Case study:Tichborne River Restoration Project - Revision history

Alexrrc at 10:32, 4 January 2019

2019-01-04T10:32:40Z

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	{{Case study status		{{Case study status
	\|Approval status=~~Draft~~		\|Approval status=Approved
	}}		}}
	{{Location		{{Location

Alexrrc at 10:32, 4 January 2019

2019-01-04T10:32:09Z

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	\|Hydromorphological quality elements=SSSI/SAC,		\|Hydromorphological quality elements=SSSI/SAC,
	}}		}}
	{{Measures}}		{{Measures
			\|Bank and bed modifications measure=Channel reprofiling,
			\|Floodplain / River corridor=Habitat diversification, Floodplain reconnection, Connection to wider floodplain,
			\|Planform / Channel pattern=Adding sinuosity, Improving fish migration, Channel naturalisation,
			}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}
	{{End table}}		{{End table}}

Alexrrc at 10:29, 4 January 2019

2019-01-04T10:29:53Z

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	This river restoration project is located on the Cheriton Stream (SU5733930218), a tributary of the River Itchen. The primary objectives of the restoration project were to create a sustainable environment to move the SSSI unit towards favourable condition and enhance the condition of the Special Area of Conservation (SAC) status by:		This river restoration project is located on the Cheriton Stream (SU5733930218), a tributary of the River Itchen. The primary objectives of the restoration project were to create a sustainable environment to move the SSSI unit towards favourable condition and enhance the condition of the Special Area of Conservation (SAC) status by:

	• Restoring natural chalk stream characteristics, e.g. gradient, sinuosity, profile, substrate		• Restoring natural chalk stream characteristics, e.g. gradient, sinuosity, profile, substrate <br>
	• Removing obstacles to fish passage		• Removing obstacles to fish passage<br>
	• Reducing/eliminating the need for human intervention of water level/flow management		• Reducing/eliminating the need for human intervention of water level/flow management<br>
	• Maximising physical and ecological diversity and		• Maximising physical and ecological diversity and <br>
	• Reconnecting the river with the floodplain and wider landscape.		• Reconnecting the river with the floodplain and wider landscape. <br>

	With this in mind Aquascience were employed to design a scheme which reinstated the river channel to a natural course in the flood plain, utilising relict channels wherever possible. The designs ‘off-lined’ the lake converting it to fen meadow and reed-swamp, two habitats which are features of the SSSI. The designs excluded any form of water level management structures and sought an outcome which would function as naturally as possible within this environment. One fixed impoundment and two adjustable sluices were removed. Overall, within the site 825m of channel were either reinstated, created or were enhanced with restored gradient and/or increased flows. In addition, a further 640m of channel were preserved as backwater features with connection to the main channel.		With this in mind Aquascience were employed to design a scheme which reinstated the river channel to a natural course in the flood plain, utilising relict channels wherever possible. The designs ‘off-lined’ the lake converting it to fen meadow and reed-swamp, two habitats which are features of the SSSI. The designs excluded any form of water level management structures and sought an outcome which would function as naturally as possible within this environment. One fixed impoundment and two adjustable sluices were removed. Overall, within the site 825m of channel were either reinstated, created or were enhanced with restored gradient and/or increased flows. In addition, a further 640m of channel were preserved as backwater features with connection to the main channel.

Alexrrc at 10:29, 4 January 2019

2019-01-04T10:29:03Z

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	\|Funding sources=Environment Agency, Natural England, Trustees of the Tichborne Estate		\|Funding sources=Environment Agency, Natural England, Trustees of the Tichborne Estate
	}}		}}
	{{Motivations}}		{{Motivations
			\|Hydromorphological quality elements=SSSI/SAC,
			}}
	{{Measures}}		{{Measures}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

Ascarr at 17:17, 21 February 2018

2018-02-21T17:17:21Z

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	\|Approval status=Draft		\|Approval status=Draft
	}}		}}
	{{Location}}		{{Location
			\|Location=51.06849808476771, -1.1824551888325913
			}}
	{{Project overview		{{Project overview
	\|Status=Complete		\|Status=Complete

Hbarclay at 08:58, 20 February 2018

2018-02-20T08:58:15Z

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	\|Species=Brown Trout, bullhead (Cottus gobio), white clawed crayfish (Austropotamobius pallipes),		\|Species=Brown Trout, bullhead (Cottus gobio), white clawed crayfish (Austropotamobius pallipes),
	}}		}}
	{{Project background}}		{{Project background
			\|Reach length directly affected=375
			\|Project started=January 2014
			\|Total cost category=100 - 500 k€
			\|Funding sources=Environment Agency, Natural England, Trustees of the Tichborne Estate
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

Hbarclay at 08:51, 20 February 2018

2018-02-20T08:51:51Z

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	\|Subcatchment=River Itchen (Cheriton Stream)		\|Subcatchment=River Itchen (Cheriton Stream)
	}}		}}
	{{Site}}		{{Site
			\|Name=Tichborne
			\|WFD water body name=Bourne Rivulet & Cheriton Stream
			\|Heavily modified water body=No
			\|Local site designation=SSSI (Site of Special Scientific Interest), Area of Special Conservation Interest,
			\|Protected species present=No
			\|Invasive species present=No
			\|Species=Brown Trout, bullhead (Cottus gobio), white clawed crayfish (Austropotamobius pallipes),
			}}
	{{Project background}}		{{Project background}}
	{{Motivations}}		{{Motivations}}

Hbarclay at 08:48, 20 February 2018

2018-02-20T08:48:38Z

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	{{Case study subcatchment		{{Case study subcatchment
	\|Subcatchment=~~Tichborne~~		\|Subcatchment=River Itchen (Cheriton Stream)
	}}		}}
	{{Site}}		{{Site}}

Hbarclay at 08:46, 20 February 2018

2018-02-20T08:46:11Z

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	{{Case study subcatchment}}		{{Case study subcatchment
			\|Subcatchment=Tichborne
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	{{Site}}		{{Site}}
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Hbarclay at 08:38, 20 February 2018

2018-02-20T08:38:38Z

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 {{Location}}
 {{Project overview
 |Status=Complete
 |Themes=Environmental flows and water resources, Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Water quality
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 |Contact organisation=Environment Agency SSD
 |Contact organisation url=www.gov.uk/government/organisations/environment-agency
 |Multi-site=No
 }}
 {{Image gallery}}