Project management for theecological recoveryof the'Follet pond
Cession (77)
Regional nature reserve
The classification of L'Etang du Follet has been classified as a Regional Nature Reserve since May 18, 2005. Located downstream from a network of 54 retention basins, the Follet basin was dug in 1976 in the bed of the Ru de Balory in order to to manage rainwater, in terms of its flow and quality.
Reprofiling of the banks
At the time of its creation, the banks of Le Follet were largely over-deepened with relatively steep slopes at the level of contact with the water. The artificial profile of the basin gave the banks an abrupt character falling at a sheer depth between 1 and 1.50 meters from the edge of the bank.
The development operation consisted of reshaping the toe of the western and northern banks to reduce the slope in contact with the water. This reshaping operation subsequently enabled two major interventions to be carried out on the site: the restoration and increase in the surface area of the existing reed bed on the western banks, an intervention made possible by bringing the water back to the of the bank and the creation of a shoal zone at the level of the northern banks of the Reserve consisting of a muddy bench of sand ideal for breeding and wintering.
Restoration of the existing reed bed
At the border of aquatic life and terrestrial life, the reed bed is home to a diversified flora and fauna. In the Bassin du Follet, it is the preferred habitat of many species of birds such as the scarlet reed warbler, but also a place for amphibians and odonates. The challenge was to increase, protect and maintain the existing reedbed: This involved extending the existing reedbed to the north of the pond at the level of the arrival of the tributaries from the stream in order to develop biodiversity and improve pond water quality through vegetation by increasing natural filtration and purification through vegetation. The intervention was carried out by land (much less expensive than an intervention by means of a floating device).
Creating a shoal area
The Ru de Balory opens into the Follet pond (north side) via a small canal. The northern banks are a particularly interesting environment because the water is shallow and the area relatively calm. The operation provided for the development of a sparsely vegetated shoal area forming a muddy bench of sand. This environment is ideal for nesters such as the mallard present on the reserve or even the Northern Shoveler, the Teal, as well as for migrants or wintering birds such as waders or ducks. These shoals also act as spawning grounds.
Owner:SAN DE SENART
Place :Cession (77)
Partners:
Ecosphere (BET ecology - sustainable development)
Total amount of work:€60,000 excluding tax
Completion date:2011