The polluted sediments settled to the bottom of Ketelmeer in a thick layer of contaminated sludge.
The IJsselmeer also offers a number of opportunities for recreational activities such as yacht sailing.
Photo credit
In the 1994 a decision was made to remove the polluted sediments from the lakebed.
There was, however, the problem of disposal.
IJsseloog was constructed between 1996 and 1999.
The pit is surrounded by a ten-meter-high embankment.
The cleansed sand will be used for construction at other locations.
The dredging operation started in 2000 and is expected to take 20 years to complete.
