Case study:River Restoration at Hunworth (River Glaven)

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Location: 52° 52' 56.13" N, 1° 3' 56.48" E

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Project overview

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Status	Complete
Project web site	http://http://www.wildtrout.org/content/river-glaven-hunworth
Themes	Fisheries, Habitat and biodiversity, Hydromorphology, Land use management - agriculture
Country	England
Main contact forename	Ian
Main contact surname	Shepperd
Main contact user ID
Contact organisation	River Glaven Conservation Group
Contact organisation web site	http://http://www.riverglaven.co.uk/
Partner organisations	Environment Agency, Centre for Fisheries and Aquaculture Science, Wild Trout Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

Looking downstream from the dismantled railway

Project summary

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The river restoration work carried out on the River Glaven at Hunworth was done with a view to returning the river to a more natural state. The scheme involved a number of organisations, including the Environment Agency, the Wild Trout Trust, the River Glaven Conservation Group and the Centre for Environment, Fisheries and Aquaculture. A variety of techniques were employed, including channel reprofiling, the reintroduction of gravels and the installation of cattle drinks.

Since the works were completed in 2010 the River Glaven (Waterbody ID: GB105034055780) has improved from Moderate ecological status (as designated in the Anglian River Basin Management Plan) to Good ecological status, with specific improvements in macroinvertebrate and fish populations.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Anglian
River basin	North Norfolk

Subcatchment

River name	Glaven
Area category	10 - 100 km²
Area (km2)
Maximum altitude category	100 - 200 m
Maximum altitude (m)	103103 m <br />0.103 km <br />10,300 cm <br />
Dominant geology	Calcareous
Ecoregion	Great Britain
Dominant land cover	Arable and Horticulture
Waterbody ID	GB105034055780

Other case studies in this subcatchment: Nine Chalk Rivers Project - Glaven Catchment, River Glaven conservation group

Site

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Name	Hunworth
WFD water body codes	GB105034055780
WFD (national) typology	Low, Small, Calcareous
WFD water body name	Glaven
Pre-project morphology	Straightened
Reference morphology	Sinuous
Desired post project morphology
Heavily modified water body	Yes
National/international site designation
Local/regional site designations
Protected species present	Yes
Invasive species present	Yes
Species of interest
Dominant hydrology	Groundwater
Dominant substrate	Gravel
River corridor land use	Intensive agriculture (arable)
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	0.1 - 1.0 m³/s
Mean annual discharge (m3/s)
Average channel gradient category	Less than 0.001
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	320320 m <br />0.32 km <br />32,000 cm <br />
Project started	2009/03/01
Works started	2013/08/02
Works completed	2010/08/18
Project completed	2011/01/01
Total cost category	10 - 50 k€
Total cost (k€)
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	l
Hydromorphology	Channel pattern/planform, Flow velocities, Quantity & dynamics of flow, Freshwater flow regime, Substrate conditions, Floodplain connectivity
Biology	Fish, Invertebrates, Macrophytes, Diatoms
Physico-chemical	Oxygen balance, Dissolved Oxygen
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Channel reprofiling, reintroducing gravel, installation of cattle drinks
Floodplain / River corridor	Removal of embankments
Planform / Channel pattern	Increase in sinuosity
Other
Non-structural measures
Management interventions	Reduced maintenance
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

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Physico-chemical quality elements

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quality elements

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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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File:One of several new meander bends

Channel sinuosity was increased as a result of the scheme

File:Signage for the Hunworth gauging station

The functioning of the gauging station has been comprimised by the restoration works

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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