Information on increased water storage:
The water is stored in watercourses inside the polder and in case of retention also in the forest.
Information on runoff reduction:
Information on Peak flow rate reduction:
During the last flood on the Upper Rhine in the 90's, the water retention inside the polder led to a reduction of the gauge of 24 cm and avoided thus the inondation of important industrial cities (Karlsruhe, Speyer, Mannheim).
Information on Increased groundwater level:
Ecological Flooding leads to rising groundwater levels outisde the polder that can affect property. Therfore a complex drainage system including channels, wells,lakes and pumping stations was created.
Information on Restoring hydraulic connections:
In order to distribute evenly water inside the polder, a system of water courses was reconnected and restored, the so called Schluten
Water quality overall improvements:
Negative impact-WQ deterioration
Information on Water quality overall improvements:
Measurements have shown that the overall water quality of the Rhine deteriorates when the water passes the polder. However, no danger for the drinking water supply exists.
Soil quality overall soil improvements:
Positive impact-SQ improvement
Information on Soil quality overall soil improvements:
Due to ecological flooding, the forest soil is constantly enriched by organic sediments serving as fertilizer for the plants.