The council has collated some useful information on a local flood and water information map. It contains some of the information produced by the government on the risks you face.

See the local flood and water information map

You can also see rainfall and water levels in gauges that we have installed, to provide useful indications of the risk at key hot spots. For locations see Monitoring Points.

Reducing risk to you and your community

If you are at risk, check the National Flood Forum or speak to a Floodline adviser on 0345 988 1188 to find out how to stay safe during a flood
Create a personal flood plan of what you should do and who you should contact
Residents at risk of flooding should sign up for flood warnings from the Environment Agency
Residents can help reduce their risk of flooding and the risk to others by ensuring hard surfaces are permeable and or introducing sustainable drainage
Know the drainage system within your property boundary and check that it is clear of blockages
Purchase flood protection products. The National Flood Forum (Blue Pages) is an independent directory of flood products and those offering services
Ensure that all development has an appropriate Flood Risk Assessment where needed with any planning application submitted - please see the government website for information
If your property is at risk, you can read guidance on getting the right insurance
If you've had, or are having, work done to protect your home, request a flood risk report to provide to your insurer.

What to do during a flood

Keep up to date with the weather

Use the Met Office website to keep up with issued weather warnings.

Check current flood warnings

You can also check the river and sea levels.

Call Floodline on 0345 988 1188 (24 hour service) for updates

Heavy rain may result in flooding on roads. If this occurs, we will update our social media with advice and information. Please reconsider if any journeys are actually necessary.

Protecting your home

Block doors and air vents with plastic sheets and duct tape
Store drinking water in clean containers
Turn off gas, electricity and water supplies (if you can safely)
Have a grab bag available if you need to live in a different part of the house or move into a neighbour's house
Read the Environment Agency advice to prepare for and get help during and after a flood
Purpose-designed flood protection products are much more effective than traditional sandbags. Sandbags are an ineffective solution, as water can seep through them quickly. Once used, sandbags are often contaminated and must be disposed of

Protecting yourself

Keep children, vulnerable people and pets out of floodwater
Avoid walking through flood water
Avoid driving through flood water as only a small amount can float a car
Be aware of other hazards such as fallen power lines and trees
Wash your hands thoroughly if you touch floodwater as it may be contaminated

To prevent a risk to life, please allow sufficient time to evacuate your property in advance of water surrounding the property. If you believe there is a risk to life call 999.

Who to contact when flooding occurs

Flooding can occur from a variety of sources. Roles and responsibilities and contact details of different bodies in managing flood risk can be found below.

Source of flooding	Who to contact
Rivers	All rivers are the responsibility of landowners known as 'riparian owners'. Main rivers are mapped registered by the Environment Agency. The Environment Agency undertakes some maintenance work in high risk areas. If you notice a blockage or tree on a main river which is causing risk of flooding, call the Environment Agency hotline on 0800 80 70 60. Ordinary watercourses or small ditches or rivers are the responsibility of landowners. These are mapped by the council. If a landowner wishes to pipe, alter a pipe or dam an ordinary watercourse, they should apply for consent from the council by emailing flooding@hillingdon.gov.uk or calling 01895 556000. Roadside ditches belong to the adjoining landowner and not the highway authority, except where land has been acquired for new road building. Where we own land, we have a programme for clearance and maintenance. These may all be piped or culverted, but this does not change the responsibility.
Canals	The Canal and River Trust is responsible for the canals in Hillingdon. For non-emergency related matters, call them on 0303 040 4040. For emergencies, call the 24-hour number on 0800 479 9947.
Properties	Front gardens Make sure if you're paving your garden that the material you use is permeable. The Royal Horticultural Society has produced some useful guidance on how to do this. Paving front garden guidance (PDF) [152KB] Pipes and drains A drain is the property owner's responsibility until it connects to either someone else's drain or is a public sewer. The water utility company is responsible for maintenance and repairs to: private sewers that you share with another property sections of your property's drains that lie outside the property boundary If your drains are blocked you need to call a plumber or drainage engineer, or water utility, who will charge you for clearing your drain. Specific insurance is available for drains within the property boundary. Reporting issues If you are in a council owned property and the issue is within your property you can report it online You can also use our online form to report drainage issues from another property that are affecting your home
Sewers	Sewers in Hillingdon are the responsibility of the utilities company, Thames Water. Sewer flooding can occur due to sewer bursts or an increased flow and volume of water entering a sewer system which exceeds its capacity, causing water to be pushed out. If sewer outfall points are either blocked or submerged due to high water levels, water can back up in a sewer system and cause flooding. If you think there is a blockage, use the Blockages and blocked drains \| Emergencies \| Help \| Thames Water to report it, or if your property has been flooded by a public sewer, Flooding and pollution \| Emergencies \| Help \| Thames Water call Thames Water on 0800 316 9800. Please complete their sewer flooding questionnaire and post it back to them as this is the only way they prioritise any longer term work which may be required.
Surface water	Surface water flooding occurs when heavy rainfall exceeds the capacity of the ground and local drainage networks to absorb it. It can lead to water flowing over the ground and ponding in low-lying areas. It is typically caused by short intense rainfall. This is identified as the biggest flood risk to residents in Hillingdon. Most roads have gully pots at the side of the road which captures the water, this then flows into Thames Water sewers in most cases. The council's highways teams are responsible for clearing over 36,000 gullies in Hillingdon, the highway maintenance team clear all of these on an annual basis, and in some priority areas more frequently. After heavy rain, it is expected to see some water in the road or on open land, despite work undertaken to prevent this. This is sometimes because other parts of the drainage system is blocked. However, if water is still present after a few hours and you believe the issue is being caused by a blocked or damaged gully, you can report this to us: Report a blocked or damaged gully You can use the form above to report a missing gully cover. You can also tell us about a problem with a roadside ditch. Gullies that are present in private roads are the responsibility of the land owner usually shared ownership between residents.
Groundwater	Groundwater flooding occurs because of the underground water table rising, which can result in water emerging through the ground and causing flooding in extreme circumstances. This source of flooding tends to occur after extensive periods of heavy rainfall.
Reservoirs	A reservoir is, most commonly, an enlarged natural or artificial lake, pond or impoundment created using a dam or lock to store water. There are a number of these in Hillingdon that are managed by different companies and landowners.

