The river Rhine runs through the Netherlands towards the North Sea. During very high discharges, which may occur more frequently in future owing to climate change, the floodwaters needs more space to spread out so as to prevent disastrous downstream flooding. There needs to be more Room for the River! This will be provided for the New Merwede branch of the Rhine by de-poldering the 4450 Ha Noordwaard polder*, which is situated in the South-western part of the Netherlands. De-poldering involves allowing water to stream through and over the Noordwaard polder when the river discharge is very high. By allowing flooding of the land that was previously protected by dikes, the predicted high water levels from river flooding will be reduced by 30 cm at the nearby town of Gorichem.

Nevertheless, within this de-poldered area, there are location(s) that still have to be protected from flooding. For instance, in the North East corner of the Noordwaard polder, a fortress called Fort Steurgat. This fortress has cultural and historical value. This corner is also home to eleven households.

In short, the primary problem owner or client is the Dutch Ministry of Infrastructure and Environment, who is tasked with ensuring that appropriate planning is undertaken to ensure the safety from flooding in the Netherlands. It is they who commission studies to determine the predicted flood levels, and they who then determine the desired reduction in flood level that must be achieved through actions like de-poldering.

* In the Netherlands, a polder is an area of low land that is protected from river or coastal floods by a ring of dikes.

Description of one Building with Nature Solution

The materials below provide you with a description of one Building with Nature solution to Case 1. This solution has already been implemented in the Netherlands.