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The first version of the product specification was published in 2018 and was linked to the guidelines «Havnivåstigning og stormflo – samfunnssikkerhet i kommunal planlegging» from DSB (2016). The data was from the report Sea Level Change in Norway (2015) based in IPCC AR5. In 2024, the data model has been updated in accordance with the new guidelines for use in municipal planning that DSB published in June, based on a new knowledge base from the report Sea-Level Rise and Extremes in Norway from April 2024. This includes new time horizons and an estimate for high-end water levels. The data set now includes the numbers for the municipalities former given in the guidelines.
Oseanografiske geografiske forhold Menneskers helse og sikkerhet Områder med naturbetingede farer NSDI data Geodata Act Norway Digital Modellbaserte vegprosjekter Felles datakatalog Samfunnssikkerhet Plan Vær og klima Norskekysten Storm surge Sea-level changes Flooding Sea level High water levels Sea-level rise Extreme still water levels Dekningsområde Stormflo200År_KlimaÅrNå Middelhøyvann_KlimaÅr2100 StormfloØvreEstimat_KlimaÅr2150 Stormflo1000År_KlimaÅrNå StormfloØvreEstimat_KlimaÅr2100 Stormflo20År_KlimaÅrNå Stormflo1000År_KlimaÅr2100 GenerelleEgenskaperStormfloHavnivå Stormflo200År_KlimaÅr2100 Middelhøyvann_KlimaÅr2150 StormfloØvreEstimat_KlimaÅrNå Middelhøyvann_KlimaÅrNå dekningStatus sikkerhetsklasseFlom vannstandOverNN2000 klimaÅr National oceans
Please note that the dataset has just been updated according to new guidelines from The Norwegian Directorate for Civil Protection (DSB) valid from 1st of July. The dataset will be gradually improved for a while, for instance will isolated flooded areas on land be removed, as they will not experience flooding from the sea.

The sea level (havnivå) is rising as a result climate change due to human activities. The report Sea-Level Rise and Extremes in Norway (2024) shows that also Norway will experience the increasing rise. In their guidelines for local planning The Norwegian Directorate for Civil Protection (DSB) gives advice to the municipals on how to adapt to the rising sea level in their planning, both in the short and the longer time span, and for both new and existing buildings. The aim is to lower the risk of loss of life, damage to health, important infrastructure and material values etc. due to flooding. In addition to sea level rise, the guidelines include high water levels (stormflo) because the high water level events will reach higher, and come more often, than today.

Information about the high water levels at the current or a future sea level, as the guidelines recommend the municipalities should use, are contained in this dataset. The Norwegian Mapping Authority has furthermore modelled which areas are likely to be exposed to high water level events, today and in the future.

The high water levels corresponds to the safety classes for flooding used in TEK17, which are the extreme still water levels with 20-, 200- and 1000-years return periods. In addition there is a high-end water level (øvre estimat vannstand) which is recommended for buildings within TEK17 § 7-2, first paragraph.

Some of these high water levels also come with allowances for sea level rise up until year 2100 or 2150. Following to the new precautionary principle for climate adaption in Norway, the allowance is based on the emission scenario SSP3-7.0 using the 83% of the likely range.

This dataset and the guidelines from DSB are mainly for the municipalities and other experts investigating and assessing the consequences of sea level rise and high water levels in connection with the planning and building act, and when preparing risk and vulnerability analysis according to the civil protection act.

More information in the product spesification (Norwegian only).
Storm surge and sea-level rise