Assessment and revision of flood hazard maps and flood risk maps from the sea side (including marine internal waters) located in the territorial jurisdiction of Maritime Office in Gdynia.
Voivodeship
Pomeranian Voivodeship, Warmian-Masurian Voivodeship
Usage of flood hazard and risk maps
Flood hazard maps and flood risk maps from the sea side are documents giving access to information on areas threatened with flood and the level of such a threat as well as indication which risk is related to occurrence of flood in a given area. The aim of creation of these documents is proper management of risk which flood may create for life and health of people, environment and economy. Such information will certainly contribute to making aware decisions in respect of location of investments by inhabitants and by local authorities. Each related party may check if the certain area is threatened by flood and if so to what extent it is threatened.
Information contained in the maps is also useful in responding and in managing crisis in the event of flood. The maps may represent an initial point for preparing further analyses necessary to complete actions of various administration authorities, including crisis management.
Scope of the flood hazard maps
Flood hazard maps will present areas with certain probability of flood occurrence from the sea side and water depth. Moreover flood hazard maps will present areas covering the land exposed to flooding in the event of destruction or damage of a counter storm embankment. The areas of flood hazard presented on the maps will be obtained as a result of a mathematical hydraulic modelling. Very accurate space data obtained with use of air laser scanning i.e. Digital Terrain Model and Digital Surface Model will be used in the process of modelling.
Scope of the flood risk maps
The flood risk maps will define values of potential flood losses and presenting locations exposed to flooding in the event of flood occurrence with a defined occurrence probability will be a supplement of the flood hazard maps. These are locations which will facilitate evaluation of flood risk for life and health of people, environment, cultural heritage and business activity so the groups for which negative effects of flood should be limited according to the objectives of the Flood Directive.
For this reason, for the areas presented on the flood hazard maps, elements such as the following will be marked:
- assessed population inhabiting a threatened area;
- houses and buildings of special social significance (hospitals, schools, nursery schools, hotels, commercial centres and others) – for which the water depth amounts to > 2 m and < 2 m (the limit value of water depth – 2m has been assumed in relation to assumed brackets of water depth and their influence on a degree of threat to people and building structures);
- historic areas and buildings and structures;
- protected areas i.e. water intakes, protective zones of water intakes, bathing zones, environment protection areas;
- potential sources of water pollution, in the event of flood occurrence i.e. industrial plants, wastewaters treatment plants, wastewaters pumping stations, landfills, cemeteries;
- values of potential losses for individual classes of land use i.e. areas of residential development, industrial areas, communication areas, forests, recreation areas, agricultural land, and waters.
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