Nieuwe Zeesluis (hydrogeology)

After almost 100 years the Noordersluis in IJmuiden is in need of replacement. A new, larger sea lock should improve the accessibility of the port of Amsterdam and stimulate the economy in the region by offering tidal-independent space to the constantly growing sea-going vessels. The new sea lock will be 70 metres wide, 500 metres long and 18 metres deep. The lifespan of the new lock is 100 years.

Rijkswaterstaat has awarded the construction of the new IJmuiden sea lock at the entrance to the North Sea Canal to the OpenIJ consortium. This consortium-consisting of BAM-PGGM, VolkerWessels and DIF- is responsible for the design, construction, financing and maintenance of the new sea lock for 26 years.

For the new sea lock in IJmuiden, work is carried out almost continuously below the groundwater level. This involves the works ranging from five large excavation pits within sheet piling (which can be seen in aerial photographs) to small excavations e.g for the construction of a fish passage. CRUX Engineering supports the ‘’combinatie OpenIJ’’ in the field of geohydrology regarding the request for extension of the water permit. This involves the calculation and analysis of drainage, flow and environmental effects.

Due to the large amount of work there is a continuous overlapping in the dewatering activities and the environmental effects. In this respect, CRUX plays a supportive role with the drainage party: Van Kessel Bronbemaling.
Due to the size and complexity of the work, water issues are not limited to the dewatering of a dry construction pit. Some examples of the water issues are:
• Controlling the water pressure in the embankment during vibration works
• The times of repetition of the high water in the Estuary and the consequences of this on the (ground) water levels
• Expected discharge of salt mass during the sinking of the caissons

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