YW Night-flow monitoring 2024

Data History Data Origin Companies have configured their networks to be able to continuously monitor night flows using district meters. Flow data is recorded on meters and normally transmitted daily to a data centre. Data is analysed to confirm its validity and used to derive continuous night flow in each monitored area. Data Triage Considerations Data Quality Not all DMAs provide quality data for the purposes of trend analysis. It was decided that water companies should choose 10% of their DMAs to be represented in this data set to begin with. The advice to publishers is to choose those with reliable and consistent telemetry, indicative of genuine low demand during measurement times and not revealing of sensitive night usage patterns. Data Consistency There is a concern that companies measure flow allowance for legitimate night use and/or potential night use differently. To avoid any inconsistency, it was decided that we would share the net flow. Critical National Infrastructure The release of boundary data for district metered areas has been deemed to be revealing of Critical National Infrastructure. Because of this, it has been decided that the data set shall only contain point data from a centroid within the DMA. Data Triage Review Frequency Every 12 months, unless otherwise requested. Data Limitations Some of the flow recorded may be legitimate night-time usage of the network. Some measuring systems automatically infill estimated measurements where none have been received via telemetry. These estimates are based on past flow. The reason for a fluctuation in night flow may not be determined by this dataset but potential causes can include seasonal variation in night-time water usage and mains bursts. Data Publish Frequency Monthly. Supplementary information Below is a curated selection of links for additional reading, which provide a deeper understanding of this dataset. 1. Ofwat – Reporting Guidance https://www.ofwat.gov.uk/wp-content/uploads/2018/03/Reporting-guidance-leakage.pdf 2. Water UK – UK Leakage https://www.water.org.uk/wp-content/uploads/2022/03/Water-UK-A-leakage-Routemap-to-2050.pdf Data Schema DATA_SOURCE: Company that owns the DMA DATE/TIME_STAMP: Date and time of measured net flow DMA_ID: Identity of the district metered area CENTROID_X: DMA centroid X coordinate CENTROID_Y : DMA centroid Y coordinate ACTUAL_MIN_NIGHT_FLOW: The lowest recorded average net flow between 12 and 6am MIN_NIGHT_FLOW : The average flow within the 2-4 am time window UNITS: Measurement of flow数据历史与数据来源 各供水企业已配置其管网系统，可通过分区计量区域（DMA, District Metered Area）的计量仪表持续监测夜间流量。流量数据由仪表记录，通常每日传输至数据中心。对数据进行分析以确认其有效性，并据此推导各监测区域的连续夜间流量。 数据筛选考量 数据质量 并非所有分区计量区域（DMA, District Metered Area）都能提供适用于趋势分析的高质量数据。因此确定，供水企业首批应选取其10%的分区计量区域纳入本数据集。对数据发布方的建议是，选取具备可靠且稳定遥测（telemetry）技术的区域，此类区域在测量时段内呈现真实的低用水需求特征，且不会泄露敏感的夜间用水模式。 数据一致性 存在一项顾虑：各企业对合法夜间用水及/或潜在夜间用水的流量配额核算方式存在差异。为避免出现不一致性，最终确定仅共享净流量（net flow）数据。 关键国家基础设施 分区计量区域的边界数据被认为会泄露关键国家基础设施信息。因此，本数据集仅可包含分区计量区域质心的点位数据。 数据遴选复核频次 每12个月复核一次，另有要求的情况除外。 数据局限性 所记录的部分流量可能属于管网的合法夜间用水。部分计量系统会在未通过遥测接收到数据时，自动填充基于历史流量生成的估算值，此类估算基于历史流量数据。本数据集无法确定夜间流量波动的具体成因，但潜在诱因可能包括夜间用水的季节性变化以及市政管道爆漏。 数据发布频率 月度发布。 补充信息 以下为精选的补充阅读链接，可帮助您更深入地理解本数据集： 1. 英国水务监管办公室（Ofwat）——报告指南 https://www.ofwat.gov.uk/wp-content/uploads/2018/03/Reporting-guidance-leakage.pdf 2. 英国水务协会（Water UK）——英国漏损控制 https://www.water.org.uk/wp-content/uploads/2022/03/Water-UK-A-leakage-Routemap-to-2050.pdf 数据模式 数据来源：拥有该分区计量区域的企业 日期/时间戳：实测净流量的日期与时间 DMA标识：分区计量区域的唯一标识 质心X坐标：分区计量区域质心的X轴坐标 质心Y坐标：分区计量区域质心的Y轴坐标 实际夜间最小净流量：12时至6时时段内记录到的最低平均净流量 夜间最小流量：2时至4时时段内的平均流量 单位：流量计量单位