Case study:Hogsmill River Connectivity Project

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Location: 51° 21' 22", -0° 15' 28"
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Project overview

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Status Complete
Project web site http://www.wandletrust.org/?p=4800
Themes Environmental flows and water resources, Fisheries, Flood risk management, Social benefits
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/?page id=20
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 overall aims of the project are:
1) To resolve fish passage and associated connectivity issues, and thus improve the WFD fish status of the Hogsmill River, by the removal or modification of a series of weirs/culverts which currently seriously impede or completely prevent upstream fish movement.
2) To improve in-stream habitat in two significant stretches of the Hogsmill River, which flow respectively through the Kingston University and the Hogsmill Sewage Treatment works, and thus improve the WFD fish status of the Hogsmill River.

Monitoring surveys and results

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Lessons learnt

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Challenges: -Access to site with machinery.


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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Hogsmill
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 192
192 m
0.192 km
19,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106039017440



Other case studies in this subcatchment: Bonesgate Phase 2, Elmbridge Meadows, Hogsmill Sewage Treatment Works phase 1, Moor Lane Allotments, River Hogsmill Restoration Project, Three Bridge, Kingston


Site

Name
WFD water body codes GB106039017440
WFD (national) typology
WFD water body name Hogsmill
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)
Project started 2012/08/01
Works started
Works completed
Project completed 2013/10/31
Total cost category more than 10000 k€
Total cost (k€) 100000
100,000 k€
100,000,000 €
Benefit to cost ratio
Funding sources Defra Catchment Restoration Fund

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, Flood risk management, Impoundments (not hydropower)
Hydromorphology
Biology Fish
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Weir removal, Deculverting, Weir modification
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement) Community involvement
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




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Additional links and references

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Supplementary Information

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