Case study:Parks between A10 and Melville Gardens

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Location: 51° 36' 47", -0° 6' 4"
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Project overview

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Status Planned
Project web site
Themes Economic aspects, Fisheries, Habitat and biodiversity, Social benefits
Country England
Main contact forename Joanna
Main contact surname Heisse
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site
Partner organisations Community Groups
Parent multi-site project
This is a parent project
encompassing the following
projects
No
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Project summary

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Community groups to undertake removal of overshading trees. EA to sensitively dredge the over silted channel and remove impounding Penstock weir to return to a natural geomorphological features. The area has significant community interest with a number of open spaces and footpaths by the river. The river is broadly natural but is in relatively poor state. River is overshaded in places and a weir with penstock sluice impounds the bottom section of the river as it goes under the A10.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Pymmes Brook (upper channel with Muswell St & Bounds Grn Brk)
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 131
131 m
0.131 km
13,100 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106038027940



Other case studies in this subcatchment: Arnos Park - Pymmes Brook, Friary Park, Friern Barnet Former Sewage Works, Merdian Water development site, Pymmes Brook and new river crossing point, Weir removal at Tile Kiln Park, Wilmer Way School Playing Field


Site

Name
WFD water body codes GB106038027940
WFD (national) typology
WFD water body name Pymmes Brook (upper channel with Muswell St & Bounds Grn Brk)
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) 3001000 m
3,001 km
300,100,000 cm
Project started 2008/01/01
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources Environment Agency, London Borough of Enfield, Community groups

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 Impoundments (not hydropower)
Hydromorphology Continuity for sediments, Substrate conditions
Biology
Physico-chemical
Other reasons for the project Community demand


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor Tree management
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

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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