Permeability Dataset for Great Britain (Artificial Deposits)

The data comprises GIS layers representing the permeability of artificial deposits for Great Britain. The permeability data has been derived from DiGMap-GB (Digital Geological Map Data of Great Britain), and therefore reflects the scale of DiGMap-GB. For the majority of the Great Britain, the scale is 1:50,000. The data is updated annually, or after a major new release of DiGMap-GB. The permeability data describes the fresh water flow through these deposits and the ability of a lithostratigraphical unit to transmit water. Maximum and minimum permeability indices are given for each geological unit to indicate the range in permeability likely to be encountered and the predominant flow mechanism (fracture or intergranular). Neither of the assigned values takes into account the thickness of either the unsaturated or saturated part of the lithostratigraphical unit. The data can be used freely internally, but is licensed for commercial use. It is best displayed using a desktop GIS, and is available in vector format as ESRI shapefiles and MapInfo TAB files.

本数据集包含代表大不列颠人工沉积物渗透性的地理信息系统（GIS）图层。渗透性数据源自DiGMap-GB（大不列颠数字地质图数据），因此反映了DiGMap-GB的尺度。对于大不列颠的大部分地区，比例尺为1:50,000。数据每年更新一次，或随DiGMap-GB的重大新版本发布而更新。渗透性数据描述了这些沉积物中的淡水流动以及岩性地层单位传输水分的能力。为每个地质单位提供了最大和最小渗透性指数，以指示可能遇到的渗透性范围和主要流动机制（裂缝或粒间）。所赋予的任一值均未考虑岩性地层单位中非饱和或饱和部分厚度。数据可内部自由使用，但授权商业用途。最佳显示方式为桌面GIS，并提供为ESRI形状文件和MapInfo TAB文件的矢量格式。