What to do after a flood

Information on what to do after your home has been flooded can be found on GOV.UK.

What is being done to reduce flood risk?

We are a lead local flood authority and one of a number of bodies that have a role in reducing flood risk.

View these projects on our story map

More information on all the projects on the River Pinn can be found on the Environment Agency website.

Flood risk evidence and assessments

The council has a portfolio of document providing the evidence on flood risk and setting out the actions to be taken:

Read our Local Flooding Risk Management Strategy (PDF) [1MB]
- Appendix 1 European and National Policy and Legislation
- Appendix 2 Roles and Responsibilities of Risk Management Authorities
- Appendix 3Local Flood Risk Management Strategy Objectives and Measures
- Appendix 4 Community Engagement
- Habitat Screening for appropriate assessment
- SEA Appendix 1 List of SSSI
- SEA Screening
A preliminary flood risk assessment is used to gain a high level overview on the risk of flooding and to record historic flood events in Hillingdon. You can see the Hillingdon preliminary flood risk assessment document on the government website.
We created a surface water management plan Evidence Base in 2012, and Options and Action Plan in 2013 to identify areas prone to surface water flooding, and groundwater issues. This is now superseded and replaced by the Catchment Plan which identifies revised critical drainage areas which is shortly to be published.
The west London boroughs of Brent, Barnet, Ealing, Harrow, Hillingdon and Hounslow have commissioned a Strategic Flood Risk Assessment (SFRA).
A flood risk assessment is a report which must accompany certain applications to ensure that the land or property is suitable for the proposed development. Some planning applications must be accompanied by a flood risk assessment. Please note that Sustainable Drainage Systems (SuDS) are a material planning consideration and should be considered within any development.
Flood Risk Assessment Guidance for minor householder applications (PDF) [123KB] has been developed by Hillingdon's flood team.

Flood investigations

Reports of flooding to the council are collated and recorded, and significant flooding (where properties or businesses have been flooded internally) trigger an investigation, which will be published.

The investigations that Hillingdon Council has undertaken can be found at Flood Incidents and Investigations.

It is key for the council to understand the full extent of the flooding and reporting the issues after the event is critical. Although reports will be collated from various internal departments and external organisations, if you can use the form linked below, this will ensure you provide all the relevant details needed. Photographs with timestamps are particularly useful.

Please note: The form is not to be used to request emergency help or action from the various departments within the council.

Report significant flooding

Flood assets

Under Section 21 of the Flood and Water Management Act, lead local flood authorities are required to maintain a record of all structures and features that are anticipated to have a significant effect on flood risk in the area.

Every effort has been made to ensure the accuracy of the data, but we are often reliant on third party data and we cannot guarantee it will be accurate and complete. We recommend any landowner undertake their own survey.

You can request to view the Hillingdon Council's Flood Asset register.

If you need further help and guidance, or information on Ordinary Watercourse Consents, please email flooding@hillingdon.gov.uk.

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Page last updated: 22 Oct 2024

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