Groundwater body

A groundwater body (GWL) is as defined in the Water Framework Directive (WFD): a separate groundwater mass with an unambiguously defined chemical and quantitative status. The WFD has several options for how groundwater bodies are delimited. In the Netherlands, use is made of the geological structure of groundwater bodies, groundwater flow and administrative boundaries. Due to the absence of geological barriers, the various groundwater bodies in the various sub-basins are large in size. It should be possible to allocate each GWL to a (1) river basin and it should be clear per GWL whether the objectives of the WFD can be achieved. There are two groundwater bodies in Overijssel. A groundwater body with a coating (Rhine-East NLGW0010) and a sand-groundwater body without a coating (Rhine-East NLGW0003). The two groundwater bodies are subject to threshold values and Community standards for groundwater quality. Groundwater quantity standards also apply.

地下水体（groundwater body, GWL）的定义遵循《水框架指令》（Water Framework Directive, WFD）：指具备明确界定的化学与水量状况的独立地下水体。《水框架指令》针对地下水体的划定设有多种可选方案。在荷兰，地下水体的划定依据地质结构、地下水流特征与行政边界开展。由于缺乏地质阻隔屏障，各次级流域内的各类地下水体普遍规模较大。需将每一处地下水体划归至对应的流域，且需明确每一处地下水体是否可达成《水框架指令》设定的相关目标。上艾瑟尔省（Overijssel）境内共有两处地下水体：一类为带有覆盖层的地下水体（莱茵-东部 NLGW0010），另一类为无覆盖层的砂质地下水体（莱茵-东部 NLGW0003）。这两处地下水体均需遵循地下水水质阈值与欧盟共同体水质标准，同时也需执行地下水水量标准。