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Floods; determination of floodplains
The Bavarian Water Management Administration determines floodplains for a 100-year flood event, which are established by the district administrative authorities by statutory order.
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UmweltAtlas Bayern - Überschwemmungsgefahren im Themenbereich NaturgefahrenThe Natural Hazards section of the UmweltAtlas Bayern publishes information on flood hazards as well as provisionally secured and officially designated floodplains.
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Landratsamt Weißenburg-Gunzenhausen - SG 45 - Wasserrecht
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Bahnhofstr. 2
91781 Weißenburg i.Bay.
Postal address
91780 Weißenburg i.Bay.
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Description
The most effective way to avoid flood damage is to prevent potential damage in areas at risk of flooding from occurring in the first place. The Water Resources Act obliges the federal states to designate at least those areas within risk areas or assigned areas where a flood event is statistically to be expected once every 100 years and the areas required for flood relief and retention as floodplains.
In Bavaria, there is a need to identify floodplains along all major watercourses, the first and second order watercourses with a total length of 9,000 km, and above all in settlement areas along the smaller watercourses, the third order watercourses. These areas are defined by legal ordinance of the district administrative authority.
A digital terrain model, survey data and the evaluation of land use data and aerial photographs form the technical basis. This allows a flood event to be simulated, which statistically occurs once every 100 years, and the corresponding floodplain to be determined.
The water management authorities pass these results on to the district authorities for approval in the form of site plans.
Various prohibitions apply in designated floodplains. For example, no new building areas may be designated in urban land-use plans or other statutes in accordance with the German Building Code in designated floodplains. Exceptions are only possible under strict legal conditions.
Legal bases
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Art. 46 Bayerisches Wassergesetz (BayWG)Überschwemmungsgebiete an oberirdischen Gewässern
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§ 76 Gesetz zur Ordnung des Wasserhaushalts (Wasserhaushaltsgesetz - WHG)Überschwemmungsgebiete an oberirdischen Gewässern
Related issues
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Waters of the third order; information on flood protectionThe state and local authorities take protective measures and make preparations to limit the effects of flooding.
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First and second order watercourses; information on flood protectionThe state and local authorities take protective measures and make preparations to limit the effects of flooding. In addition, each individual is required to make their own preparations in order to avoid or prevent damage.
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Floods; information from district administrative authoritiesIf the specified water levels are exceeded, the water management authorities inform the district administrative authorities, which in turn pass on the flood warnings to the municipalities.
Status: 02.05.2025
Editorially responsible for prodecure description: Bayerisches Staatsministerium für Umwelt und Verbraucherschutz
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