Case study:Arnos Park - Pymmes Brook: Difference between revisions
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{{Project overview | {{Project overview | ||
|Status=Planned | |Status=Planned | ||
|Themes=Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Urban | |||
|Country=England | |Country=England | ||
|Main contact forename=John | |Main contact forename=John | ||
|Main contact surname=Bryden | |Main contact surname=Bryden | ||
|Contact organisation=Environment Agency | |Contact organisation=Environment Agency | ||
|Contact organisation url=www.gov.uk/government/organisations/environment-agency | |||
|Partner organisations=River Restoration Centre, London Borough of Enfield, London Wildlife Trust, Environment Agency, Greater London Authority, | |||
|Multi-site=No | |Multi-site=No | ||
|Project summary=To re-establish natural geomorphological features within the Pymmes Brook, including the creation of natural instream features, natural banks, wet berms, potentially wetland scrapes and wet grassland i.e. reconnecting the river with the surrounding habitats, its floodplain. | |Project summary=To re-establish natural geomorphological features within the Pymmes Brook, including the creation of natural instream features, natural banks, wet berms, potentially wetland scrapes and wet grassland i.e. reconnecting the river with the surrounding habitats, its floodplain. The first step would be to carry out a feasibility study of the Pymmes Brook though Arnos Park, including the surrounding landscape, defining the potential habitats which could be create and where. This would also give an idea of the cost and time scales involved. Depending on the outcomes of the feasibility study, a topography study of the area maybe needed if the its decide that wet scrapes and marshy areas should be created, thereby defining the works that would be needed to create these areas. An application has been made to the London Mayors Parks Programme (need to see if this project gets funding from this). Get partners together discuss desires for the park and constraints, design and estimate costs and estimate the finances available to the project. | ||
The | |||
The North East Thames River restoration document highlights this area as having potential for full river restoration. The works should include the removal of all impounding structures and artificial embankments. Once this has been completed there should be a low flow channel created which meanders its way along the natural course of the Pymmes (may not be the current course, decided by a topographical study). Outside, the low flow channel a peak flow course should be created, this should include wet berms and setback flood defences to allow the river to naturally flood. These areas should contain back waters, wet berms, natural erosional cliff faces and wetland scrapes, which would significantly improve the biodiversity value of the area and the amenity value to local residents. | The North East Thames River restoration document highlights this area as having potential for full river restoration. The works should include the removal of all impounding structures and artificial embankments. Once this has been completed there should be a low flow channel created which meanders its way along the natural course of the Pymmes (may not be the current course, decided by a topographical study). Outside, the low flow channel a peak flow course should be created, this should include wet berms and setback flood defences to allow the river to naturally flood. These areas should contain back waters, wet berms, natural erosional cliff faces and wetland scrapes, which would significantly improve the biodiversity value of the area and the amenity value to local residents. | ||
The Pymmes Brook is a clay-based river in a high-energy river catchment. Sections of the Pymmes Brook that resemble naturalised river forms exhibit characteristic features of a high-energy system, meanders, small meander cliffs, gravel bars and pool. The river through Arnos Park has been resectioned, constricted, has a concreted lining (in places) and contains a number of weirs which impound and stagnate the water, resulting in extremely poor water quality (GQA class E) as well as a lose of natural morphological features. Arnos Park has been designated as SINC Borough level 2 for it ancient woodland and damp grassland, the pymmes runs through the middle of the park and currently provides little ecological value, while the potential of the river remains huge. A Flood Risk Management project is being investigated for wider benefits and includes potential significant enhancements to this section of river. | The Pymmes Brook is a clay-based river in a high-energy river catchment. Sections of the Pymmes Brook that resemble naturalised river forms exhibit characteristic features of a high-energy system, meanders, small meander cliffs, gravel bars and pool. The river through Arnos Park has been resectioned, constricted, has a concreted lining (in places) and contains a number of weirs which impound and stagnate the water, resulting in extremely poor water quality (GQA class E) as well as a lose of natural morphological features. Arnos Park has been designated as SINC Borough level 2 for it ancient woodland and damp grassland, the pymmes runs through the middle of the park and currently provides little ecological value, while the potential of the river remains huge. A Flood Risk Management project is being investigated for wider benefits and includes potential significant enhancements to this section of river. | ||
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{{ | {{Case study subcatchment | ||
|Subcatchment= | |Subcatchment=Pymmes Brook (upper channel with Muswell St & Bounds Grn Brk) | ||
}} | }} | ||
