Bossington Test reborn, Feature 1

‘House Beat’ – R/H branch

Please use the following links below to discover more about the Bossington Test reborn project.

  1. ‘House beat’ – R/H branch (Bossington mill race d/s to Wallop brook confluence)
  2. ‘House beat’ L/H branch – (Upper reach to top boundary)
  3. Gravel extraction site
  4. ‘House beat’ L/H branch (bottom reach to confluence)
  5. Pipe bridge crossing – Upper ‘House Beat’
  6. ‘House beat’ Central
  7. ‘Home beat’ U/S Weir pool & Fishing hut
  8. Double ‘Home Beat’ weir structures
  9. ‘Home beat’ D/S Weir pool & Riffle
  10. Nursery side stream
  11. ‘Home beat’ to Bailey bridge
  12. Ecological monitoring
  13. Native planting of margins and in-stream macrophytes

Before weir removal – Restorative work on this right-hand branch of the project site was shelved due to vehicular access restrictions relating to the SSSI status of the adjacent island. Nevertheless, it still provides a useful ‘Control’ site to monitor the extent to which channels ‘self-heal’ following impoundment removal. This will make for interesting comparison during the annual review.

Photo 1

Photo 2

Photos 1 & 2 – The above ‘before’ images show House beat Mill race channel prior to the Home beat weir removal and illustrate the upstream extent (4oom) to which backed-up flows from the weir installation resulted in the accumulation of heavy sediment deposits on the river bed. The L/H image shows backed-up water levels to the base of bankside vegetation.

After weir removal –Water levels dropped by ca. 400mm as flow velocities and scour increased.

Photo 3

Photo 4

Photos 3 & 4 -The exposed bank below the grass line shows the original height of backed-up water levels. Increased flow velocity has scoured a new flow path in the friable sediment to the left of both images. The extent of ‘non-intervention’ natural recovery will be the first point of discussion at the start of the 1st year anniversary site visit in mid-October 2018.

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