Groundwater bodies - Guadeloupe - State of the Places Version 2019

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. Groundwater bodies are derived from work done on the BDLISA repository. The water bodies are divided according to the following main principles: - Water bodies are defined on the basis of geological and hydrogeological criteria; - Redistribution of water bodies to take account of the effects of anthropogenic pressures must remain limited; - The 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 BDLISA revision. It is based on the geological nature and hydrodynamic behavior or "large" operation of aquifer systems (nature, flow velocity). It comprises two levels of characteristics (main and secondary); - Water bodies may trade with each other; - All water withdrawals for drinking water supplying more than 10 m3/day or used to supply 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 unlikely 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 both in terms of its hydrogeological characteristics and its qualitative and quantitative status; - At any point several water bodies may overlap. (source: according to BRGM, IMPLEMENTATION OF THE WFD: IDENTIFICATION AND DELIMITATION OF SOUTHWATER MASSES - methodological guide, January 2003) WFD reporting correspondence: This entity corresponds to WISE's Ground Water Body (GWB) concept. Layers shall be disseminated in a format compliant with the SANDRE Data Dictionary of the Water Body Repository, version 1.4.地下水体（groundwater body）是指赋存于一个或多个含水层（aquifer）内的独立地下水体积，是《水框架指令》（Water Framework Directive, WFD）评估单元所对应的水生环境基本划定单元。 地下水体的划定工作源自BDLISA知识库（BDLISA repository）的相关研究成果。 地下水体的划定遵循以下核心原则： - 地下水体以地质与水文地质（hydrogeological）标准为依据进行划定； - 为考量人为活动压力影响而开展的水体重新划定工作，需严格控制调整范围； - 地下水体边界需具备稳定性与可持续性； - 与地表水水体类似，地下水体的划定基于类型学框架开展。该类型学很大程度上借鉴了BDLISA修订版中定义的水文地质实体分类体系，以含水层系统的地质属性、水动力特征或“宏观”运行特性（如介质类型、水流速度）为基础，包含两级特征层级（主特征与次特征）； - 不同地下水体之间可发生水力联系； - 所有日取水量超过10立方米，或供水服务人数超过50人的饮用水取水工程，均需纳入某一地下水体范畴； - 与河流及地表生态系统无关联、无取水活动，且因水质问题（如盐度、温度等）或技术经济原因（取水成本过高）而不适用于饮用水用途的深层地下水，可不划定为地下水体； - 受自身规模影响，地下水体在水文地质特征、水质与水量状态上可能存在一定空间异质性； - 任意空间点位可能存在多个地下水体重叠的情况。 （数据来源：法国地质和矿产资源调查局（BRGM），《水框架指令实施：西南水体的识别与划定——方法学指南》，2003年1月） 水框架指令报送对应关系：该实体与WISE的地下水体（Ground Water Body, GWB）概念一致。 数据图层需采用符合《SANDRE水体库数据字典（SANDRE Data Dictionary of the Water Body Repository）》1.4版标准的格式进行发布。