{{Site | {{Site | ||
|WFD water body code=GB106038027940 | |||
|WFD water body name=Pymmes Brook (upper channel with Muswell St & Bounds Grn Brk) | |||
|Heavily modified water body=No | |||
|Protected species present=No | |||
|WFD water body code= | |Invasive species present=No | ||
|WFD water body name= | |||
|Heavily modified water body= | |||
|Protected species present= | |||
|Invasive species present= | |||
}} | }} | ||
{{ | {{Project background | ||
|Reach length directly affected= | |Reach length directly affected=1000 m | ||
|Project started=2008/01/01 | |||
|Funding sources=Environment Agency Grant in Aid, Local Authorities, Greater London Authority | |||
|Project started= | |||
|Funding sources= | |||
}} | }} | ||
{{Motivations | {{Motivations | ||
|Hydromorphological quality elements= | |Hydromorphological quality elements=Channel pattern/planform, | ||
}} | }} | ||
{{Measures | {{Measures | ||
|Bank and bed modifications measure= | |Bank and bed modifications measure=Creation of berms, Barrier removal, Embankment renaturalization, Creation of low flow channel, Creation of backwaters, | ||
|Floodplain / River corridor=River naturalisation, Scrapes, Floodplain reconnection, Remeandering, | |||
|Floodplain / River corridor= | |||
}} | }} | ||
{{Hydromorphological_quality_elements_header}} | {{Hydromorphological_quality_elements_header}} | ||
Latest revision as of 13:32, 1 November 2018
This case study is pending approval by a RiverWiki administrator.
Location: 51° 37' 16.08" N, 0° 8' 8.59" W
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Project overview
| Status | Planned |
|---|---|
| Project web site | |
| Themes | Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Urban |
| Country | England |
| Main contact forename | John |
| Main contact surname | Bryden |
| Main contact user ID | |
| Contact organisation | Environment Agency |
| Contact organisation web site | http://www.gov.uk/government/organisations/environment-agency |
| Partner organisations | River Restoration Centre, London Borough of Enfield, London Wildlife Trust, Environment Agency, Greater London Authority |
| Parent multi-site project | |
| This is a parent project encompassing the following projects |
No |
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Project summary
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To re-establish natural geomorphological features within the Pymmes Brook, including the creation of natural instream features, natural banks, wet berms, potentially wetland scrapes and wet grassland i.e. reconnecting the river with the surrounding habitats, its floodplain. The first step would be to carry out a feasibility study of the Pymmes Brook though Arnos Park, including the surrounding landscape, defining the potential habitats which could be create and where. This would also give an idea of the cost and time scales involved. Depending on the outcomes of the feasibility study, a topography study of the area maybe needed if the its decide that wet scrapes and marshy areas should be created, thereby defining the works that would be needed to create these areas. An application has been made to the London Mayors Parks Programme (need to see if this project gets funding from this). Get partners together discuss desires for the park and constraints, design and estimate costs and estimate the finances available to the project.
The North East Thames River restoration document highlights this area as having potential for full river restoration. The works should include the removal of all impounding structures and artificial embankments. Once this has been completed there should be a low flow channel created which meanders its way along the natural course of the Pymmes (may not be the current course, decided by a topographical study). Outside, the low flow channel a peak flow course should be created, this should include wet berms and setback flood defences to allow the river to naturally flood. These areas should contain back waters, wet berms, natural erosional cliff faces and wetland scrapes, which would significantly improve the biodiversity value of the area and the amenity value to local residents.
The Pymmes Brook is a clay-based river in a high-energy river catchment. Sections of the Pymmes Brook that resemble naturalised river forms exhibit characteristic features of a high-energy system, meanders, small meander cliffs, gravel bars and pool. The river through Arnos Park has been resectioned, constricted, has a concreted lining (in places) and contains a number of weirs which impound and stagnate the water, resulting in extremely poor water quality (GQA class E) as well as a lose of natural morphological features. Arnos Park has been designated as SINC Borough level 2 for it ancient woodland and damp grassland, the pymmes runs through the middle of the park and currently provides little ecological value, while the potential of the river remains huge. A Flood Risk Management project is being investigated for wider benefits and includes potential significant enhancements to this section of river.
Monitoring surveys and results
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Catchment
Subcatchment
Other case studies in this subcatchment: Friary Park, Friern Barnet Former Sewage Works, Merdian Water development site, Parks between A10 and Melville Gardens, Pymmes Brook and new river crossing point, Weir removal at Tile Kiln Park, Wilmer Way School Playing Field
Site
Project background
Cost for project phases
Reasons for river restoration
Measures
MonitoringHydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
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Supplementary InformationEdit Supplementary Information
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