water Overlay): Difference between revisions

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Groundwater in the {{software}} is modeled in the form of a [[GeoTiff]].
Groundwater levels in the Water model can be initialized using a Overlay [[Prequel]].


Groundwater is only used when the [[ground water (Water Overlay)|GROUND WATER attribute]] of the [[Water Overlay]] is set to '''complete''', meaning the [[underground model (Water Overlay)|underground model]] is fully active.
Groundwater is only used when the [[ground water (Water Overlay)|GROUND WATER attribute]] of the [[Water Overlay]] is set to '''complete''', meaning the [[ground model (Water Overlay)|ground model]] is vertically and horizontally fully active.


Values in the groundwater GeoTIFF respersent the initial distance between the surface and the [[watertable]]. A greater value in the GeoTiff will result in a lower watertable. If there is no groundwater GeoTiff present, the water table is dictated by the [[water level (Water Overlay)|WATER_LEVEL]] attribute of the [[Water level area (Water Overlay)|water level area]] instead. If no water level area exists there either, the underground is assumed to be fully saturated, with the groundwater level equal to the surface height relative to {{datum}}.
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 [[Ground_watertable_result_type_(Water_Overlay)|watertable]]. A greater value in the GeoTIFF will result in a lower watertable.


For the Netherlands, a number of groundwater GeoTiffs are offered by default, based on data provided by The Netherlands Hydrological Instrument:
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]].
* NL_GHG_kk-nhi (Average highest watertable)
* NL_GLG_kk-nhi (Average lowest watertable)
* NL_GVG_kk-nhi (Average spring watertable)


{{GeoTiffSpec
The following [[Prequel]]s are possible:
|title=Groundwater
 
|description=The height of the ground water level across the project area.
{{Overlay prequels|suppresscategory=true|
|value=Groundwater level
{{:Groundwater datum prequel (Water Overlay)}}
|unit=m below terrain height
{{:Groundwater depth prequel (Water Overlay)}}
{{:Unsaturated fraction prequel (Water Overlay)}}
}}
}}


==How-to's==
==Default data==
* [[How to use a default groundwater GeoTiff (Water Overlay)|How to use a default groundwater GeoTiff]]
For the Netherlands, a number of groundwater GeoTIFFs are provided by default, based on data provided by The Netherlands Hydrological Instrumentarium:
* [[How to upload and use a groundwater GeoTiff (Water Overlay)|How to upload and use a groundwater GeoTiff]]
* NL_GHG_kk-nhi (Average highest waterdepth)
* NL_GLG_kk-nhi (Average lowest waterdepth)
* NL_GVG_kk-nhi (Average spring waterdepth)


==See also==
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).
* [[Water level area (Water Overlay)]]
 
* [[Underground model (Water Overlay)]]
{{article end
* [[Ground watertable result type (Water Overlay)| Ground watertable]]
|howtos=
* [[How to use a default groundwater GeoTIFF (Water Overlay)]]
* [[How to upload and use a groundwater GeoTIFF (Water Overlay)]]
|seealso=
* [[Water area (Water Overlay)]]
* [[Ground model (Water Overlay)]]
* [[Ground watertable result type (Water Overlay)]]
}}


{{WaterOverlay simulation data nav}}
{{WaterOverlay simulation data nav}}
{{Water Module buttons}}

Latest revision as of 15:53, 26 January 2024

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 ground 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

See also

Water Module
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Prequels
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
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Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Model attributes • Results
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