The preliminary design studies were finalised in June 2014. They mainly focused on the checks and technical details of the development choices. In addition, work was carried out to pinpoint the ecological areas to be recreated and restored within the framework of the project.

For example, a sand/gravel beach intended for fish fauna and to attract the little ringed plover (a water bird) will be created on the south bank, at a precise altimetry so that the projecting shelf is emerged during the springtime for the bird’s nesting period.

Further north, the development of a vast ditch covering almost 1 hectare with the role of regulating the water will play host to water areas of varying depth on three plateaus, creating varied wetlands.