Case study:Longbridge West - Revision history

PhoebeRyding at 14:43, 17 February 2023

2023-02-17T14:43:46Z

← Older revision		Revision as of 14:43, 17 February 2023
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	A two-phase approach has been undertaken to re-naturalise and restore the River Rea and Callow Brook through the West Works Site. The first phase of the re-naturalisation comprised approximately 200m of the River Rea, which was constructed offline in 2019-2020. In the following two years, the second phase, comprising the remaining 750m of the River Rea (an Environment Agency Main River) and 100m of its tributary, the Callow Brook (an ordinary watercourse), have been restored in a two-stage, green-blue corridor offering biodiversity enhancements, amenity space and online flood mitigation storage.		A two-phase approach has been undertaken to re-naturalise and restore the River Rea and Callow Brook through the West Works Site. The first phase of the re-naturalisation comprised approximately 200m of the River Rea, which was constructed offline in 2019-2020. In the following two years, the second phase, comprising the remaining 750m of the River Rea (an Environment Agency Main River) and 100m of its tributary, the Callow Brook (an ordinary watercourse), have been restored in a two-stage, green-blue corridor offering biodiversity enhancements, amenity space and online flood mitigation storage.
	Both phases of work comprised extensive removal of hard-engineered structures lining the existing banks and bed of the watercourses (which included a concrete river bank and bed, sheet piling, bag work, a number of derelict former bridge crossings and brick walls) to enable construction of a two-stage channel with provision of online attenuation storage. These works have also created new public open spaces within the adjacent River Park, with a new pedestrian/cycle crossing and separate vehicular crossing to enable a sustainable green link adjacent to the river. In addition, the online attenuation storage generates a significant reduction in existing flood risk for the downstream areas of Longbridge Town Centre. With regard to ecological enhancement, a gravel bed integrating riffles and pools has been constructed, complimented by a diverse variety of native planting throughout the two-stage channel, with three stilling pools with varying wet-dry nature to provide different habitats for wildlife. Furthermore, Natural Flood Management (NFM) measures have been embedded, with ‘leaky dam’ features to ‘slow the flow’ within the flashy, urban catchment and provide erosion protection.		Both phases of work comprised extensive removal of hard-engineered structures lining the existing banks and bed of the watercourses (which included a concrete river bank and bed, sheet piling, bag work, a number of derelict former bridge crossings and brick walls) to enable construction of a two-stage channel with provision of online attenuation storage. These works have also created new public open spaces within the adjacent River Park, with a new pedestrian/cycle crossing and separate vehicular crossing to enable a sustainable green link adjacent to the river. In addition, the online attenuation storage generates a significant reduction in existing flood risk for the downstream areas of Longbridge Town Centre. With regard to ecological enhancement, a gravel bed integrating riffles and pools has been constructed, complimented by a diverse variety of native planting throughout the two-stage channel, with three stilling pools with varying wet-dry nature to provide different habitats for wildlife. Furthermore, Natural Flood Management (NFM) measures have been embedded, with ‘leaky dam’ features to ‘slow the flow’ within the flashy, urban catchment and provide erosion protection.
			\|Monitoring surveys and results=Throughout the construction, weekly design team meetings were held with the whole project team and twice weekly site walkovers were undertaken with both engineering and landscaping specialists. This ensured that the wider collaborative vision for the renaturalisation of the watercourse was achieved.
			Further to this, regular calls with both the Environment Agency and Birmingham City Council, in their role as Lead Local Flood Authority, were undertaken; with the Environment Agency undertaking site walkovers throughout the construction of the river works to ensure any further design considerations could be realised prior to completion.
			Throughout the design and construction of the works, priority has been given to realising the multifunctional benefits for both the river corridor itself and surrounding communities. At the heart of the restoration is the creation of new habitat, which has been monitoring and dynamically adjusted throughout the construction. The design principles of the river corridor allow for natural variation and adjustment of the watercourse, thereby ensuring longevity in the habitats created.
	\|Project title=Longbridge West		\|Project title=Longbridge West
	}}		}}

PhoebeRyding at 14:40, 17 February 2023

2023-02-17T14:40:51Z

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	}}		}}
	{{Location		{{Location
	\|Location=~~longbridge~~		\|Location=52.39654269920013, -1.9914257694674364
			\|Kml file=Comparison Photos - LBW River Rea Satellite.pdf
	}}		}}
	{{Project overview		{{Project overview

PhoebeRyding at 14:36, 17 February 2023

2023-02-17T14:36:48Z

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	\|Subcatchment=River Rea from Source to Griffins Brook		\|Subcatchment=River Rea from Source to Griffins Brook
	}}		}}
	{{Site}}		{{Site
			\|Name=Longbridge West
			\|WFD water body code=GB104028042510
			\|WFD water body name=Rea source to Bourn Brook Water Body
			\|Heavily modified water body=Yes
			\|Protected species present=No
			\|Invasive species present=No
			\|River corridor land use=Urban,
			}}
	{{Project background		{{Project background
	\|Reach length directly affected=200		\|Reach length directly affected=200

PhoebeRyding at 14:34, 17 February 2023

2023-02-17T14:34:22Z

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	\|Contact organisation=PJA		\|Contact organisation=PJA
	\|Contact organisation url=https://pja.co.uk/		\|Contact organisation url=https://pja.co.uk/
			\|Partner organisations=St Modwen Developments Ltd, ACS Ltd, OBriens Ltd & Wakemans
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Photo of Progress on River Rea Renaturalisation Works - March 2022		\|Project picture=Photo of Progress on River Rea Renaturalisation Works - March 2022

