Groundwater body

A groundwater body (GWL) is as defined in the Water Framework Directive (WFD): a separate groundwater mass with an unambiguous chemical and quantitative status. The WFD has several possibilities for the way in which groundwater bodies are limited. In the Netherlands, the geological structure of the bodies of groundwater, groundwater flow and administrative boundaries is used. Due to the absence of geological barriers, the various groundwater bodies in the various sub-basins are large in size. Each GWL should be able to be allocated to a (1) river basin and per GWL it should be clear whether the objectives of the WFD can be met. Two groundwater bodies are present in Overijssel. A groundwater body with a coating (Rhine-East NLGW0010) and a sand-groundwater body without coating (Sand Rhine-East NLGW0003). The two bodies of groundwater are subject to thresholds and Community standards for groundwater quality. Standards for groundwater quantity also apply.地下水体（groundwater body, GWL）的定义符合《水框架指令》（Water Framework Directive, WFD）：即具备明确化学属性与水文定量特征的独立地下水体。《水框架指令》（WFD）规定了多种地下水体边界的划定方式。在荷兰，地下水体的边界划定依据包括地下水的地质构造、地下水流场与行政边界。由于缺乏地质屏障，各子流域内的各类地下水体规模普遍较大。每一处地下水体（GWL）均需被划归至某一河流流域，且需明确该地下水体是否可达成《水框架指令》（WFD）设定的目标。上艾瑟尔省（Overijssel）境内共分布两处地下水体，分别为带有覆盖层的地下水体（莱茵东部 NLGW0010）与无覆盖层的砂质地下水体（砂质莱茵东部 NLGW0003）。这两处地下水体均需遵循地下水水质阈值与欧共体地下水水质标准，同时也需执行地下水水量相关标准。