Approach
Vessels with a draft of more than 14 metres should use the IJgeul.
To protect access to the channel jetties were built in the sea.
In 1957 the Delft Hydraulics Laboratory began research for the best solution. The result was two jettties with 500 m difference in length between the southern and the northern one. The length of the north pier should be 1500 m to 2500 m and the south jetty of about 3000 m. This is to prevent the silting of the entrance channel and to ensure that vessels entering suffer less from the prevailing south-west and north-south flow along the coast.
Read more about this topic: North Sea Canal
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