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  3. Event Duration Monitoring - Storm Overflows - Annual Returns

Event Duration Monitoring - Storm Overflows - Annual Returns

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 (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 fifth data file contains the annual key summary data from respective years plus a table showing long-term trends from 2016-2023.

Categories

Use limitation statement

There are no public access constraints to this data. Use of this data is subject to the licence identified.

Attribution statement

© Environment Agency copyright and/or database right 2024. All rights reserved.

Technical information

Update frequency

annually

Lineage

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.

Spatial information

Geographic extent

  • Latitude from: 49.943 to 55.816
  • Longitude from: -6.236 to 2.072
Metadata information

Language

English

Metadata identifier

21e15f12-0df8-4bfc-b763-45226c16a8ac


Published by

Environment Agency

Contact publisher

Defra Data Services Forum

Dataset reference dates

Creation date

30 March 2021

Revision date

27 March 2024

Publication date

N/A

Period

  • From: 01 January 2020
  • To: 31 December 2023

Search

Data and Supporting Information
Data services and download by area of interestLinkAction
The Event Duration Monitoring (EDM) - Storm Overflows - Annual Returns dataset in spatial form to improve access to the data. Only includes 2021, 2022 and 2023 datasets.Open link
Full downloads and supporting documentationFormatAction
EDM_2021_Storm_Overflow_Annual_Return.zipZIPDownload
EDM_2022_Storm_Overflow_Annual_Return.zipZIPDownload
EDM_2023_Storm_Overflow_Annual_Return.zipZIPDownload
EDM_Long-term_Trends_Storm_Overflow_Annual_Return.zipZIPDownload
Event_Duration_Monitoring_-_Storm_Overflows_-2020.zipZIPDownload