Event Duration Monitoring - Storm Overflows - Annual Returns

Published by:
Environment Agency
Last updated:
27 March 2025
Topic:
Not added
Licence:
Other Licence
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Summary

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 (2024, 2023, 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 sixth data file contains the annual key summary data from respective years plus a table showing long-term trends from 2016-2024. Attribution statement: © Environment Agency copyright and/or database right 2025. All rights reserved.

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Data links

Link to the data Format File added Data preview
Storm Overflow - Spill Frequency Portal: Event Duration Monitoring (EDM) Data N/A 27 March 2025 Not available
EDM_Long-term_Trends_Storm_Overflow_Annual_Return.zip ZIP 27 March 2025 Not available
EDM_2024_Storm_Overflow_Annual_Return.zip ZIP 27 March 2025 Not available
EDM_2023_Storm_Overflow_Annual_Return.zip ZIP 27 March 2025 Not available
EDM_2022_Storm_Overflow_Annual_Return.zip ZIP 27 March 2025 Not available

Additional information

View additional metadata
Added to data.gov.uk
2025-03-27
Access contraints
There are no public access constraints to this data. Use of this data is subject to the licence identified.
Harvest GUID
21e15f12-0df8-4bfc-b763-45226c16a8ac
Extent
Latitude: 55.816° to °
Longitude: -6.236° to 2.072°
Spatial reference system
http://www.opengis.net/def/crs/EPSG/0/27700
Dataset reference date
2021-03-30 (creation)
2025-03-27 (revision)
Frequency of update
annually
Responsible party
Environment Agency (pointOfContact)
ISO 19139 resource type
dataset
Metadata language
eng
Source Metadata
XML
HTML

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Licence information

Open Government Licence