2023-24 Tales from an East Anglian Riverbank - Portfolio - Page 19
GRANTA BARRIERS
CHALK TO SEA
Working with:
BCN Wildlife Trust
Cambridge Water
EA Lead:
Rob Clapham
The River Granta is a heavily modi昀椀ed
chalk stream river south of
Cambridge. The river has a wide
range of pressures impac}ng its
ecological poten}al. One of these is
the presence of now obsolete
structures which act to impound the
river, causing degrada}on of habitats
and preven}ng 昀椀sh passage.
Lower weir before Credit: BCN Wildlife Trust
Top weir before Credit: BCN Wildlife Trust
Lower weir aver Credit: BCN Wildlife Trust
Top weir upstream before Credit: BCN Wildlife Trust
Lower weir aver (summer) Credit: BCN Wildlife Trust
Top weir upstream aver Credit: BCN Wildlife Trust
The Granta project, delivered by BCN
Wildlife Trust, successfully removed 2
of these structures and undertook
habitat improvement works. These
will help improve the local ecology
and provide addi}onal resilience to
low now pressures in the area.
Outputs:
£26,100
Total Project Value
Removal of 2 redundant weirs
Increased in-channel
£20,000
£6,100
EA Funding
Partnership Funding
hydromorphological diversity over
800 metres
Crea}on of noodplain scrapes
Outcomes:
Improved 昀椀sh passage
Improved sediment management
Improved ecological diversity
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