Case study:Langford Lakes project

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Location: 51° 8' 10.69" N, 1° 57' 11.05" W

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Project overview

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Status	Complete
Project web site	http://www.therrc.co.uk/rrc_case_studies1.php?csid=30
Themes	Economic aspects, Flood risk management, Land use management - agriculture, Social benefits, Spatial planning
Country	England
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID	User:NickRRC
Contact organisation
Contact organisation web site
Partner organisations	Wiltshire Wildlife Trust, English Nature, Enviroment Agency and Wild Trout Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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This area comprises a series of large lakes with the River Wylye, a chalk stream, flowing through the centre of them. Langford lakes and the River Wylye are renowned for their popularity for angling but fish populations have declined over recent years. This has resulted in a partnership being formed between the Wiltshire Wildlife Trust, English Nature, the Environment Agency and the Wild Trout Trust to address this issue.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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Name	Steeple Langford
WFD water body codes	GB108043022550
WFD (national) typology	Low, Medium, Calcareous
WFD water body name	Wylye (Middle)
Pre-project morphology	Single channel, Straight, High width:depth
Reference morphology	Sinuous, Pool-riffle
Desired post project morphology
Heavily modified water body	No
National/international site designation	EU - Special Area of Conservation
Local/regional site designations
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology	Quick run-off, Groundwater
Dominant substrate	Bedrock, Cobble, Gravel
River corridor land use	Extensive agriculture, Woodland
Average bankfull channel width category	5 - 10 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)	0.30.3 m³/s <br />300 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	1000 m1 km <br />100,000 cm <br />
Project started	2002/10/01
Works started
Works completed	2002/10/01
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources	Wiltshire wildlife trust, Natural England, Environment Agency

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
Hydromorphology	Quantity & dynamics of flow, Connection to groundwaters, Continuity of sediment transport, Continuity for organisms
Biology	Fish: Disturbance-sensitive species, Invertebrates: Disturbance-sensitive species
Physico-chemical	Nutrient concentrations
Other reasons for the project	Flood risk management

Measures

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Structural measures
Bank/bed modifications	Planting, creation of a V weir, techniques to trap unwanted sediments - promoting eco. and geomorph. diversity.
Floodplain / River corridor
Planform / Channel pattern
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

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

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

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description
http://publications.environment-agency.gov.uk/pdf/GESW0910BSTR-E-E.pdf	WFD Status for Wylye - See P. 1355.

Supplementary Information

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RRC Visit Notes (2009):

Most of the examples of techniques in this river have only just been put into place (the official opening of the site was 28th September 2002). It is therefore, too early to establish which are likely to provide answers in terms of best practice and whether the increase in channel diversity will have a long term benefit for fisheries objectives.

Some concerns were raised during the site visit about the use of the v weir in this particular situation and it remains to be seen how successful/sustainable this will be compared to the more ‘natural’ diversity initiatives using on site materials over the longer term.

The faggots and pegs appear already to have trapped some sediment behind them. They are, however, very experimental and their height, in this case (approx 40-50cm), may ultimately be most critical to their long term success. Nevertheless they may provide a possible alternative to places where toe boarding or similar structural support has been used along other rivers.

This is an excellent site for viewing and discussing a range of techniques, and evaluating their effectiveness and suitability along chalk streams and elsewhere.