Case study:New Forest LIFE project

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Location: 50° 52' 20.52" N, 1° 37' 32.71" W

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Project overview

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Status	Complete
Project web site	http://www.newforestlife.org.uk/
Themes	Flood risk management, Habitat and biodiversity, Land use management - forestry, Monitoring
Country	England
Main contact forename	Sarah
Main contact surname	Oakley
Main contact user ID
Contact organisation	Forestry Commission
Contact organisation web site	http://www.forestry.gov.uk/
Partner organisations	Environment Agency, University of Southampton
This is a parent project encompassing the following projects	Highland Water at Warwickslade Lawn, Holmsley Inclosure Stream Restoration, Markway Stream Restoration

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Project summary

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In the past, the Highland Water and Blackwater channels have been straightened and cleared of large woody debris (LWD), leading to disconnection of the channel from its floodplain, increased headward erosion and downcutting, high sediment transport rates and rapid progression of flood peaks.

The New Forest LIFE III project was proposed to improve the ecological potential of the catchments, increase habitat diversity and mitigate flood risk. Restoration began in 2003, with a 'test restoration' on the Blackwater, followed by Highland Water, reaching completion in 2006. The project involved remeandering of the channel and the introduction of LWD dams and CWD - providing habitats for fish and macroinvertebrates, while increasing flow resistance and the frequency/magnitude of overbank flow (which in turn would supply additional LWD for dam creation. LWD dams also increase the frequency of pool-riffle sequences - improving bed complexity.

Many aspects of the projects were deemed to be a success, with a clear increase in delay of the flood peak, post-restoration. The frequency and duration of overbank flow was also observed to increase appreciably.

Works included: Introduction of LWD to increase flow resistance - increasing frequency/magnitude of overbank flow, delaying flood peaks for flood mitigation and creating habitat for aquatic organisms. Bed-level raising with gravel addition.

Monitoring surveys and results

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Image gallery

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The old course of the stream

Restored channel with large wood incorporated, Blackwater

Meander development on the Blackwater

New restored channel on the Blackwater

Fallen trees left in place to increase diversity, Blackwater

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: Highland Water at Warwickslade Lawn Site Edit site Name Highland Water/Blackwater WFD water body codes GB107042016720 WFD (national) typology Low, Small, Siliceous WFD water body name Highland Water Pre-project morphology Straight Reference morphology Sinuous, Pool-riffle Desired post project morphology Heavily modified water body Yes National/international site designation EU - Special Area of Conservation Local/regional site designations SSSI (Site of Special Scientific Interest) Protected species present No Invasive species present No Species of interest Dominant hydrology Quick run-off Dominant substrate Barton clays and plateau gravels. River corridor land use Plantation forestry, Woodland Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient 0.0066 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 2003/06/01 Works started 2005/06/01 Works completed 2006/08/01 Project completed Total cost category more than 10000 k€ Total cost (k€) Benefit to cost ratio Funding sources EU LIFE III 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 Flood mitigation Hydromorphology Width & depth variation, Flow velocities, Increase sinuosity. Biology Improve channel:floodplain connectivity, to increase wetting and provide further habitat opportunities. Physico-chemical Other reasons for the project Bank erosion, Landscape enhancement Measures Edit Measures Structural measures Bank/bed modifications Introducing large woody debris, Habitat restoration, Bed raising, Gravel augmentation Floodplain / River corridor Floodplain reconnection, Floodplain spillways 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 Width & depth variation Yes Yes Yes No No Improvement Flow velocities Yes Yes Yes No No Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish Yes Yes No Yes Yes Inconclusive 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 Frequency of overbank flow Yes Yes No Yes No Improvement Lag in propagation of flood peak Yes Yes No Yes No Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://www.newforestlife.org.uk/life3/PDFs/PDFs/LaymansReport.pdf Layman's Report http://www.newforestlife.org.uk/life3/PDFs/PDFs/C-V2EndofProjectHydroRpt.pdf Hydrological Report http://www.geog.soton.ac.uk/school/staff/profiles/das/Life.pdf New Forest LIFE III Monitoring Report http://www.natura.org/DOC/uk newforest panels.pdf Sustainable Wetland Creation in the New Forest http://www.coastms.co.uk/resources/6a99ddc3-5955-4605-9f30-76f182f80153.pdf Presentation: Practice and impacts of wet woodland restoration in lowland headwater streams in the New Forest SAC. Supplementary Information Edit Supplementary Information