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Fourth field visit of WP1

Report of the fourth field visit of WP1. The partners visited the fish passage in Maffle on the Eastern Dender. The second and third locations visited were the waterfall with several thresholds under a bridge and a valve weir, which feeds a water mill, in Mévergnies.

Restore free fish migration Eastern Dender.

Photo 12: Fourth field visit of WP1: PresentationThe field visit started in the morning with a presentation of the general framework of free fish migration in the Wallon Region. The presentation contained a brief overview of the Walloon legislation regarding the free fish migration, the Walloon inventory of the bottlenecks and the status of the Walloon part of the Scheldt basin, more specifically the part where the afternoon excursion in the Dender basin took place.

The second presentation was proposed by Gersande Blanchard, William Philippe and Gisèle Verniers from the Walloon Region. They presented the complete inventory of the obstacles for the free fish migration in all basins of the rivers Dender, Senne, Grote Gete and Kleine Gete were discussed. Photo 13: Fourth field visit of WP1: PresentationThese works are now in the final stage.
The final presentation treated the executed constructions regarding the free fish migration both upstream and downstream and the inventarisation of the fish passages which gave an overview of three bottlenecks which the group visited in the afternoon.

In the afternoon the group travelled to the Eastern Dender at Ath to different places where fish migration bottlenecks will be eliminated within the ScaldWIN project.

Photo 14: Fourth field visit of WP1: PumpFirst the Maffle bottleneck in the Eastern Dender was visited. This is an automatic flood-control dam which was built from a basin and water supply in a channel surface to feed a pump serving the ‘Canal de Blaton’. The dam works automatic and is operated by DCENN. The proposed solution to remove this bottleneck is to lower the valve on regular an automatic basis.
The administratior of ‘Canal de Blaton’ was also present and demonstrated the pumping-engine which feeds this canal.

 

Photo 15: Fourth field visit of WP1: Water millAfterthis, the Group visited the next bottleneck in Attre; a waterfall with several thresholds under a bridge. The last visited bottleneck is located in Mévergnies: a valve weir which feeds a water mill. A study is being carried out to find a solution for both locations.