In the coming years we will study four flood plains along the Waal that flood in a controlled manner every year: Buitenooy and Staartjeswaard (both near Nijmegen), Nieuw Munnikenland (near Loevestein Castle) and the Eijerwaard polder (part of the Noordwaard – Biesbosch). At these locations, water will be retained in various ways, with locks, weirs, valve culverts, etc. This happens after the high water peak in the spring, when the snow from the Alps melts.
We will then monitor whether the water actually remains longer and whether it indeed leads to increased ecological value, including the growth of algae, macrofauna, zooplankton and fish. We look at how much development occurs, which species these are and how the food web is structured. Birds are also included in this study to complete the food web. To determine the control factors, we also measure abiotic conditions such as temperature, transparency and chlorophyll levels.