Case study:River Restoration at Hunworth (River Glaven)

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Location: 52° 52' 56", 1° 3' 56"
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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://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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Image gallery


Channel sinuosity was increased as a result of the scheme
The functioning of the gauging station has been comprimised by the restoration works
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Catchment and subcatchment

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) 103
103 m
0.103 km
10,300 cm
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

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

Reach length directly affected (m) 320
320 m
0.32 km
32,000 cm
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

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

Structural measures
Bank/bed modifications Channel reprofiling, Re-introducing gravel, Cattle drinkers
Floodplain / River corridor Removal of embankments
Planform / Channel pattern Adding sinuosity
Other
Non-structural measures
Management interventions Reduced maintenance
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

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
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Any other monitoring, e.g. social, economic

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Before measures After measures Qualitative Quantitative


Monitoring documents



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Supplementary Information

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