Case study:Highland Water at Warwickslade Lawn

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Location: 50° 51' 28.12" N, 1° 36' 31.52" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations
This is a parent project encompassing the following projects

Re-meandered section of the restored river

Project summary

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As part of a EU Life project there was a programme of habitat restoration in SSSIs, into which the Highland Water at Warwickslade fell. The project looked to return the river to it's historical course (determined through the study of historical maps), including re-meandering. A number of work measures were undertaken to reduce the speed of the flow, subsequently reducing bank erosion, and to improve the habitat quality.

Highland Water is a small headwater sub-catchment (0.25m3) of the Lymington River. Prior to restoration the channel was up to 1.2m deep and 4m wide restricting the natural seasonal flooding of the surrounding forest. The previously wet woodland and mire habitat had dried out and the increased channel size presented a barrier to freely roaming animals across the forest due to channelization in the 1850’s. Construction was carried out using an innovative tramway system to import material to the site, removing the need to drive heavy machinery across the fragile forest environment, which helped to achieve rapid visual recovery once works were complete.

A variety of morphological features and in stream habitats have re-established and floodplain connection has been restored through more regular bank overtopping, which has helped to re-wet the surrounding woodland habitats. These enhancements have been quantified by a recorded improvement in SSSI condition scores for the area.

The work has been well received by the local communities with excellent media coverage. The success of the scheme has facilitated negotiations for future works at other locations across the New Forest.

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Image gallery

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Addition of woody debris to the river to significantly reduce flow velocities, October 2009

To avoid damage to the site in construction, a minature railway track was created to transport materials and machinery. October 2009

channel after restoration

drainage channel being filled with hoggin and clay mix as flow is transferred to restored channel close by

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district South East River basin New Forest Subcatchment River name Highland Water Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 121121 m <br />0.121 km <br />12,100 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Broadleaved Woodland Waterbody ID GB107042016720 Other case studies in this subcatchment: New Forest LIFE project Site Edit site Name Highland Water WFD water body codes GB107042016720 WFD (national) typology Low, Small, Siliceous WFD water body name Highland Water Pre-project morphology Artificial channel, Over deepened, Over-widened Reference morphology Pool-riffle, Sinuous Desired post project morphology Heavily modified water body No National/international site designation UK - Site of Special Scientific Interest Local/regional site designations Special Area of Conservation, Ramsar, Special Protection Area, National Park Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate Sand River corridor land use Broadleaf/mixed woodland (semi natural), Moorland/heathland Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 3000 m3 km <br />300,000 cm <br /> Project started 2009/06/01 Works started Works completed Project completed 2009/11/01 Total cost category 1 - 10 k€ Total cost (k€) 4 k€4,000 € <br /> Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Land drainage Hydromorphology Biology Physico-chemical Other reasons for the project Bank erosion, Recreation, Landscape enhancement in a heavily protected area Measures Edit Measures Structural measures Bank/bed modifications Gravel placement, Planting Floodplain / River corridor Planform / Channel pattern Re-meandering Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://www.therrc.co.uk/case studies/highland%20water%20at%20warwickslade%20lawn.pdf River Restoration Centre Case Study http://www.therrc.co.uk/case studies/longwater%20lawn,%20new%20forest.pdf Other SSSI New Forest project - Longwater Lawn and Mallard Wood and Mead, New Forest Supplementary Information Edit Supplementary Information