Case study:Rother meander reconnection

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Location: 50° 57' 46.30" N, 0° 36' 15.73" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Monitoring
Country	England
Main contact forename	Damon
Main contact surname	Block
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	River Restoration Centre
Parent multi-site project
This is a parent project encompassing the following projects	No

Restored channel shortly after works

Project summary

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Shopham Loop is a section of the river Rother, West Sussex between Coultershaw Bridge and Shopham Bridge. A cut was created in the 18th century to bypass the meander and enable passage of boats upstream. However after navigation ceased, the locks were removed and the cut became the main river course with the meander (Shopham Loop) remaining as a backwater. Land use change to an intensive agricultural regime in turn led to shallower soils and increased siltation and the loop entrance became blocked with deposits preventing any flow from the Rother.

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	Arun and Western Streams

Subcatchment

River name	Western Rother
Area category	100 - 1000 km²
Area (km2)
Maximum altitude category	200 - 500 m
Maximum altitude (m)	241241 m <br />0.241 km <br />24,100 cm <br />
Dominant geology	Calcareous
Ecoregion	Great Britain
Dominant land cover	Arable and Horticulture
Waterbody ID	GB107041012810

Other case studies in this subcatchment: Western Rother Fishery Habitat Enhancement

Site

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Name	Shopham Loop
WFD water body codes	GB107041012810
WFD (national) typology	Low, Medium, Calcareous
WFD water body name	Western Rother
Pre-project morphology	Single channel, High width:depth, Embanked
Reference morphology	Sinuous
Desired post project morphology
Heavily modified water body	Yes
National/international site designation
Local/regional site designations
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology	Artificially regulated
Dominant substrate	Silt, Gravel
River corridor land use	Urban, Intensive agriculture
Average bankfull channel width category	5 - 10 m
Average bankfull channel width (m)
Average bankfull channel depth category	2 - 5 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)	4.974.97 m³/s <br />4,970 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	2000/03/01
Works started
Works completed	2004/09/01
Project completed
Total cost category
Total cost (k€)	580 k€580,000 € <br />
Benefit to cost ratio
Funding sources

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	Structure & condition of riparian zones, Channel pattern/planform, Quantity & dynamics of flow
Biology	Fish
Physico-chemical
Other reasons for the project	Watercourse and floodplain restoration

Measures

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Structural measures
Bank/bed modifications	Re-grading, Creation of stone riffle, Planting
Floodplain / River corridor	Floodplain reconnection, Creation of backwater and ponds
Planform / Channel pattern	Re-instatement of old course, protect old lock from erosion.
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
Structure & condition of riparian zones		Yes	Yes			Improvement
Channel pattern/planform		Yes	Yes			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
Invertebrates	Yes	Yes	No	Yes	No	Inconclusive
Fish	No	Yes	No	Yes	Yes	Improvement
Macrophytes	No	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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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/GESO0910BSTC-E-E.pdf	Environment Agency WFD Classification - See P.190.
http://www.therrc.co.uk/case studies/rother%20at%20shopham%20loop%20final.pdf	RRC Case Study - Shopham Loop
http://www.therrc.co.uk/MOT/Final Versions (Secure)/1.9 Shopham Loop.pdf	RRC Manual of Techniques best practice case study
http://www.therrc.co.uk/MOT/References/RRC Shopham Report FINAL.pdf	RRC report on the monitoring of the project - analysis & evaluation
http://www.therrc.co.uk/MOT/References/Darby 2003 Geomorph Basis Outline Design Shopham Loop.pdf	Geomorphological Basis of the Outline Design for the Shopham Loop Restoration
http://www.therrc.co.uk/PRAGMO/PRAGMO 2012-01-24.pdf#page=110	Shopham case study in RRC's monitoring document 'PRAGMO' (2011)

Supplementary Information

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