Flood hazard map

Dataset

Definition: Flood hazard maps show areas that are prone to flooding at various flood levels ( return periods). Flood hazard maps are prepared for floods with 20-, 200- and 1000-year return period. In areas where climate change is expected to increase water discharge with more than 20%, flood hazard maps are being prepared for a 200-year flood in the year 2100.

Updated: 21.06.2025
Submitter: Norwegian Mapping Authority
Owner: Norwegian Water Resources and Energy Directorate

Usage

 Flood hazard maps should be used in land use planning to identify areas prone to flooding( should not be developed), and in order to assess relevant risk-reducing measures if it is impossible to avoid development. \\nGuidelines 2-2011 Flaum- og skredfare i arealplanar (Flood and avalanche risk in land use planning) describe how safety requirements for structures specified in the Regulations on technical requirements for building works (TEK 17), section 7-2 can be fulfilled in spatial planning. \\nWhen dealing with detailed zoning plans, division proceedings and processing building applications, it is necessary to take the limited accuracy of the flood hazard maps into account. In-situ measurements of elevation should be checked and compared to the calculated water levels.\\n If development is planned in areas prone to flooding, it is recommended to add a safety margin to the calculated water levels to take uncertainty in the data into account.

Inspire tema: Natural risk zones

Areal

Areal: 0

Relevant areal: 0

Inspire status
ASSESSMENT POINT
STATUS VALUE
COMMENT
Metadata:
good
Metadata service status
good
Sharing of data
good
WMS:
useable
Download service WFS
useable
Download service Atom feed
good
Download service WFS or Atom-feed
good
Harmoniserte data
deficient
Spatial data service
deficient
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