Case study:RSPB Fowlmere Nature Reserve

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Location: 52° 5' 26", 0° 3' 0"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Hydromorphology, Social benefits, Water quality
Country England
Main contact forename Jenny
Main contact surname Mant
Main contact user ID
Contact organisation River Restoration Centre
Contact organisation web site http://www.therrc.co.uk
Partner organisations Environment Agency
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Faggots on the restored Fowlmere

Project summary

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The river had been heavily dredged in the past, resulting in a distinct lack of gravel within the river, and the channel was over-deep and filled with silt. Long profile surveys also indicated that the natural profile of the river had been significantly altered. Habitat restoration work progressed in three phases:

- Riffle creation in March 2006 (~30m) - Marginal habitat enhancement in 2007 (~150m) - Bed raising combined with channel narrowing in 2009 (~250m)

Monitoring surveys and results

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Lessons learnt

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Image gallery


Narrowing of the channel at Fowlmere, April 2008
Narrowing channel at Fowlmere, April 2008
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Catchment and subcatchment

Catchment

River basin district Anglian
River basin Cam and Ely Ouse (including South Level)

Subcatchment

River name Shep
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 167
167 m
0.167 km
16,700 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB105033038080



Site

Name Fowlmere Nature Reserve
WFD water body codes GB105033038080
WFD (national) typology
WFD water body name Shep
Pre-project morphology High width:depth, Single channel, Straight
Reference morphology Sinuous, Pool-riffle
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 Quick run-off
Dominant substrate Silt, Sand
River corridor land use Grassland
Average bankfull channel width category 2 - 5 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)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 600 m
0.6 km
60,000 cm
Project started 2006/03/01
Works started
Works completed 2009/12/01
Project completed
Total cost category 10 - 50 k€
Total cost (k€) 14 k€
14,000 €
Benefit to cost ratio
Funding sources Environment Agency

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
Hydromorphology Width & depth variation, Quantity & dynamics of flow, Substrate conditions
Biology Fish: Abundance, Invertebrates, Macrophytes
Physico-chemical
Other reasons for the project Landscape enhancement, Nature development, Recreation


Measures

Structural measures
Bank/bed modifications Cut back of plants, Riffle creation, Placement of log steps to prevent erosion from deer, Bed raising, Placement of faggots
Floodplain / River corridor Protect/restore riparian zone
Planform / Channel pattern Channel narrowing, Adding sinuosity
Other
Non-structural measures
Management interventions Easier management
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
Width & depth variation Yes Yes Improvement
Quantity & dynamics of flow Yes Yes Improvement
Substrate conditions Yes Yes Improvement

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Fish: Abundance Yes Yes Yes Yes Improvement
Invertebrates Yes Yes Yes Improvement
Macrophytes Yes Yes Yes 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
Public awareness of river Yes Yes Yes Improvement


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://publications.environment-agency.gov.uk/PDF/GEAN0910BSPO-E-E.pdf WFD Classification for River Shep - See page 231.
http://http://www.therrc.co.uk/case studies/rrc%20fact%20sheet shep%20at%20rspb%20fowlmere.pdf River Restoration Centre Case Study

Supplementary Information

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