BGS Permeability version 8

The BGS Permeability data product shows estimated rates of water movement from the ground surface to the water table. BGS Permeability version 8 incorporates the latest geology mapping (BGS Geology 50k). This includes updates to the lithology-coding schema, the LEX_RCS. A 2-part code used to identify the named rock unit from the BGS lexicon of named rock units (LEX) followed by a Rock Classification Scheme (RCS) code which describes the rocks lithological characteristics e.g. texture and composition. Updates to these codes and latest dissolution hazard data sourced from BGS GeoSure: Soluble Rocks have been reviewed and classified as part of the version 8 release. The product covers Great Britain and is presented at a scale of 1:50 000, based on the geological data at the same scale. However, in areas where the geology is not mapped to this scale, the next best available scale is used. The BGS Permeability data product can be used to compare the relative permeability of deposits at the regional scale, indicating where highly permeable rocks could allow rapid infiltration to occur, or where less permeable rocks are present and water could pond on the ground surface. The dataset can be used as a component in a wide range of geo-environmental assessments such as natural flood management, Sustainable Drainage Systems, engineering desk studies, slope stability, and aquifer vulnerability. It is for use at the regional scale and is not recommended for use at the site-specific scale.英国地质调查局（British Geological Survey，BGS）渗透率数据产品展示了地表至地下水位的水分运移估算速率。BGS渗透率第8版整合了最新地质填图成果（BGS 1:5万地质图），该更新涵盖岩性编码方案LEX_RCS的修订。LEX_RCS为双段式编码：第一段取自BGS岩石命名词库（LEX）以识别指定岩石单元，第二段为岩石分类方案（Rock Classification Scheme，RCS）代码，用于描述岩石的岩性特征（如结构与成分）。本次第8版更新还对上述编码进行了修订，并整合了源自BGS GeoSure项目《可溶性岩石》的最新溶蚀危险性数据，相关数据已完成审核与分类。 该数据产品覆盖英国全境，基于同比例尺地质数据以1:5万比例尺发布；但在未完成该比例尺地质填图的区域，则采用精度最高的可用替代比例尺。 本渗透率数据产品可用于对比区域尺度下各类沉积物的相对渗透率，以此标识高渗透率岩石区域（易发生快速入渗）与低渗透率岩石区域（易导致地表水汇积）。该数据集可作为核心组件应用于各类地质环境评估工作，包括自然洪水管理、可持续排水系统（Sustainable Drainage Systems）、工程案头研究、边坡稳定性分析以及含水层脆弱性评估等。本产品仅适用于区域尺度分析，不建议用于场地特定尺度的评估工作。