Tank Crossing A, Upavon, Wiltshire September 2017 Wiltshire Wildlife Trust

FiveRivers were contracted by Wiltshire Wildlife Trust to deliver a multi-benefits project including the reinstatement of a palaeochannel on the River Avon.

The project incorporated the lowering of the floodplain and the installation of a variety of wetland features. The overarching goal was to enhance the water quality of the River Avon and enhance habitats. Given a wide design brief, we tailored the works to achieve the best possible environmental improvements.

Project requirements

Tasks

  • Construction of a new river channel
  • Connection with existing channel
  • Creation of two new wetland features
  • Lowering of the floodplain for additional capacity
  • Importing gravels to the new river channel
  • Installation of large woody material in the channel
  • Reinstatement of turfs to promote colonisation and increase vegetation cover
  • Improvement of habitats for key species such as Water vole, Atlantic salmon, Brown Trout and Desmoulin’s whorl snail.
  • Design variations to improve water quality
  • Use of site won materials

 

Our approach

Key remarks

  • Five Rivers were commissioned by the Wiltshire Wildlife Trust to carry out river restoration and habitat enhancement works on the River Avon.
  • The work was carried out on MOD land so permissions and daily communications were vital.
  • Multi skilled site team carried out a variety of works including water vole searches, excavations, tree works, pinning large woody material and installing imported gravels in a safe and efficient manner.
  • The restoration project sought to reinstate natural form and flow function by utilising site won materials such as gravels and timber.
  • Restoration works were undertaken in order to restore flow velocity, enhance channel dynamics, and thus in-channel plant communities, invertebrate numbers and fish habitat

 

Project outcomes

Effects

  • Paleochannel reinstated
  • Improved water quality
  • Increased wetland habitats
  • Floodplain reconnected to the river
  • Increased variety of in-channel habitats

Contact us

Looking to talk to an expert?

James Peake

Director of Habitats

Get in touch by either phone or email to speak with James and discuss your needs.