BGS GeoIndex - Hydrogeology data theme (OGC WxS INSPIRE)

The hydrogeological map indicates aquifer potential in generalised terms using a threefold division of geological formations: those in which intergranular flow in the saturated zone is dominant, those in which flow is controlled by fissures or discontinuities and less permeable formations including aquifers concealed at depth beneath covering layers. Highly productive aquifers are distinguished from those that are only of local importance or have no significant groundwater. Within each of these classes the strata are grouped together according to age or lithology. The 1:625 000 scale data may be used as a guide to the aquifers at a regional or national level, but should not be relied on for local information.本水文地质图通过对地质地层进行三重分类，以概化方式标注含水层潜力：包括饱和带内粒间渗流占主导的地层、渗流受裂隙或不连续面控制的地层，以及渗透性较弱的地层（涵盖被覆盖层深埋的含水层）。本图将高产含水层与仅具局部重要性或无显著地下水资源的含水层加以区分。上述每一类地层均按年代或岩性进行归并。该1:625000比例尺的数据可作为区域或国家级尺度含水层研究的参考依据，但不可作为局部水文信息的可靠依据。