What has been announced?
A flood retention basin is planned on the site of the former Carimaï hamlet, between Cannes and Le Cannet. It is a flood-management structure on the Frayère, not a swimming pool or a residential development.
The project was presented on 25 September 2026. Cannes Lérins issued its press release on 29 September, followed by the City of Cannes announcement on 30 September. Its stated storage capacity is around 70,000 m³.
What is it intended to do, and what are its limits?
The structure is designed to hold back part of the water during a flood and release it gradually afterwards. The aim is to slow the Frayère flood surge and allow more time for warnings and protective measures downstream.
This is a project within the Frayère catchment, not confirmation of protection throughout Cannes and Le Cannet. Cannes Lérins’ risk information distinguishes river flooding from surface-water runoff after heavy rain. Runoff can also occur outside areas regulated by the flood-risk prevention plan.
The commission’s conclusions dated 10 September 2026 identify a specific limit: for a flood comparable to 3 October 2015, the structure would no longer provide significant flood attenuation, although it should allow more time for evacuation. The commission leaves the environmental authorisation decision to the prefect; its conclusions are not the authorisation itself.
When should work begin?
The September announcement schedules a start in October 2026 subject to environmental authorisations, with completion targeted for late 2028. This is a provisional timetable.
The official consultation notice concerns an application for environmental authorisation, with the decision resting with the prefect. Holding the consultation does not establish that permission has been granted.
As checked on 2 October 2026, the accessible documents do not confirm final authorisation or the actual start of works. We therefore do not describe construction as already underway or the completion date as guaranteed.
What does this mean when choosing a house or plot?
The announcement is a reason to clarify local flood exposure, not to drop property checks. The address, terrain, routes by which water could enter and previous damage remain relevant. Being close to the future basin does not establish that a particular plot will be protected.
If a seller cites Carimaï as evidence that a home is safe, ask for a document connecting the project’s expected effect to that address. Compare it with current risk information and an appropriate specialist’s assessment.
What should you check for your address?
The next step is to gather the risk disclosure, records of flooding and repairs, insurance information and questions for the inspection. Our villa and land checks guide explains what to request and who can help resolve discrepancies before you decide to buy.