Case study:Moreton Channel Gravel Reprofiling

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Location: 50° 42' 27.12" N, 2° 16' 49.41" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	England
Main contact forename	Alasdair
Main contact surname	Maxwell
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Gravel reprofiling work in progress. Courtesy of Alasdair Maxwell - Environment Agency.

Project summary

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The whole of the Moreton channel reach, downstream of the main house had been identified for re-profiling. A survey undertaken showed cross-sections of a fairly uniform profile, which could be improved. Works created a range of profiles along the reach including new pools and riffles and overall a more varied morphology. This has in turn enabled the river to support a more diverse ecology including a more varied habitat for 0+ up to adult salmonids. The works involved the use of a long reach excavator to move existing bed material within the channel. No material was brought on to the site or removed.

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	Moreton Channel
WFD water body codes	GB108044009690
WFD (national) typology	Low, Medium, Calcareous
WFD water body name	Frome Dorset (Lower) & Furzebrook Stream
Pre-project morphology	Very little geomorphological diversity or in channel features.
Reference morphology	Increased channel complexity, supporting greater ecological diversity.
Desired post project morphology
Heavily modified water body	No
National/international site designation
Local/regional site designations
Protected species present	No
Invasive species present	No
Species of interest	Brown trout, salmon, grayling, bullhead, minnow, brook-lamprey & stoneloach
Dominant hydrology
Dominant substrate
River corridor land use	Rural - mixed land use.
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

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Reach length directly affected (m)	500500 m <br />0.5 km <br />50,000 cm <br />
Project started
Works started	2010/09/01
Works completed	2010/09/05
Project completed
Total cost category	1 - 10 k€
Total cost (k€)	72007,200 k€ <br />7,200,000 € <br />
Benefit to cost ratio
Funding sources	Environment Agency and Frome, Piddle and West Dorset Fishery Association

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	WFD assessment determined 'poor' ecological status for waterbody. Channel restoration measure to increase morphological complexity and habitat diversity.
Hydromorphology
Biology	Fish, Macrophytes
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Reprofiling of channel bed to create more diverse habitat for aquatic organisms - eg. habitat suitable for fish throughout their lifecycle (spawning to adult). Some LWD dams placed to further improve habitat diversity - deep pools, exposed gravel berms and bankside gravel pinch points.
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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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
Fish	Yes	Yes	No	Yes	No	Improvement
Macrophytes	Yes	Yes	No	Yes	No	Improvement

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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Monitoring documents

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Image gallery

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Additional links and references

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Link	Description

Supplementary Information

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