the ADASEA du Gers monitors flood episodes by establishing a register of floods and recording area submersed, noting the duration of the flood, submersion extension and nature of the submerged areas with the associated water levels.
Floral monitoring is carried out each year by the national botanical conservatory of Midi-Pyrénées to watch the meadow's evolution.
Design & implementations
|Activity stage||Key issues||Name||Comments|
|Land use change type|
Lessons, risks, implications...
|Success factor type||Success factor role||Comments|
The main opportunities were the involvement of farmers who were "donors" of the hay that was used to seed the prairie. The CCGT was a driving force behind the project, notably through its environmental officer. The presence of a drinking water catchment area and an urban floodplain downstream of the meadow favoured the project's emergence. The funding provided by the Water Agency also facilitated the project, in particular by allowing the involvement of all stakeholders beyond the renewal of individuals and elected officials.
|Barrier type||Barrier role||Comments|
The land aquisition took longer than expected end flooding events lead to delays in the work. Work could not be started as planned, the meadow had to be sown with ryegrass for one year, the flower hay could not be used as planned immediately after harvesting but 3 month later (less favourable to keep the entire seed bank) and a flooding event just after the spreading lead to lose part of the hay.
|Driver type||Driver role||Comments|
Availability of subsidies
The water agency and FEDER subsidies allowed mobilise all actors necessary for the project.
Past flooding events
A wetland already recognised in the surrounding, an abstraction well sensitive to diffuse pollution, and the risk associated with the downstream urban area sensitive to flooding (floodable)
|Financing share type||Share||Comments|
Policy, general governance and design targets
The area is flooded regularly, and is totally submerged every 5 years on average.
Objectives of the NWRM:
Protect the downstream drinking water abstraction well.
Increase the storage capacity of a flood expansion area.
Promote the typical biodiversity of wet grasslands.
Preserve the quality of the living environment and landscape.
|Pressure directive||Relevant pressure|
|Policy area type||Policy area focus||Name||Comments|
|Impact directive||Relevant impact|
|Wider plan type||Wider plan focus||Name||Comments|
Monitoring shows the evolution of plant communities towards natural grassland species. Ryegrass dominated regrowth in 2014, before declining sharply the following year to make way for natural grassland species. As at Spring 2018, the floristic composition is thus close to a natural meadow.
The flora that has developed is mesophilic, even in the detention ponds. This may be due to relatively dry years after planting, particularly 2016 and 2017.