The Bishop of St Albans received the following written answer on 7th February 2025:
The Lord Bishop of St Albans asked His Majesty’s Government what assessment they have made of the impact of the introduction of a pair of beavers to the River Glaven in Norfolk in 2022 on (1) water pollution, and (2) flood risk.
Baroness Hayman of Ullock (Lab, DEFRA): In 2021 Natural England issued a licence to the Norfolk Rivers Trust for a fenced beaver enclosure in the upper Glaven catchment. The application was supported by the University of East Anglia, including pre-release ecological, hydrological & social science reports, and proposals to monitor impacts after release. Natural England staff have visited the site on a number of occasions, and observed a series of extensive dams retaining water and sediment in the wooded enclosure. Natural England is also aware of the project’s recent research publication(opens in a new tab), demonstrating that the beaver wetlands significantly reduced nitrate and phosphate levels in the chalk stream flowing out of the site.

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