Our Rock Products are the (Jack’s) Key to Preventing Erosion

Jack Keys laying Rock Mattresses in river bed for erosion control

Jack Keys laying Rock Mattresses in river bed

Preventing erosion in a new river channel on a sensitive site

The Environment Agency have decommissioned two reservoir dams at Jack’s Key and created an engineered channel between them that feeds into the River Darwen.

The channel is spilt into 3 sections. The middle section was being heavily scoured by winter flows, which was a concern as further downstream there was a sensitive flood risk situation.

The Environment Agency asked Salix for an alternative to Reno mattresses that would be robust, easier to green up and environmentally sensitive. They required a long term solution to prevent erosion but also create opportunities for wildlife

Spider machine lifting pre-filled Rock Mattresses into place Pre-filled Rock Mattresses to prevent scour in river bedAerial shot of the upper site lined with Reno mattressesLooking upstream showing the change to the new channel lining option of pre-filled Rock Mattress encasing much smaller stone.Pre-filled Rock Mattresses to prevent scour in river bedRock Mattresses through bed of channel and along the sides blending in well shortly after installationResult is a new channel that functioned immediately going into the winter. It has been unaffected by many high flow events and retained its habitat value.
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Result is a new channel that functioned immediately going into the winter. It has been unaffected by many high flow events and retained its habitat value.

Our pre-filled Rock Rolls and Rock Mattresses were used in the river bed, these have been shown to be highly effective in the most testing of environments whilst also providing opportunities for invertebrates and other wildlife.

Lindsay Ward from the Environment Agency said

Salix were very helpful from our initial enquiry through to the construction works. From a quick phone discussion and emailing some photos through we received some very good design options and sketches within a couple of days. Following a site meeting we confirmed our preferred option and received a quote very quickly afterwards.

Salix were easy to deal with and met our tight timescales throughout. The works were carried out safely and effectively on site, to programme, working well with our principal contractor. Their advice and design was very good and the constructed Rock Rolls are performing well on site.

Ian Bolt of VBA said

The 2  Salix representatives we had at Jacks Key were Rhodri Henry & Jason Alford. They were both a credit to Salix, worked meticulously in difficult conditions and nothing was too much trouble. Any issues were addressed immediately with a minimum of fuss.

Thanks Guys.

Details

Name: Preventing scour and protecting habitats on the River Darwen
Client: Environment Agency
Location: River Darwen
Category: SUDS & Drainage Channels

Case Study

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