The major bed of the Save River includes a vast complex of wet meadows directly upstream of the municipality of Isle Jourdain (Gers), located partly in a floodplain area. A water abstraction well is located downstream of this complex for the supply of drinking water to the municipality. In order to reduce the risk of diffuse pollution from catchment, restore wetland habitats and contribute to downstream flood prevention, a 13 hectare parcel, riparian of the Save, was bought by the local community (CCGT) and leased to a farmer with a special contract. The field was converted to permanent natural grassland, and detention basins were dug to increase the storage capacity of the floodplain and development of wet plants community. The technique used for sowing the meadow is the "hay flower", hay from adjacent wetlands harvested late to include a wide seed bank, and makes it possible to obtain a floral procession adapted to the conditions of the meadow. This project has enhanced the natural grassland complex in the major bed of the Save. The project must still be completed by the conversion of another adjacent parcel, still cultivated.

The Chaux forest is a silvicultural production area and is covered by a large number of small streams, originally winding and of small size. In 2008, the LIFE program "Ruisseaux de têtes de bassins et faune patrimoniale associée" ([Pond head creeks and associated heritage fauna]) carried out restoration work at the head of the catchment area on part of the small ditches of the Chaux national forest. Based on the experience and results obtained, the National forest office (ONF) proposed a new project to restore 45 km of watercourses in three 15-km sections (2015, 2017 and 2018) with the objective of significantly restoring the hydraulic functioning of the Clauge and improving the conservation status of the species covered by the Habitats Directive. Indeed, all the temporary tributaries of the Clauge were transformed in the 1960s into deep straight ditches via canalization works.

The project involves the removal of drainage from a wet grassland at the head of a small Breton coastal river watershed in an area subject to nitrogen pressure. Located at the bottom of an hydromorphic valley, the Coat Carriou meadow has been drained by two ditches to allow the plot to be mowed. Collecting runoff from the hillside, the two ditches caused a short circuit in the meadow, leading the nitrate-laden runoff directly to the river stream. The two drainage ditches were filled in with the aim of eliminating the short circuit, allowing all water flowing to spread over the meadow. The aim was to improve the purifying effect of the grassland on the waters from the hillside, while maintaining agricultural activity. The short circuit has effectively been eliminated, allowing all the water on the slope to pass through the wetland where the purifying capacities make it possible to remove all the mineral nitrogen present in the water. As the purification capacities were already optimal before the work, they were not improved, but all water can now be purified. The reduced bearing capacity allow to mow the meadow only in dry years. It has been included in the grazing path of a herd of brittany pie-noir cows, able to graze wet grassland.

The city of Fourqueux (4000 inhabitants) has redesigned its urban space to build social housing. A plot of land has been set up at the heart of this area to collect and manage rainwater from the requalified area. Called water garden, the park collects water from 1.7 hectares of permeable and impervious area to allow it to infiltrate through a succession of temporary basins and a permanent one. It thus avoids the direct discharge of this rainwater into the separative network connected to the Seine. The water garden also acts as a natural space in the heart of a residential area, and allows the history of the municipality to be highlighted through cultural activities and the permanent display of old agricultural machinery.