Case study:Diversion of the River Nith
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- 1 Project overview
- 2 Image gallery
- 3 Catchment and subcatchment
- 4 Site
- 5 Project background
- 6 Reasons for river restoration
- 7 Measures
- 8 Monitoring
- 9 Additional documents and videos
- 10 Additional links and references
- 11 Supplementary Information
|Project web site|
|Themes||Economic aspects, Habitat and biodiversity|
|Main contact forename||Charles|
|Main contact surname||Perfect|
|Main contact user ID|
|Contact organisation||Centre for River EcoSystem Science|
|Contact organisation web site|
|Partner organisations||East Ayrshire Council, SEPA, Scottish Natural Heritage, RSPB, Nith Salmon Fisheries Board, New Cumnock Angling Association, Halcrow, River Restoration Centre|
|Parent multi-site project|
| This is a parent project
encompassing the following
PHASE 1: 2000 - Temporary diversion of the Nith to the north west of its current floodplain to allow for coal extraction by Scottish Coal.
The Nith is an important salmon and trout fishery, however overgrazing, agriculture and past open-cast mining along the reach have affected invertebrate populations and fish spawning grounds.
The primary restoration criteria for the 2000 restoration were:
- design which would convey a 1 in 50 year flood.
- channel which would not dry up during low flow.
- design mimicing pre-diversion channel - ie. similar meander loops, pool-riffle-run sequences and channel profiles.
- design which would create opportunities for enhancement of biodiversity (over and above pre-diversion conditions).
Work commenced in April 2000 and was completed during September of the same year.
PHASE 2: During 2004, the former course was enhanced and reconnected to the rest of the river and the temporary channel cut off to allow mining to progress across the floodplain. The site was subject to significant post-restoration biological monitoring as part of a PhD programme through CRESS (Centre for River Ecosystem Science - University of Stirling) - to ensure the new channel was performing well, ecologically.
2000: channel bed/ground layer consisted of existing substrate with clay lining. 2004: Geotextile reinforcement of banks, to reduce bank erosion. Clay mattress lining to prevent water percolating through unconsolidated substrate and flowing as groundwater through potentially contaminated mine tailings. Gravel added to bed to create habitat diversity for invertebrates and fish. 2000: Containment bund constructed to prevent flooding of mine workings.
Monitoring surveys and results
Catchment and subcatchment
Select a catchment/subcatchment
Cost for project phases
Supplementary funding information
Phase 1: 3900000 (thousands of euros)
Reasons for river restoration
Hydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
Additional documents and videos