dataset · England
Event Duration Monitoring-Storm Overflow-Start/Stop Detailed Data
This Water Company data shows storm overflow event duration monitor activations. The activations are recorded at the start and the stop of each potential discharge. The data has not been subject to any formal verification by the Environment Agency. The data covers all 10 water and Sewerage companies that operate in England. The data is split into Water Companies and each spreadsheet covers one calendar year. Attribution statement: © Environment Agency copyright and/or database right 2026. All ri
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Licence: ["There are no public access constraints to this data. Use of this data is subject to the licence identified.", "There are no public access constraints to this data. Use of this data is subject to the
Evidence quality: 47.7
Listed in data.gov.uk public catalogue API on 2026-10-16; relevance/value screened (haiku).
Metadata checked: 2026-10-14T13:20:00.000Z
What's in it
- Data offered docs-verified
- storm overflow event duration monitor activations · start and stop of each potential discharge
- Coverage llm-inferred
- England · One calendar year per spreadsheet; files listed for 2024, 2025 and 2026
- Update frequency docs-verified
- annually
- Formats docs-verified
- XLSX · CSV
- Access docs-verified
- Free and open under the Open Government Licence; no public access constraints; no API key or auth listed
Useful for
- Use cases llm-inferred
- Screen storm overflow spill activity in a catchment as a water quality risk input for an FRA or drainage strategy · Gather evidence of existing combined sewer overflow activity near a development site for environmental due diligence · Build a yearly overflow activation baseline by water company for a WFD or permit-related assessment
- Audience llm-inferred
- environmental consultants · drainage engineers · hydrologists · water quality specialists · planners
Limitations
- Constraints docs-verified
- Not subject to formal verification by the Environment Agency · Covers England only
Evidence
- https://environment.data.gov.uk/api/file/download?fileDataSetId=c95ecc47-fa70-4a24-b8cc-098232987526&fileName=Anglian 2024 Detailed EDM Data.xlsx
- https://www.data.gov.uk/dataset/39ba1e24-69ca-4031-badf-e02649b74a7b/event-duration-monitoring-storm-overflow-start-stop-detailed-data
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.