New Forest Catchment Partnership

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Case study: Lymington

Restoring Passford Water in Lymington

A piece of waste land (below) with a history of fly-tipping and contamination from the engineering works next door which hosted a covered-up stream running through a 200-metre culvert.f

The stream channel design was tricky. The walls needed to allow enough depth and capacity to carry flood water at times of heavy rainfall. This was done by inserting sheet piles – sections of steel sheets with interlocking edges – below the water table and sealing the gaps so no residual soil contamination could reach the new channel.

To encourage the vegetation we’d planted to help stabilise the walls, we clad the sheet pile with metal gabion baskets and graded the banks to a more natural slope.  The stream was designed with riffles and pools to improve the natural habitat.

The transformation from a piece of bare tarmac to a beautiful stream has been amazing (top picture). It will take some time to settle in, and for new habitats to be created, but the potential is there for everyone to see as they walk along the footpath next to the industrial site.

Read the full story on the Environment Agency blog.

  1. River catchment project
  2. About New Forest rivers and streams
  3. Helping our rivers and streams
  4. About New Forest Ponds
  5. Water Quality – phosphates
  6. Case study: Lymington (you are here)
  7. Case study: triops
  8. Contact us

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