Embedded Files
Revitalising the River Ver
Revitalising the River Ver
by Claire Robinson, Committee member
The River Ver is a chalk stream, a globally rare habitat and one of only 260 in the world - and nine times rarer than a giant panda. England is home to 85% of them and the Ver is one of several flowing across Hertfordshire.
The project, Revitalising the River Ver, is led by the Environment Agency in association with St Albans District Council to restore this precious habitat and increase biodiversity.
What makes chalk rivers so special?
Unlike most rivers which obtain their water from surface run-off, creating a muddy and cloudy appearance, chalk rivers are fed by springs from an underground chalk aquifer. This supplies crystal-clear, mineral-rich water at a constant temperature creating a habitat rich in wildlife. Chalk rivers are known as the ‘rainforests’ of England
However, historical modifications, including re-routing the river off its natural course, have left it too wide, too straight and with a bed of silt, rather than a natural bed of gravel.
The Revitalisation Work 2025
The Revitalisation Work 2025
Bell Meadow
Near St Michael’s entrance to the park, the land was frequently flooded as the river tried to return to its natural course. A wetland meadow habitat has been created to support wildlife, while the public can safely access the area via a bridge.
River alongside the lake
River alongside the lake
Much of the Ver was heavily shaded. To support a rich wildlife, chalk rivers need 70% light and 30% dappled shade. So trees were cut back, letting the sunlight in
River opposite Westminster Lodge
The Ver had become too straight with a sluggish flow of water. So tons of gravel have been used to create shallow areas (riffles) to speed up the flow of water and oxygenate it. Brown trout have already been seen laying eggs in the gravel.
Gravel has also been used to build shelves (berms) at the side of the river. This narrows the channel creating a meandering and faster flow which removes silt.
In the stretch alongside the river, the Ver Valley Society planted around 2,000 bulbs, including wild garlic, wild daffodil, native bluebells, snowdrops and snake’s head fritillary.
Seasonal wetland
This area, opposite the running track, is part of the river’s natural flood plain. It has now been transformed into a scrape – a shallow and seasonal wetland – to create a more diverse habitat. Alder, willow and birch trees have been planted and wild flower seeds will be sown.
Organisations working on the rivers
The government’s main environmental regulator. The EA manages flood risks, air/water quality, fisheries, waste and pollution control and is responsible for the main works in Verulamium Park.
Herts and Middlesex Wildlife Trust
HMWT, which is based in Verulamium Park, runs the Living Rivers project, managing the conservation of chalk streams across the county. Its work includes restoring natural features, reducing shade and erosion, and removing invasive species such as Himalayan balsam and mink. The Trust’s work has brought otters back into Hertfordshire; in addition, over 600 water voles – our most threatened mammal - have been released into the rivers. In 2025 they were spotted in Verulamium Park.
The Ver Valley Society exists to protect and promote all aspects of the River Ver and its valley. It campaigns to reduce water abstraction, runs work parties to improve the habitat and monitors the health of the river.
Page updated
Google Sites
Report abuse