Flooding - rough susceptiblitity zones

The Norwegian Water Resources and Energy Directorate's susceptibility map for flooding is a national map at a general level which shows which areas may be vulnerable to flooding. It will never be possible to make the map entirely accurate, but it is good enough to provide an indication of where the risk of flooding should be assessed in greater detail if new development is in the offing. The information on the map can be used as an initial assessment base in impact assessment and/or risk and vulnerability analyses linked with the municipal plan, and in order to identify potential flood hazard areas. The potential hazard areas can be used as a basis when establishing flood zones requiring special consideration and planning provisions.

Date (Creation): 2016-01-14

Date (Publication): 2016-01-14

Date (Revision): 2025-04-21

Code: flom_aktsomhetsomrader

Purpose: The level of the susceptibility map is adapted to the municipality's general planning (municipal planning level). The maps indicate nothing about likelihood, and they cannot be used alone in zoning plan work or to assess development pursuant to the safety requirements in the technical building regulations.

The Norwegian Water Resources and Energy Directorate guidelines "Flaum- og skredfare i arealplanar" recommend a general procedure for assessing the risk of flooding in connection with spatial planning and development in areas where the risk of flooding is not mapped in greater detail.

If you use the susceptibility map as a basis for assessment when working on the municipal plan, you will have every chance of ending up with a plan for a changed climate in 2100 as regards the risk of flooding.

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Norwegian Water Resources and Energy Directorate		gisstotte@nve.no	Publisher
Norwegian Water Resources and Energy Directorate		gisstotte@nve.no	Owner

Maintenance and update frequency: As needed

GEMET - INSPIRE themes, version 1.0

Områder med naturbetingede farer

Nasjonal inndeling i geografiske initiativ og SDI-er

Geodata Act
NSDI data
Norway Digital
Inspire
Modellbaserte vegprosjekter
Felles datakatalog

Nasjonal tematisk inndeling (DOK-kategori)

Samfunnssikkerhet

Place

Nationwide

Theme

flom
aktsomhetskart
aktsomhetsområde

Spatial scope

National

Specific usage: The Norwegian Water Resources and Energy Directorate accepts no liability for damage or injuries due to errors in data and incorrect use of data.

User contact info

Organisation name	Individual name	Electronic mail address	Role
			Owner

Use limitation: No conditions apply

Access constraints: Other restrictions

Other constraints: Åpne data

Use constraints: Other restrictions

Other constraints: Norsk lisens for offentlige data (NLOD)

Classification: Unclassified

Spatial representation type: Vector

Denominator: 50000

Language: Norwegian

Topic category

Environment

Supplemental Information: The susceptibility map for flooding is produced on the basis of hydrological models based on experience from Norwegian watercourses and a digital terrain model. The susceptibility map shows which areas may potentially be susceptible to flooding.

The method used to produce the susceptibility map is discussed in Norwegian Water Resources and Energy Directorate Report no. 07/2011 "Preliminary flood risk assessment in Norway: an example of a methodology based on a GIS-approach" (chapter 6). The increase in the water level will usually be significantly overestimated when this method is used. Therefore, more detailed mapping will generally reduce the extent of the susceptibility area.

A correct level of detail is shown when the map is viewed on a scale of approx. 1:50,000.

Unique resource identifier: EPSG:25832

Unique resource identifier: EPSG:25833

Unique resource identifier: EPSG:25835

Unique resource identifier: EPSG:3035

Unique resource identifier: EPSG:4258

Distribution format

Name	Version
FGDB
FGDB	10.0
GML
GML	3.2.1
PostGIS
PostGIS	12
SOSI
SOSI	4.5
FGDB
GML
PostGIS
SOSI

Units of distribution: fylkesvis, kommunevis, landsfiler

OnLine resource

Protocol	Linkage	Name
GEONORGE:DOWNLOAD	https://nedlasting.test.geonorge.no/api/capabilities/

Hierarchy level: Dataset

Domain consistency

Conformance result

Title: COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

Date (Publication): 2010-12-08

Title: inspire

Date

Explanation: The data is not evaluated according to the product specification

Conformance result

Title: SOSI produktspesifikasjon: Flom aktsomhetsområder

Date (Publication): 2020-09-08

Title: sosi

Date

Explanation: The data is according to the product specification

Pass: Yes

Domain consistency

Conformance result

Title: Sosi applikasjonsskjema

Date (Publication): 2020-09-08

Title: uml-sosi

Date

Explanation: SOSI files are according to application form

Pass: Yes

Conformance result

Title: Sosi applikasjonsskjema

Date (Publication): 2020-09-08

Title: uml-gml

Date

Explanation: GML files are according to application form

Pass: Yes

Completeness omission

Name of measure: Prosentvis dekning i forhold til datasettets utstrekning

Measure description: Datasettets faktiske kartlagte areal i forhold til datasettets spesifiserte utstrekning

Quantitative result

Value: 100

Completeness omission

Name of measure: Prosentvis oppfyllelse av FAIR-prinsipper

Measure description: Angir fullstendighet i forhold til krav fra FAIR-prinsippene (The FAIR Guiding Principles for scientific data management and stewardship)

Quantitative result

Value: 100

Statement: Aktsomhetsområdene er analysert basert på landsdekkende høydemodell med 10 x10 m oppløsning, landsdekkende datasett FKB-Vann og en estimert vannstandstigning i norske elver. Uavhengig av vannstandsstigningen er det langs alle elver og innsjøer i aktsomhetskartet inkludert et område på minimum 20 m fra kant av elv, bekker og innsjøer.

Konstruksjoner som f.eks. bru og kulvert, kan medføre at vannstanden heves, og oppstuvingen oppstrøms kan bli stor. Slike hydrauliske forhold er ikke tatt hensyn til, og aktsomhetskartet kan derfor vise for liten oversvømmelse i slike tilfeller.

I elvas utløpsområde til sjø vil stormflo også medføre fare for oversvømmelser. Stormflo er ikke tatt hensyn til i aktsomhetskartet. Faresoner for stormflo ved 20-, 200- og 1000-års gjentaksintervall, finnes i karttjenesten Se havnivå i kart https://www.kartverket.no/sehavniva/se-havniva-i-kart/.

Dette notatet beskriver detaljert metoden som er brukt i utarbeidelsen av aktsomhetskartet:

https://webfileservice.nve.no/API/PublishedFiles/Download/202010351/3271085