]> 2026-04-12T15:41:17+00:00 Case study:River Wandle: Butter Hill Phase 3 500 en Approved Introduction of gravel Introducing large woody debris Regrading Habitat restoration Restoration of natural vegetation Tree removal Weir lowering Enhancing flow diversity Improving fish migration Channel narrowing Meandering channel Wandle Trust Environment Agency Defra Thames Water National Lottery's Heritage Lottery Fund Yes No Yes false No 51.370370764555,-0.1599336694926 Tim Wandle Trust Longstaff Introduction of gravel, Introducing large woody debris, Regrading, Habitat restoration, Restoration of natural vegetation, Tree removal, Weir lowering,,,Enhancing flow diversity, Improving fish migration, Channel narrowing, Meandering channel, ,,Volunteer engagement,, Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases. 22109 Environment Agency, Defra, Thames Water, National Lottery's Heritage Lottery Fund Before & After Butter Hill Phase 3 Works © Wandle Trust 2012-01-01Z 2455927.5 Butter Hill Phase 3.png 2010-01-01Z 2455197.5 Complete This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project "River Wandle Restoration Project". Flood risk and hydraulic assessment of the weir and fish pass were carried out in conjunction with Matt Horritt Consulting. Works were delivered with the help of appointed contractors Aquamaintain Ltd under the supervision of South East Rivers Trust staff.   The weir at Butter Hill bridge was partially lowered to restore natural flow to the upstream channel and the fish pass modified to improve its efficiency. Upstream of the weir the over-straight, over-wide channel was narrowed and modified to create a meandering sequence using a combination of gravel, hazel faggots, chestnut posts and coir geotextile with silt from the channel and brash as backfill.   The banks on both sides of the channel were then re-graded to create marginal and transitional habitats. A variety of marginal plant species were introduced to assist with naturalisation by a team of 15 volunteers. Downstream, for 300 m, channel narrowing and meandering was continued and gravel and Large Woody Debris was introduced along the whole reach to further diversify the river flow and replicate natural hydromorphological processes, creating habitats for invertebrates and all life stages of fish. Trees were also removed in phases over a two year period to increase light in selected places and encourage plant growth along the whole 500 m reach. River Wandle: Butter Hill Phase 3 river wandle: butter hill phase 3 No Wandle, Butter Hill wandle, butter hill Volunteer engagement Wandle Fisheries Habitat and biodiversity Social benefits Urban 2016-02-09T14:36:01Z 2457428.1083449 2019-01-02T16:43:15Z 2458486.1967014 River Wandle: Butter Hill Phase 3 500 1 plainlist 5 [[Category:Case study]] [[Project title::!River Wandle: Butter Hill Phase 3]] [[Subcatchment title::Wandle]] River Wandle: Butter Hill Phase 3# QUERY960dd631310500a009c4a3e0303fa705