Event Duration Monitoring - Storm Overflows - 2020 (England and Wales)

The dataset includes Water and Sewerage Company with storm overflows in England and Wales, describing how often and for how long, monitored storm overflows discharged during 2020. The Water and Sewerage Companies in England provide this regulatory return to the Environment Agency each year to fulfil their permitted conditions to discharge from these storm overflows under the Environmental Permitting Regulations. The English data were downloaded from data.gov.uk and permit numbers were used to extract locations from the Consented Discharges to Controlled Waters database in order to extract the location of each monitoring point. Sewer Storm Overflow EDM Spill Duration Data for Wales are published as a list, and location data were provided by Dŵr Cymru/Welsh Water on request so could be included in the map without the need for any pre-processing. Some EDM returns had multiple meters on a single discharge activity, so in this case we have taken the higher of the reported spill count as the value, unless the comment indicates that the meter is not working properly in which case we nulled the value. The EDM returns Activity Reference field did not reliably distinguish between emergency overflows and storm overflows so we have included all overflows in the sewer storm overflows category. Approximately 7% of the English EDM records could not be matched to a permit number in the consented discharges database to extract a location and so have been excluded from this spatial dataset. Quality Control The Rivers Trust has endeavoured to clean, check and interpret the data, but cannot be held responsible for any missing or inaccurate data. Locations for English data have been taken from the EA consented discharge database. Points in the sea may be long-sea outfalls or they may be errors in the data. Please contact the Environment Agency with specific location queries. Water companies, citizen scientists and others are welcome to contact us to notify any known data errors on specific overflows and we will flag these in the map popups. We are providing feedback to the Defra storm overflows taskforce about how to improve transparency around sewer storm overflows, and would welcome feedback and suggestions. [e-mail]本数据集涵盖英格兰与威尔士地区设有暴雨溢流设施的供水与污水处理公司相关数据，记录了2020年期间监测到的暴雨溢流排放频次与持续时长。英格兰地区的供水与污水处理公司需依据《环境许可条例》，每年向环境署（Environment Agency）提交此类监管申报文件，以满足其暴雨溢流排放的许可条件。英格兰地区的数据下载自data.gov.uk，通过许可编号从《获批受控水域排放》（Consented Discharges to Controlled Waters）数据库中提取各监测点的位置信息。威尔士地区的下水道暴雨溢流EDM溢流时长数据以列表形式发布，其位置数据由威尔士水务（Dŵr Cymru/Welsh Water）应要求提供，因此可直接用于地图制作，无需额外预处理。部分EDM申报文件中，单次排放活动关联多台监测设备，此种情况下我们采用上报的溢流次数最大值作为最终数值；若备注显示设备运行异常，则将该数值置为空值。EDM申报文件的活动参考字段无法可靠区分紧急溢流与暴雨溢流，因此我们将所有溢流均归类至下水道暴雨溢流类别中。英格兰地区约7%的EDM记录无法在获批排放数据库中匹配到对应的许可编号以提取位置信息，因此已从本次空间数据集中剔除。数据质控：河流信托基金（The Rivers Trust）已尽力对数据进行清洗、核查与解读，但不对任何缺失或不准确的数据承担责任。英格兰地区数据的位置信息取自环境署获批排放数据库。海域中的点位可能为远海排污口，也可能是数据错误。若有具体点位相关的疑问，请联系环境署。欢迎供水公司、公民科学家及其他人士联系我们，告知特定溢流事件中已知的数据错误，我们将在地图弹窗中标记此类问题。我们正就提升下水道暴雨溢流透明度的相关改进方案，向英国环境、食品与农村事务部（Defra）暴雨溢流专项工作组反馈，并期待收到各界的反馈与建议。联系邮箱：[e-mail]