Rivers, canals and reservoirs
Rivers
All rivers are the responsibility of landowners known as riparian owners.
The Environment Agency maps main river and coastal maintenance work in high-risk areas. If you see a blockage or tree causing flood risks, call 0800 807 060.
Ordinary watercourses, such as small ditches and rivers, are managed by landowners to maintain, helping to prevent flooding and ensure proper drainage. Local councils map these watercourses to support planning and flood risk management.
Access our flood and water risk map
If a landowner plans to pipe, alter a pipe, or dam an ordinary watercourse, they need to apply for council consent by emailing flooding@hillingdon.gov.uk or calling 01895 556000.
The council doesn't own roadside ditches, they belong to the adjoining landowner unless used for new roads.
Canals
The Canal and River Trust is responsible for the canals in Hillingdon.
For non-emergency related matters, call them on 030 3040 4040.
For emergencies, call the 24-hour number on 080 0479 9947.
Reservoirs
Hillingdon has several reservoirs, managed by different companies and landowners. Typically, a reservoir is a large natural or artificial lake, pond, or impoundment created with a dam or lock to store water.