Case study:Moreton Channel Gravel Reprofiling

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Location: 50° 42' 27", -2° 16' 49"
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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

Case_study:River Frome Rehabilitation Plan

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. 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 debris dams installed, gravel berms and bankside gravel pinch points.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district South West
River basin Dorset

Subcatchment

River name Frome Dorset (Lower) & Furzebrook Stream
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 223
223 m
0.223 km
22,300 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB108044009690



Other case studies in this subcatchment: 2e Lower Woodsford River and Floodplain Enhancement, Bockhampton Enhancement, Hurst Bridge (downstream), Louds Mill (Downstream)m Enhancement, Lower Bockhampton, Lower Woodsford, Martins River Island, North Channel Upper Reach, River Frome Rehabilitation Plan, Unit 1b - Long Bridge to Downstream of Louds Mill... further results


Site

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

Reach length directly affected (m) 500
500 m
0.5 km
50,000 cm
Project started
Works started 2010/09/01
Works completed 2010/09/05
Project completed
Total cost category 1 - 10 k€
Total cost (k€) 7.2
7.2 k€
7,200 €
Benefit to cost ratio
Funding sources Environment Agency, 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

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

Structural measures
Bank/bed modifications Bed reprofiling, Habitat diversification, Large woody derbis dams, Creation of pools, Gravel berms
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological 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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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