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The Drontermeer (600 ha) and the Veluwemeer (3400 ha) were separated from Lake IJssel by dikes and locks in 1957. The Wolderwijd (2600 ha), the Eemmeer (1900 ha), and the Gooimeer (2400 ha) were formed in the same way in 1967. The Drontermeer and the Veluwemeer are in open connection with each other. Shiplocks separate these lakes from the adjacent lakes. The Wolderwijd is separated from the Veluwemeer and the Eemmeer by locks. The Eemmeer and the Gooimeer are in open connection with Lake IJssel. Average depth of the lakes is about 1.50 m. A ship canal with a width of 100 m and a depth of 4 m has been dug through the lakes. Refreshment time for all lakes is about two months. The lakes are polluted by domestic and dairy wastes. The Wolderwijd is polluted only by dairy wastes. The phosphorus load of the Drontermeer and the Veluwemeer is about 4 to 5 g P/m2/year; of the Wolderwijd, less than 3 g P; and of the Eemmeer and Gooimeer, 20 to 30 g P/m2/year.
Aquatic Ecology – Springer Journals
Published: Nov 5, 2005
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