Case study:Morden Hall Park Water Vole Habitat Enhancement

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Location: 51° 23' 52", -0° 11' 4"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity
Country England
Main contact forename Chris
Main contact surname Strachan
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.gov.uk/government/organisations/environment-agency
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
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Project summary

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The objective is to create natural banks that water voles can occupy through the removal of wooden toe-boarding.
Toe-boarding was removed from 500m of bank. Where there was a liklihood of bank collapse, on bends and around small islands, the boards were either left or a sympathetic replacement such as coir matting was used. Morden Hall Park is a former deer park currently owned by the National Trust. The river Wandle and several man-made channels flow through the park, the banks of which are protected by wooden toe-boarding. Water voles are currently absent on the river and there are future plans to re-introduce them at this site.
The project is part of the London Water Vole Project.

Monitoring surveys and results

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Lessons learnt

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The banks remained fairly stable where the boards had been removed. Any slumping or collapse will be left to allow the formation of natural features. Future planting of emergent vegetation types may be needed to enhance the marginal habitat.


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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Wandle (Croydon to Wandsworth) and the R. Gravney
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 282
282 m
0.282 km
28,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106039023460



Other case studies in this subcatchment: Beddington Park, Beddington Park Enhancements, Boulder Pool and Plough Lane, Durand Close, EDF Weir removal, Eel Pass over tilting weir at Ravensbury Park, Garratt Park, Hackbridge Restoration, Hackbridge weir notch, King Georges Park... further results


Site

Name
WFD water body codes GB106039023460
WFD (national) typology
WFD water body name Wandle (Croydon to Wandsworth) and the R. Gravney
Pre-project morphology
Reference morphology
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
Dominant hydrology
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
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Average bankfull channel depth (m)
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Project background

Reach length directly affected (m) 750 m
0.75 km
75,000 cm
Project started 2008/01/01
Works started
Works completed 2009/01/01
Project completed
Total cost category 50 - 100 k€
Total cost (k€)
Benefit to cost ratio
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Cost for project phases

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Investigation and design
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Works and works supervision
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Reasons for river restoration

Mitigation of a pressure Riparian development
Hydromorphology
Biology Vertebrates
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Bank reprofiling, Toeboard removal
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

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Any other monitoring, e.g. social, economic

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Monitoring documents



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Supplementary Information

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