The Old Kergoff lake

Dug in 1972 in a damp wooded area, the Kergoff ornamental lake, fed by the Le Plessis stream, was drained in September 2018. Like many bodies of water, it suffered from silting and warming of its waters, which in the summer months caused green algae blooms on the surface, hindering the migration and reproduction of salmon, trout and eels.

The emptying of the lake, destruction of the dyke and its replacement by a rigid-framed bridge, restored ecological continuity and promoted the fauna and flora on the banks. The works also restored this wetland to its natural function of regulating the water cycle, storing rainwater in winter, limiting flooding, and releasing it during dry periods. Acting like a natural filter, the soil and plants that grew back here help to improve the quality of the water by eliminating pollution. The wetlands have been inventoried and are now protected. In Caudan, they make up 362 ha, or 8.5% of its surface area.

This walking area, popular with the inhabitants of Caudan, has also been restored with paths accessible to People of Reduced Mobility, a wooden footbridge between the two banks, a playground and equipment along the banks. There is a landscaped rainwater retention basin with a pier for visitors to stroll it along while observing the biodiversity of this fledgling pond.