Case study:Lewisham College weir

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Location: 51° 28' 31", -0° 1' 22"
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Project overview

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Status Planned
Project web site
Themes Fisheries, Habitat and biodiversity
Country England
Main contact forename Peter
Main contact surname Gray
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
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Project summary

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Options for removal or modification/lowering to increase fish passage and create intertidal habitat upstream. Lewisham College half tide weirs at top of Deptford Creek. Concrete raised channel above, intertidal mudflat of creek below. Barrier to fish migration at low states of tide and overtops at high water.
Need to confirm funding to progress project

Monitoring surveys and results

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Fisheries survey
Stated objectives
Pre-project data

Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Ravensbourne (Catford to Deptford)
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 132
132 m
0.132 km
13,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Urban
Waterbody ID GB106039023270



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Site

Name
WFD water body codes GB106039023270
WFD (national) typology
WFD water body name Ravensbourne (Catford to Deptford)
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
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources Adjacent development, Defra WFD-fish passage funding, 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 Barriers to fish migration
Hydromorphology Structure & condition of intertidal zone
Biology Fish
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Removing of concrete structures
Floodplain / River corridor Habitat creation
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

Biological quality elements

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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

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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