Groundwater Masses - Whole France - Version Rapportage 2010

A body of groundwater is a separate volume of groundwater within one or more aquifers, constituting the basic delineation of aquatic environments intended to be the unit of assessment for the WFD. It makes it possible to define environmental objectives, to assess the state of the environment and subsequently to verify the achievement of these objectives. Groundwater bodies, based on the work carried out on the BDRHF V1 hydrogeological repository, were identified and delineated for the first time in 2004 and were updated in 2010. They were the subject of a report to the European Commission on the implementation of the WFD on 22 March 2010, followed by a corrective report in February 2011, taking into account the latest updates. A draft version defined for the 2013 state of play was published in 2015. The version now available on the SANDRE website is in line with the 2016 report. The next version of the Water mass reference system (provisional water bodies, defined for the State of Places) is planned for 2019. Layers shall be distributed in a format consistent with the SANDRE Data Dictionary of the Water Body Repository, version 1.3. The water bodies are divided according to the following main principles: Water bodies shall be demarcated on the basis of geological and hydrogeological criteria. Redistribution of water bodies to take account of the effects of anthropogenic pressures must remain limited. Boundaries of water bodies must be stable and sustainable Like bodies of surface water, the delimitation of bodies of groundwater is organised on the basis of a typology. This typology is largely inspired by the one developed for hydrogeological entities defined in the context of the revision of the HFR DB. It is based on the geological nature and hydrodynamic behavior or "large" operation of aquifer systems (nature, flow velocity). It includes two levels of characteristics, primary and secondary. Water bodies can trade with each other. All abstractions for drinking water supply, supplying more than 10 m3/day of drinking water or used for the supply of water to more than 50 persons, must be included in a body of water. Deep groundwater, unrelated to rivers and surface ecosystems, from which no abstraction takes place and which is not likely to be used for drinking water because of its quality (salinity, temperature, etc.), or for technical and economic reasons (disproportionate cost of abstraction) may not constitute water bodies. Given its size, a body of water may have a certain spatial heterogeneity in terms of both its hydrogeological characteristics and its qualitative and quantitative status. At any point several water bodies may overlap.