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This rare chalk stream – one of around 200 worldwide – which supports important wildlife like water voles, saw more than 3,300 hours of spills in 2024.

One in six species - such as water voles and curlews - are currently at risk of vanishing from Wales, which has seen a 20% decrease on average in its wildlife over the last 30 years.

It is now hoped the success of water vole introduction in the area will lead to even more improved biodiversity along York's waterways.

England's fastest-declining mammal, the water vole, is among thousands of species set to benefit from a £25m scheme to restore "critical" habitats.

It was hoped species such as lapwing, redshank and woodcock would find a haven in the wet woodland, while otters and water voles would use the restored network of waterways as corridors and breeding habitat.