White-clawed crayfish case study - Protected Species
Client
Builders Ede Ltd.
Project period
May 2003
Project outline
The re-development of an old mill site in Gloucestershire was to cause substantial disturbance to a watercourse known to be inhabited by white-clawed crayfish. Environmental mitigation works had been agreed which involved the translocation of the crayfish to another stretch of the river on site. To maximise the chances of success, 15m of riverbank habitat enhancement works were agreed in the mitigation strategy. The Environment Agency specified that these works should not alter the size of the riverbank as this could lead to flood risks.
Services provided
Construction of a 15m un-mortared wall using reclaimed material from the site. The stone wall was left un-mortared to allow access by the crayfish. Reclaimed pipes and rubble fromt he site were placed in the backfilled soil to create nesting cavities behind the wall. The layers of the wall were tapered as they rose to reflect the sloping of the riverbank as it existed before. The final layer of stone was laid just below the surface of the river in line with the existing bank.
Photo
Un-mortared stone wall below water level to create cavities for white-clawed crayfish to inhabit
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