Tilting weirs in the sifon crossing of the Linge with the Amsterdam Rhine Canal
Promoting free fish migration is an important measure for the ecological recovery of waters in the River delta. The management area of the Rivierenland Water Board contains a large number of weirs, pumping stations, locks and culverts that form a potential barrier, preventing fish to be able to migrate upstream.
One of these bottlenecks was the weir in the Linge at the place where the Linge crosses the Amsterdam-Rhine Canal with a siphon. On site, the Linge passes under the Amsterdam-Rhine Canal with a siphon. There is a weir just in front of the siphon (on the northeast side of the Amsterdam-Rhine Canal).
Due to limited space, it was not possible to create the fish passage on this side of the Amsterdam-Rhine Canal. That is why the plan was made to move the weir line in the Linge to the south side of the Amsterdam-Rhine Canal and to also create a fish passage at the location of the new weir line.
Two tilting weirs measuring 5 meters wide x 2.5 meters high have been installed in the new weir line, which were designed and produced by KWT Waterbeheer on behalf of the general contractor: Kuiper Infrabouw from Hardinxveld-Giessendam.
The weir construction is equipped with a 3.5 meter high V-shaped rebate together with adjustable pads on the tilting weirs. The 8-ton tilting weirs can be easily pulled and placed during maintenance work and in the event of an emergency.
KWT has completely calculated the weir and V rebate construction in accordance with the applicable legal requirements. On this basis, a structurally safe weir valve has been produced. The Rivierenland Water Board is satisfied with the work delivered by KWT (in collaboration with De Kuiper Infrabouw).
Based on my experiences, I can recommend KWT to other potential clients. (translated from Dutch)
