Case study:County Gardens, Mayes Brook

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Location: 51° 31' 47", 0° 5' 40"
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Project overview

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Status Planned
Project web site
Themes Flood risk management, Habitat and biodiversity
Country England
Main contact forename Becca
Main contact surname O’Shea
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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Proposals should aim to enhance the area for nature conservation whilst increasing flood storage capacity. Such measures could include the reinstatement of a natural right bank and the incorporation of backwaters and other wetland habitats. The potential for contaminated arising are unknown, however there is scope for the re-use of materials in bund creation. The site identified is a side-spill flood alleviation area situated on the right bank 2400m². The channel is largely linear and has been modified in the past with a reinforced artificial bank and sluice situated centrally on the right bank. The earth-bunded flood storage area comprises well maintained grassland, which is cut 4-6 times a year during the growing season. The area is inundated 3-4 times a year and requires dredging every 5-10years

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Thames
River basin Roding, Beam and Ingrebourne

Subcatchment

River name Seven Kings Water
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 101
101 m
0.101 km
10,100 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106037028170



Other case studies in this subcatchment: Blake Avenue, Mayes Brook, Fairlop Plain and Fairlop Water, Goodmayes Park, Mayes Brook, Loxford Water, Mayesbrook Climate Change Park restoration project, Seven Kings Water


Site

Name
WFD water body codes GB106037028170
WFD (national) typology
WFD water body name Seven Kings Water
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)
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Mean annual discharge (m3/s)
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Average unit stream power (W/m2)


Project background

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Works completed
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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 Flood risk management, Impoundments (not hydropower)
Hydromorphology Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor Creation of wetland
Planform / Channel pattern Creation of backwater
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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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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