Climate Atlas — Theme Flood — Vulnerability buildings after dike breakthrough

This map shows the vulnerability of buildings to the most conceivable flood due to breakthroughs by both the primary and regional water systems. The maximum water depth from the maps ‘flood image primary’ and ‘flood image regional’ is compared to the floor level per building. This floor level is derived from the AHN2 and AHN3 (height around the building). If the maximum water depth is higher than the floor level, there is a risk of influx of water, and thus damage into the building. The following class layout is based on the height of the water against the facade in the event of a flood: » Between 0 and 0.2 metres of water depth against facade (Before water flows in, it must cross the threshold); » Between 0.2 and 0.5 metres of water depth against facade (plugs are often 30 centimeters above the threshold); » Between 0.5 and 2.0 metres of water depth against facade; » More than 2.0 meters of water depth against facade. This class classification is based on the Delta Program Spatial Adaptation. For each class, a different type of measure is appropriate to limit damage and victims, ranging from (temporary) thresholds to evacuating in shelters. The centimetres are intended as an indication, to indicate which buildings can be considered relatively more with regard to flooding.