Integrated map of flood hazard classes (IKRPN)

Flood hazard zones shall be classified into flood hazard classes on the basis of criteria classifying the power of the flood flow at the same probability of occurrence, the criterion demonstrating the highest hazard class being decisive. Plot spatial objects represent the ranges of areas of the class: - small flood hazards (Pm) where, at flow rate Q100 or G100 level, the water depth is less than 0,5 m or the product of water depth and water velocity is less than 0,5m2/s. - medium flood hazards (Ps) where, for flow Q100 or G100 level, the water depth is equal to or greater than 0,5 m and less than 1,5 m, or the product of water depth and velocity is equal to or greater than 0,5 m2/s and less than 1,5 m2/s, or where, for flow Q10 or G10 level, the water depth is greater than 0,0 m. - major flood hazards (Pv), where at flow rate Q100 or G100 level the water depth is equal to or greater than 1,5 m or the product of water depth and velocity is equal to or greater than 1,5 m2/s. - residual flood hazards (Pp), where the flood occurs due to extraordinary natural or man-made events (e.g. extraordinary meteorological events or damage or collapse of flood protection facilities or other water facilities). In practice, these areas include flood risk areas between Q100 and Q500. - and the area of validity of the results (OVR) - this is the area where the flood hazard classes shown are valid. The basic purpose of the data layer is to define the conditions and restrictions for the implementation of interventions in space and activities in areas at risk from floods. The data are also intended for the planning of flood risk reduction measures, spatial planning and interventions and information on flood conditions.