Water management measures in two lowland basins to reduce flooding

TL;DRAbstract

In the northern part of the Netherlands some years ago flooding took place and there were very serious threats of flooding densely populated areas. Therefore a project has been carried out in an area of 1200 km 2 with a number of brooks to assess the possible retention of water in the upper parts of the river basins in order to reduce the threat of flooding more downstream. The physically-based groundwater and surface water model SIMGRO was used to gain insight in the hydrology of the basins. The model was calibrated using discharges and groundwater levels. Scenarios were defined to represent measures to assess the possible retention of water in the upper parts. One measure is the retention of higher discharges using culverts or gates, the other is to make the brooks shallower, which means reduce the stream flow and the adjacent banks of the river will be flooded. Holding water in the upstream parts of the basins proved to be feasible. The reduction of the peak flow is significant.

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