The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal extent
This is a polygon dataset showing Water Framework Directive (WFD) River Water Body Catchments. The catchments are associated with a single river water body. This dataset also contains coastal...
Situation 2002 L'AESN (Agence de l'Eau Seine Normandie), en partenariat avec l'Institut Paris Region a fait numériser l'hydrographie de surface de la Région Ile de France à partir des cartes IGN au 1/
