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	Nick
Main contact surname	Elbourne
Main contact user ID	User:NickRRC
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations	Forestry Comission, 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

Project picture

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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Catchment

River basin district	South East
River basin	New Forest

Subcatchment

River name	Black Water
Area category	10 - 100 km²
Area (km2)
Maximum altitude category	100 - 200 m
Maximum altitude (m)	119119 m <br />0.119 km <br />11,900 cm <br />
Dominant geology	Siliceous
Ecoregion	Great Britain
Dominant land cover	Broadleaved Woodland
Waterbody ID	GB107042016710

Site

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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

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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

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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

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Structural measures
Bank/bed modifications	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.
Floodplain / River corridor	See above - increased channel:floodplain connectivity.
Planform / Channel pattern	Re-meandering of channel to increase capacity.
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

Monitoring

Hydromorphological quality elements

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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

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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

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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

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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

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Image gallery

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The old course of the stream

Additional documents and videos

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Additional links and references

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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

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