EA WQA summary statistics

This layer shows the locations of Environment Agency water quality sampling sites, extracted from the Open WIMS Water Quality Archive, for six key chemical water quality indicators. Each site is linked to its corresponding CaBA Partnership ID. The Open WIMS archive was queried to identify sampling locations associated with major chemical indicators. Data was grouped and pivoted by site, and summary statistics (minimum, mean, and maximum values) were calculated for each year. The annual number of samples per site is also included. Additionally, these sites were compared with those in the Environment Agency’s WFD Classification dataset to identify sampling points that share the same coordinates. The data are symbolised by chemical determinant. The Environment Agency Water Quality Archive provides data from sampling points across England, including rivers, lakes, ponds, canals, estuaries, coastal waters, and groundwaters. Sampling is carried out for various purposes such as permit compliance, pollution investigations, and routine environmental monitoring. The archive contains data dating back to 2000. This layer includes only data from 2022, 2023, and 2024, and focuses on the following indicators: Orthophosphate, Electrical Conductivity, pH, Ammonia, Dissolved Oxygen, Nitrate and TDS. The full archive is available via the Environment Agency’s Open WIMS website.本图层展示了英国环境署（Environment Agency）的水质采样点位分布，数据提取自开放WIMS水质档案库（Open WIMS Water Quality Archive），覆盖六项关键化学水质指标。每个采样点位均关联其对应的CaBA合作项目编号（CaBA Partnership ID）。 研究人员通过检索开放WIMS档案库，筛选出与主要化学指标相关的采样点位。随后按采样点位对数据进行分组与透视转换，并逐年计算各项指标的汇总统计量（最小值、均值与最大值），同时纳入各点位的年度采样总次数。 此外，本图层将上述点位与英国环境署的水框架指令（WFD，Water Framework Directive）分类数据集进行比对，以识别坐标完全一致的采样点。数据按化学检测指标进行符号化展示。 英国环境署水质档案库收录了英格兰境内各类采样点的数据，涵盖河流、湖泊、池塘、运河、河口、近岸海域及地下水。采样工作出于多种目的开展，包括许可合规核查、污染调查及常规环境监测。该档案库的数据最早可追溯至2000年。 本图层仅纳入2022年、2023年及2024年的数据，聚焦以下六项指标：正磷酸盐（Orthophosphate）、电导率（Electrical Conductivity）、pH值、氨（Ammonia）、溶解氧（Dissolved Oxygen）、硝酸盐（Nitrate）及总溶解固体（TDS，Total Dissolved Solids）。完整档案库可通过英国环境署的开放WIMS官网获取。