Groundwater Prequel (Water Overlay)

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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 Water Level Prequel, 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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Water Module
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Tutorials
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Overview
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Theory
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Benchmarks
Group
Weather
Rain m • Evaporation m
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
Elevation
Elevation
Related
Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Model attributes • Results
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