Case study:River Wandle: Butter Hill Phase 1: Difference between revisions

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{{Location
{{Location
|Location=51.3703956604003, -0.159843116998672
|Location=51.36809344333213, -0.16210089437663555
}}
}}
{{Project overview
{{Project overview
|Status=Planned
|Status=Complete
|Themes=Fisheries, Habitat and biodiversity
|Themes=Fisheries, Habitat and biodiversity
|Country=England
|Country=England
|Main contact forename=Dave
|Main contact forename=Bella
|Main contact surname=Bartlett
|Main contact surname=Davies
|Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council
|Contact organisation=Wandle Trust
|Contact organisation url=www.wandletrust.org
|Partner organisations=Wandle Trust, Wild Trout Trust, Environment Agency, London Borough of Sutton,
|Name of parent multi-site project=Case_study:River Wandle Restoration Project
|Multi-site=No
|Multi-site=No
|Project summary=Reduction in height of three weirs and habitat creation in preparation for the reintroduction of a population of Wandle Trout. Fish pass on Butterhill Mill. In-stream diversity, weir adjustment and habitat connectivity. Fish pass on large weir sluice. Failing WFD for fish pass due to impassible nature of the river, and the prime trout habitat in the area is currently inaccessible. A lack of native trout and suitable connected habitat. Designing for low flow and climate change. Previously deculverted and restored stretch of the Wandle ecologically isolated by the weir at Butter Hill Mill
|Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project "River Wandle Restoration Project".  
 
This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers.  
 
The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.
 
The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on  the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.
 
The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.
|Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.
}}
}}
{{Image_gallery}}
{{Image_gallery}}
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{{Site
{{Site
|Name=
|WFD water body code=GB106039017640
   
|WFD water body name=Wandle (Carshalton Branch at Carshalton)
   
|Heavily modified water body=No
     
|Protected species present=No
|WFD water body code=
|Invasive species present=No
     
|WFD (national) typology=
     
|WFD water body name=
     
|Pre-project morphology=
     
|Reference morphology=
     
|Heavily modified water body=
     
|Local site designation=
     
|Site designation=
     
|Protected species present=
     
|Invasive species present=
     
|Species=
     
|Dominant hydrology=
     
|Dominant substrate=
     
|River corridor land use=
     
|Average bankfull channel width category=
     
|Avrg bankfull channel width=
     
|Average bankfull channel depth category=
     
|Avrg1 bankfull channel depth=
     
|Mean discharge category=
     
|Mn discharge=
     
|Average channel gradient category=
     
|Avrg channel gradient=
     
}}
}}
{{Project background
{{Project background
|Reach length directly affected=360 m
|Reach length directly affected=360 m
|Project started=2009/01/01
|Project started=2009/01/01
|Works started=2010/01/01
|Works completed=2011/12/31
|Total cost category=10 - 50 k€
|Total cost category=10 - 50 k€
|Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA
|Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, Defra
}}
}}
{{Motivations
{{Motivations
|Hydromorphological quality elements=
|Specific mitigation=Barriers to fish migration
   
|Hydromorphological quality elements=Continuity for organisms, Quantity & dynamics of flow
   
|Biological quality elements=Fish
     
|Biological quality elements=
     
|Physico-chemical quality elements=
     
|Specific mitigation=
     
|Other motivation=
     
}}
}}
{{Measures
{{Measures
|Bank and bed modifications measure=
|Bank and bed modifications measure=Weir modification,
   
|Planform / Channel pattern=Creation of fish passes,
   
     
|Floodplain / River corridor=
     
|Planform / Channel pattern=
     
|Other technical measure=
     
|Management interventions=
     
|Social measures=
     
|Wider stakeholder / citizen engagement=
     
}}
}}
{{Hydromorphological_quality_elements_header}}
{{Hydromorphological_quality_elements_header}}

Latest revision as of 12:14, 1 November 2018

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Location: 51° 22' 5.14" N, 0° 9' 43.56" W
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Project overview

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Status Complete
Project web site
Themes Fisheries, Habitat and biodiversity
Country England
Main contact forename Bella
Main contact surname Davies
Main contact user ID
Contact organisation Wandle Trust
Contact organisation web site http://www.wandletrust.org
Partner organisations Wandle Trust, Wild Trout Trust, Environment Agency, London Borough of Sutton
Parent multi-site project

Case_study:River Wandle Restoration Project

This is a parent project
encompassing the following
projects 		No
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Project summary

Edit project overview to modify the project summary.


This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project "River Wandle Restoration Project".

This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers.   The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.

The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.

The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.

Monitoring surveys and results

Edit project overview to modify the Monitoring survey and results.


Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.

Lessons learnt

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Image gallery


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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Wandle (Carshalton Branch at Carshalton)
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 160160 m <br />0.16 km <br />16,000 cm <br />
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106039017640



Other case studies in this subcatchment: Butter Hill Phase 2, River Wandle Restoration Project, River Wandle: Silt & SuDs, Wandle River Restoration Project: Hackbridge


Site

Name
WFD water body codes GB106039017640
WFD (national) typology
WFD water body name Wandle (Carshalton Branch at Carshalton)
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)
Average bankfull channel depth category
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) 360 m0.36 km <br />36,000 cm <br />
Project started 2009/01/01
Works started 2010/01/01
Works completed 2011/12/31
Project completed
Total cost category 10 - 50 k€
Total cost (k€)
Benefit to cost ratio
Funding sources Environment Agency, Thames Water Wandle River Restoration Fund, Defra

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 Barriers to fish migration
Hydromorphology Continuity for organisms, Quantity & dynamics of flow
Biology Fish
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Weir modification
Floodplain / River corridor
Planform / Channel pattern Creation of fish passes
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

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
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


Monitoring documents



Additional documents and videos


Additional links and references

Link Description

Supplementary Information

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