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Lixhe - Weir

At Lixhe, near Liege, we have been awarded the contract by the regional Rivers and Water Authorities (SPW-Voies Hydrauliques Liège) to reinstate the scour protection at the downstream side of the Lixhe weir.

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About 30.000m³ of the existing scour protection had been washed away during periods of extreme waterflow on the River Meuse. The void that had occurred was threatening the stability of the weir.

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The execution of the contract was limited by various restrictions:

  • Working within an environmental sensitive area
  • The weir remained operational during the works
  • A very limited access downstreams to mobilize and demobilize our floating plant
  • The required rock had to be imported over water
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Due to its extensive experience Ghent Dredging has been able to carry out this contract. Local quarries were used to produce the 54.000T of stones required. The imported rock was discharged at the upstream side of the weir, loaded on dumptrucks and, at the downstream side loaded into a split barge.
The split barge was positioned by the use of a spud-legged pontoon, mounted with a 50T digger, equipped with a DGPS positioning system, enabling to place the various sizes of rock accurately.

The rock had to been placed into 3 different layers with 3 different types of stones, i.e. 10/250kg, 450/1000kg and 1000/3000kg.

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