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Wetted works - raking out

A good seal was needed between the filter bed and the sill blocks. This was achieved by smoothing the top layer of the filter- bed. To this end a steel device with vertical teeth was mounted on the mouth of a dustpan suction-dredger to create a kind of rake. Following the good results obtained with a similar method on Neeltje Jans and in the Petroleum Harbour in the Europort area, this method was also applied in the New Waterway.