Water use related to the Voelckel Dam having ceased, and there being significant risk of flooding, the site was completely redeveloped, with the aim of improving the watercourse’s ecological continuity, managing the distribution of the outflow, at both high and low water, and improving water quality.
The solution implemented is particularly innovative inasmuch as it involved rerouting the entire main riverbed in order to bypass the former cut-stone dam (a historical heritage item that the local authority wished to preserve). This redevelopment therefore made it possible to reconstitute an entire, fully functioning section of river, that could easily be crossed by all benthic fauna whilst, at the same time, partially preserving the retaining effects of the former dam to feed a secondary arm of the river.
Creation of a 160 metre long river to bypass the dam. Two ramps made up of staggered rip-rap ensure perfect ecological continuity for the river as a whole.
Observation of a fish pass made up of staggered rock dumps, stabilisation of the riverbed using both mineral and plant techniques, consolidation of the banks by means of planting of trees and shrubs.
Work carried out in 2010. The investment in this project was 131,000 euros.
ARTELIA VILLE ET TRANSPORT
AGENCE DE STRASBOURG 15 avenue de l'Europe 67300 Schiltigheim
Players involved and their roles
SYNDICAT INTERCOMMUNAL D'AMENAGEMENT DE LA HAUTE ZORN
CONSEIL GENERAL AERM