Climate atlas — Theme Water nuisance — Water depth in extreme rainfall nationwide

This map shows the result of a stress test for the rural area of South Holland. The map shows where water pollution is likely to occur after an extreme shower of 100 millimetres in 2 hours. The stress test of the rural area was carried out with 2D terrain models (3Di) built from the filtered and interpolated General Height Map Netherlands (AHN2 and AHN3), information on land use (for friction) and on the soil (for infiltration). The resolution of the results is 0.25 m². For the urban area, integrated models have been used for various municipalities in which the sewerage is also included (for this, set the layer of model information and click on the map for additional information). In the 2D terrain models, the current over the ground and the water distribution via the waterways at a high level of detail are included. The precise operation of sewage and works of art in the water system (divers, stows and ground) is not included or simplified in the model (Stress Test Spatial Adaptation). It is therefore possible that the water pollution presented is not always recognised in practice (to that extent). Therefore, no rights can be derived from absolute values. However, the results give a first indication of the foreseeable inconvenience locations in case of heavy rainfall. Based on model checks carried out, it is also indicated where there is a possible overestimation or underestimation of the flood (deploy the low model check for this). For buildings (source: Bag) has been adopted in the terrain model a floor level of 15 cm above ground level. The flooding of buildings via thresholds is not taken into account, as detailed information of threshold height is still missing.