PhoebeRyding at 14:33, 17 February 2023

2023-02-17T14:33:02Z

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	}}		}}
	{{Site}}		{{Site}}
	{{Project background}}		{{Project background
			\|Reach length directly affected=200
			\|Project started=2019
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

PhoebeRyding at 14:32, 17 February 2023

2023-02-17T14:32:29Z

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	{{Toggle button}}		{{Toggle button}}
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	{{Case study subcatchment}}		{{Case study subcatchment
			\|Subcatchment=River Rea from Source to Griffins Brook
			}}
	{{Site}}		{{Site}}
	{{Project background}}		{{Project background}}

PhoebeRyding at 14:31, 17 February 2023

2023-02-17T14:31:59Z

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	\|Contact organisation url=https://pja.co.uk/		\|Contact organisation url=https://pja.co.uk/
	\|Multi-site=No		\|Multi-site=No
			\|Project picture=Photo of Progress on River Rea Renaturalisation Works - March 2022
	\|Project summary=The River Rea, and Callow Brook tributary, flows through the original site of the MG Rover Factory West Works in Longbridge, Birmingham, in a formerly hard-engineered, canalized and culverted channel.		\|Project summary=The River Rea, and Callow Brook tributary, flows through the original site of the MG Rover Factory West Works in Longbridge, Birmingham, in a formerly hard-engineered, canalized and culverted channel.
	In 2005, following the collapse of MG Rover, St Modwen Developments Ltd. purchased the former factory site with the aim of creating a sustainable place for people to live and work. Core to this aim, was a commitment to the restoration and re-naturalisation of the River Rea and Callow Brook. In 2008, the first factory buildings situated on the former West Works Site were demolished which included daylighting the majority of the River Rea. The watercourse through this area then remained largely un-altered until works progressed in this area of the West Works Site in 2019.		In 2005, following the collapse of MG Rover, St Modwen Developments Ltd. purchased the former factory site with the aim of creating a sustainable place for people to live and work. Core to this aim, was a commitment to the restoration and re-naturalisation of the River Rea and Callow Brook. In 2008, the first factory buildings situated on the former West Works Site were demolished which included daylighting the majority of the River Rea. The watercourse through this area then remained largely un-altered until works progressed in this area of the West Works Site in 2019.

PhoebeRyding at 14:30, 17 February 2023

2023-02-17T14:30:22Z

← Older revision		Revision as of 14:30, 17 February 2023
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	}}		}}
	{{Project overview		{{Project overview
	~~\|Project title=Longbridge West~~
	\|Status=Complete		\|Status=Complete
	\|Themes=Flood risk management, Habitat and biodiversity, Social benefits, Spatial planning, Water quality, Urban		\|Themes=Flood risk management, Habitat and biodiversity, Social benefits, Spatial planning, Water quality, Urban
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	\|Contact organisation url=https://pja.co.uk/		\|Contact organisation url=https://pja.co.uk/
	\|Multi-site=No		\|Multi-site=No
			\|Project summary=The River Rea, and Callow Brook tributary, flows through the original site of the MG Rover Factory West Works in Longbridge, Birmingham, in a formerly hard-engineered, canalized and culverted channel.
			In 2005, following the collapse of MG Rover, St Modwen Developments Ltd. purchased the former factory site with the aim of creating a sustainable place for people to live and work. Core to this aim, was a commitment to the restoration and re-naturalisation of the River Rea and Callow Brook. In 2008, the first factory buildings situated on the former West Works Site were demolished which included daylighting the majority of the River Rea. The watercourse through this area then remained largely un-altered until works progressed in this area of the West Works Site in 2019.
			A two-phase approach has been undertaken to re-naturalise and restore the River Rea and Callow Brook through the West Works Site. The first phase of the re-naturalisation comprised approximately 200m of the River Rea, which was constructed offline in 2019-2020. In the following two years, the second phase, comprising the remaining 750m of the River Rea (an Environment Agency Main River) and 100m of its tributary, the Callow Brook (an ordinary watercourse), have been restored in a two-stage, green-blue corridor offering biodiversity enhancements, amenity space and online flood mitigation storage.
			Both phases of work comprised extensive removal of hard-engineered structures lining the existing banks and bed of the watercourses (which included a concrete river bank and bed, sheet piling, bag work, a number of derelict former bridge crossings and brick walls) to enable construction of a two-stage channel with provision of online attenuation storage. These works have also created new public open spaces within the adjacent River Park, with a new pedestrian/cycle crossing and separate vehicular crossing to enable a sustainable green link adjacent to the river. In addition, the online attenuation storage generates a significant reduction in existing flood risk for the downstream areas of Longbridge Town Centre. With regard to ecological enhancement, a gravel bed integrating riffles and pools has been constructed, complimented by a diverse variety of native planting throughout the two-stage channel, with three stilling pools with varying wet-dry nature to provide different habitats for wildlife. Furthermore, Natural Flood Management (NFM) measures have been embedded, with ‘leaky dam’ features to ‘slow the flow’ within the flashy, urban catchment and provide erosion protection.
			\|Project title=Longbridge West
	}}		}}
	{{Image gallery}}		{{Image gallery}}

PhoebeRyding: Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=longbridge }} {{Project overview |Project title=Longbridge West |Status=Complete |Themes=Flood risk manageme..."

2023-02-17T14:29:39Z

Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=longbridge }} {{Project overview |Project title=Longbridge West |Status=Complete |Themes=Flood risk manageme..."

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|Country=England
|Main contact forename=Phoebe
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|Multi-site=No
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