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Caerphilly Council will have to spend nearly £3 million on “long-term” defences to protect eroding river banks in Ystrad Mynach.

The Nant Cylla watercourse flows “rapidly” through the town, causing scouring and erosion to the banks.

A series of “temporary measures” have failed to prevent further wear and tear, and the council is now faced with a hefty bill to restore the banks and protect them for the next 100 years.

The council has the legal obligation to maintain some stretches of the banks, while others are under private control.

Nigel George, the cabinet member for corporate services, told colleagues at a meeting on Wednesday February 21 the river could be protected by reducing the rate of water flow and “lessen the likelihood of and impact of scour”.

Scouring refers to the removal of sediment from around a structure, which can weaken and pose risks to river banks and bridges.

The council is likely to work with landowners along the affected stretch of the Nant Cylla, noting that a “single scheme that addresses the entire stretch of the watercourse would result in better and more sustainable outcomes”.

Failing to provide the same level of protection along the whole stretch could mean current problems will be “exacerbated”, Mark Goodger, a council principal engineer, told the meeting.

But some outbuildings along the banks could be demolished if they were built without planning permission, because they may be “further weakening the banks” and are “liable to collapse”.

The money for the project will come from uncommitted capital earmarked reserves.

Meanwhile, Caerphilly Council is consulting the public on plans for a new flood risk management strategy for the county borough.

Hefin David, the Senedd member for Caerphilly, has urged residents to have their say.

He said: “If any residents have any comments or feedback in relation to the draft strategy, I would encourage them to have their say by submitting comments to the consultation. This has been a big issue locally for some time, so I would expect there to be many people wanting to get involved.”