Environment Agency061WAF24BlkWaterThames
River Blackwater and The Cove Brook: flood history since 2011
The Environment Agency has issued 101 flood alerts for River Blackwater and The Cove Brook since 4 Nov 2011, most often in January; the busiest year was 2024 (12).
Flood alerts only
The flood area
- Flood area
- River Blackwater and The Cove Brook
- Code
- 061WAF24BlkWater
- Environment Agency area
- Thames
- County
- Bracknell Forest, Hampshire, Surrey, Wokingham
- River or sea
- River Blackwater, Cove Brook
- First in the history
- 4 Nov 2011
- Latest in the history file
- 21 Jan 2026
- Current status
- check-for-flooding.service.gov.uk (the Environment Agency's live page)
Flood alert, flood warning, severe flood warning: what each means
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.
How many alerts and warnings a year?
Flood alerts, flood warnings and severe flood warnings (updates not counted), by year. 2026 runs to the end of June.
The numbers
| Year | Alerts | Warnings | Severe |
|---|---|---|---|
| 2026 | 2 | 0 | 0 |
| 2025 | 5 | 0 | 0 |
| 2024 | 12 | 0 | 0 |
| 2023 | 8 | 0 | 0 |
| 2022 | 5 | 0 | 0 |
| 2021 | 7 | 0 | 0 |
| 2020 | 7 | 0 | 0 |
| 2019 | 4 | 0 | 0 |
| 2018 | 6 | 0 | 0 |
| 2017 | 5 | 0 | 0 |
| 2016 | 10 | 0 | 0 |
| 2015 | 8 | 0 | 0 |
| 2014 | 11 | 0 | 0 |
| 2013 | 4 | 0 | 0 |
| 2012 | 6 | 0 | 0 |
| 2011 | 1 | 0 | 0 |
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.
When in the year?
All alerts and warnings since 2011 by month.
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.
Before July 2026: the latest in the history file
| Date | Level |
|---|---|
| 21 Jan 2026 | Flood alert |
| 14 Jan 2026 | Flood alert |
| 18 Dec 2025 | Flood alert |
| 5 Dec 2025 | Flood alert |
| 24 Feb 2025 | Flood alert |
| 26 Jan 2025 | Flood alert |
| 5 Jan 2025 | Flood alert |
| 24 Nov 2024 | Flood alert |
| 14 Oct 2024 | Flood alert |
| 9 Oct 2024 | Flood alert |
| 29 Sep 2024 | Flood alert |
| 26 Sep 2024 | Flood alert |
Source: Environment Agency, Historic Flood Warnings (England); Environment Agency flood-monitoring API. Contains public sector information licensed under the Open Government Licence v3.0.