Blokhoven inundation area

The Blokhoven polder flood plain is situated behind the Achterdijk in Schalkwijk. During heavy rainfall, it can collect up to 23,000 m3 of water to prevent Schalkwijk from being flooded. This volume is equivalent to around 10 Olympic swimming pools. The area is at the heart of the New Dutch Waterline. In the summer, the plain is flooded twice a month to illustrate the inundation principle for visitors. If heavy or prolonged rainfall is forecast, the water board may decide to forego the inundation, as the plain will be needed to collect excess water.