Supporting data with depth values for potential hazard areas

The dataset provides supporting groundwater depth values as a supplement to the mapping of potential groundwater flooding hazard areas in Denmark. The dataset shows the depth to the projected typical winter groundwater table in metres below terrain for the period 2071-2100 under the RCP8.5 emissions scenario. The depth values can be used to interpret and add detail to the potential hazard areas, including how close the groundwater table is expected to be to the terrain surface. The dataset is provided as raster data with a spatial resolution of 10 × 10 m.

Simple

Date ( Publication )
2022-01-01
Identifier
dk.geus / dk_stoettedata_dybdevaerdier_potentielle_fareomraader
Presentation form
Digital map
Purpose

The purpose of the dataset is to provide users with a supplementary data basis for understanding and interpreting the potential hazard areas for groundwater flooding. The dataset shows groundwater depth values in metres below terrain and can be used together with the hazard area dataset for screening, planning and general assessment of shallow groundwater conditions. The dataset should not be used as a local detailed assessment of groundwater conditions.

The dataset shows groundwater depth values in metres below terrain as a supplement to the mapping of potential hazard areas for groundwater flooding. The depth values cover the interval from 0 m to 3 m and above. The interval from 0 m to 1 m is covered by the rules set out in the draft Executive Order, where 1 m below terrain is used as the threshold value for identifying potential hazard areas for groundwater flooding. The dataset does not in itself represent a legal designation, but supports the interpretation of the hazard area dataset and should be used with attention to uncertainties in the data basis, model calculations, climate projections and spatial resolution. The interval from 1 m to 3 m is also considered relevant due to the uncertainty in the dataset, which is estimated at approximately 1 m, expressed as the mean absolute error in Troldborg et al. (2026). Although the threshold value for identifying potential hazard areas for groundwater flooding is set at 1 m, it may therefore be beneficial for the mapping of potential hazard areas to also take this uncertainty into account.

The thematic time period of the dataset is the projection period 2071–2100. The historical input dataset for median winter groundwater table represents the period 1991–2025.

The dataset is supporting data for the dataset "Potential hazard areas for groundwater flooding" (https://metadata.geus.dk/geonetwork/srv/dan/catalog.search#/metadata/52e56e3b-ea89-4c67-a28e-f6885494b0b1).
Status
Completed
Point of contact
  Danish Planning and Rural Development Agency - PLST Hearing ( )
Maintenance and update frequency
As needed
Point of contact
  Geological Survey of Denmark and Greenland (GEUS) - GIS-support
Keywords ( Theme )
  • Dataset
  • Groundwater
  • Depth values
  • Supporting data
  • Climate adaptation
Forskningsemner Forskningsemner ( Theme )
Geografisk Geografisk ( Place )
Access constraints
Other restrictions
Use constraints
Other restrictions
Other constraints
CC BY 4.0
Other constraints
Creative Commons Attribution 4.0 International (CC BY 4.0). The dataset may be used freely with attribution.
Spatial representation type
Grid
Denominator
10000
Metadata language
Da
Character set
UTF8
Topic category
  • Geoscientific information
Begin date
2071-01-01
End date
2100-12-31
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Supplemental Information
Non specified
Reference system identifier
ETRS 89 / UTM 32N (EPSG:25832)
Distribution format
  • GeoTIFF ( )

Distributor
  Geological Survey of Denmark and Greenland (GEUS) - GIS-support
OnLine resource
Interactive webmap ( WWW:LINK-1.0-http--link )

Interactive map displaying the dataset.

OnLine resource
Scientific article on high-resolution modelling of shallow groundwater using a knowledge-guided gradient boosting decision tree model. ( DOI )

Koch, J., Gotfredsen, J., Schneider, R., Troldborg, L., Stisen, S., & Henriksen, H. J. (2021). High resolution water table modeling of the shallow groundwater using a knowledge-guided gradient boosting decision tree model. Frontiers in Water, 3, 701726.

OnLine resource
Scientific article on machine-learning-based downscaling of modelled climate change impacts on groundwater table depth. ( DOI )

Schneider, R., Koch, J., Troldborg, L., Henriksen, H. J., & Stisen, S. (2022). Machine-learning-based downscaling of modelled climate change impacts on groundwater table depth. Hydrology and Earth System Sciences, 26(22), 5859-5877.

OnLine resource
Documentation report for model deliveries to the Hydrological Information and Forecasting System, version 2. ( DOI )

Troldborg, L., Ondracek, M., Koch, J., Schneider, R. J. M., Henriksen, H. J., Kragh, S. J., Gotfredsen, J., van Til, M., Jakobsen, A., Rasmussen, P., Pasten-Zapata, E., & Stisen, S. (2026). Dokumentationsrapport vedr. modelleverancer til Hydrologisk Informations- og Prognosesystem - Version 2. De Nationale Geologiske Undersøgelser for Danmark og Grønland. Danmarks og Grønlands Geologiske Undersøgelse Rapport Vol. 2026 No. 9.

OnLine resource
Report from the working group on tightening the Planning Act's rules on climate adaptation, etc. ( WWW:LINK-1.0-http--link )

Report with proposals for amendments to the Planning Act to strengthen climate adaptation and prevent damage from flooding and erosion through more robust planning requirements

OnLine resource
The consultation portal ( WWW:LINK-1.0-http--link )

Consultation on a proposal for a law amending the Planning Act, the Nature Conservation Act and the Building Act (Better development opportunities for rural areas and stricter requirements for climate adaptation on the coasts)

OnLine resource
Annex 1 to the Climate Adaptation Executive Order ( WWW:DOWNLOAD-1.0-http--download )

Method description for maps of potential danger areas, cf. section 1 of the executive order

OnLine resource
The consultation portal ( WWW:LINK-1.0-http--link )

Consultation on draft executive order on climate adaptation in municipal plans

OnLine resource
Climate adaptation in municipal plans ( WWW:LINK-1.0-http--link )

How to find draft state maps of potential hazard areas.

Hierarchy level
Dataset
Statement
The dataset was established as supporting data for the mapping of potential hazard areas for groundwater flooding. The depth values are calculated from data from the Hydrological Information and Forecasting System (HIP). Two HIP data layers were used: the historical median winter groundwater table at 10 × 10 m resolution, representing the period 1991-2025, and a projected change in mean winter groundwater table at 100 × 100 m resolution for the RCP8.5 emissions scenario for the period 2071-2100. The projected change represents the median across 17 climate models. The historical winter groundwater table was calculated using a machine learning model, while the climate-related change was simulated using the National Hydrological Model for Denmark, also known as the DK model. The two data layers were combined to calculate a projected typical winter groundwater table. The result provides the depth to the groundwater table in metres below terrain and serves as a supplement to the dataset showing potential hazard areas for groundwater flooding.
File identifier
59b44227-2994-4de5-8e6e-aa74e9e3ac26 XML
Metadata language
Danskda
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2026-08-28T09:53:37.882663Z
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
  The Geological Survey of Denmark and Greenland (GEUS) - GIS-support ( )
 
 

Overviews

overview

Spatial extent

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Keywords

Climate adaptation Dataset Depth values Groundwater Supporting data
Forskningsemner
Hydrology

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