Event Duration Monitoring - Storm Overflows - Annual Returns
This Event Duration Monitoring (EDM) dataset relates to the performance of storm overflows in England. Data are provided by Water and Sewerage Companies (WaSCs) to the Environment Agency each year as part of their regulatory Annual Return, to fulfil their permitted conditions to discharge from these storm overflows under the Environmental Permitting Regulations. Data files are provided by year (2022, 2021 & 2020) and include a sheet for each of the 10 WaSCs with storm overflows in England. Each WaSC sheet shows how often and how long each monitored storm overflow discharged during that year. From 2021 onwards the dataset also includes reasons why event duration monitors (EDM) may have provided information for <90% of the relevant return period, and why an overflow may have high spill counts in that period. These data reflect the best available information held by the WaSC at time of submission. The data file for each year also contains key summary data tables. These include: number of storm overflows with EDM, number of storm overflows returning spill counts, average spill duration and average spill count for each WaSC. A dataset README guide is also provided which provides further information to help use and understand the data. A fourth data file contains the annual key summary data from respective years plus a table showing long-term trends from 2016-2022.
Use limitation statement
There are no public access constraints to this data. Use of this data is subject to the licence identified.
LicenceOpen Government Licence
© Environment Agency copyright and/or database right 2023. All rights reserved.
This Event Duration Monitoring (EDM) dataset relates to the performance of storm overflows. Data are provided by Water and Sewerage Companies (WaSCs) each year as part of their regulatory storm overflow Annual Returns. Summary data and long-term trends are produced from these Returns by the Environment Agency.
Coordinate reference systemhttp://www.opengis.net/def/crs/EPSG/0/27700
- Latitude from: 49.943 to 55.816
- Longitude from: -6.236 to 2.072
Contact publisherDefra Data Services Forum
Dataset reference dates
30 March 2021
31 March 2023
- From: 01 January 2020
- To: 31 December 2022
Data and Supporting Information
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