]> 2026-04-11T18:59:45+00:00 Case study:River Witham Great Ponton 500 en Easton Case Study v2 Final 220415 opt.pdf Project Case Study Draft Tree Hinging Faggot Mattresses Flow Deflectors Weir Bypass new meandering channel planform Environment Agency Wild Trout Trust and Grantham Angling Association Fly Fishing Section Great Britain EA Yes No Yes false Ponton 2.png Ponton 3.png Ponton 4.png Ponton 5.png Ponton 6.png No The importance of gravel and floodplain connectivity to drive significant change. Need for wood in by-pass channel. Where the constraints have been addressed by realigning and re-naturalising the channel at Grange Farm, habitat improvement has been more successful, although further intervention is required. Introduced gravel has been displaced in high flows and needs to be replaced with larger calibre material which will remain stable and restore the designed pool-riffle sequence. The abrupt change in valley floor gradient at this site constrained the design of the new channel and caused this situation; this is unusual and should not be a deterrent to similar river restoration schemes elsewhere. 52.858996552416,-0.61795271230623 Matt Environment Agency Parr Tree Hinging, Faggot Mattresses, Flow Deflectors,Fencing, cattle access points,Weir Bypass, new meandering channel planform ,,, For all phases, visual inspections and regular fixed-point photographs are being undertaken to monitor the integrity and performance of the enhancement works and record any changes they are making to river morphology. Specific to Phase 2, modifications to the channel profile as a result of the woody material introduction upstream of Dunkirk Cottage can be determined by comparison with a baseline cross-section in this location and the effects on turbidity and invertebrate populations will also be monitored here. For phase 3, in addition to an annual redd (trout spawning “nest”) survey of the new riffles, the established annual fish monitoring downstream of Easton Walled Garden and invertebrate sampling at Easton Lane Bridge will be used to detect any changes as a result of the works. 27046 Wild Trout Trust and Grantham Angling Association Fly Fishing Section By-pass channel under construction. Ponton 1.png 2013-01-02Z 2456294.5 Complete Channel narrowing and flow deflection to create flow variation and beneficial bed scour using a variety of techniques: log flow deflectors (vanes), open and enclosed log/faggot and brushwood mattresses (silt-traps); increasing in-stream woody habitat by securing existing deadwood and hinging and pinning (layering) live riverside trees; creation of sections of 2-stage channel and enhancing marginal wetland habitat by excavating of bays/berms; and the reduction of sediment inputs by ford refurbishment and riverside fencing. The final phase involved major works to restore a section of the river to a more natural planform. Project Objectives The initial downstream phases were primarily designed to Stabilise eroding river banks to reduce sediment inputs caused by fluvial processes and livestock. Trap mobile fine sediments already in the river. Improve conveyance during higher flows and reduce flood risk. Improve in-stream habitats for fish and invertebrates, including white-clawed crayfish. The final phase, at Grange Farm, set out to restore a degraded section of the river to its original course, such that the naturalised section of river would function in an ecologically and geomorphologically improved form. River Witham Great Ponton river witham great ponton No 2.7 Witham Anglian Fencing cattle access points Upper Witham upper witham River Witham Great Ponton river witham great ponton 10 - 100 km² 46 Less than 100 m Upper Witham GB105030056760 Habitat and biodiversity 141 GB105030051570 Upper Witham Headwater to confluence Cringle Brook 2024-02-08T13:34:00Z 2460349.0652778 2024-02-27T12:05:36Z 2460368.0038889 River Witham Great Ponton 500 1 plainlist 5 [[Category:Case study]] [[Project title::!River Witham Great Ponton]] [[Subcatchment title::Upper Witham]] River Witham Great Ponton# QUERY7e91575ae38c98994de277471f81f941