The purpose of this contract is to carry out a study on the modelling of the hydraulic functioning of subhalophilic grasslands and Grande Crique

for subhalophilic grasslands:The Study includes the creation of a hydraulic model and the realization of an impact study which will have the following objectives:- to understand and analyze the filling and emptying of the marsh at the level of subhalophilic meadows;- to define the location of the water passages and to analyze their impact on the management of water levels, to characterize the possible adaptation measures made necessary on the network and the current operation of the network Hydraulics;- Analyze the impact of this development scenario on natural habitats (phragmites reed beds, subhalophilic meadows) and the associated flora, fauna (in particular avifauna: Marsh Harrier, Bittern). For Grande Crique: The study includes carrying out a diagnosis of the functioning of Grande Crique and recommending corrective measures whose objectives are the sustainability of hydraulic operation. The study will be carried out in two stages: - analysis of the hydraulic and morphological evolution of the filandre from 2005 to the present day with research into the causes of these changes (modification of the outlet, connection with subhalophilic meadows, evacuation of dredging materials, etc.) - Proposal of corrective measures to restore an operation that ensures the sustainability of the Grande Crique from a morphological point of view and the good nutrition of the subhalophilic meadows