Case study:Manthorpe Floodplain Reconnection - Revision history

Dhutchinson at 16:39, 29 February 2024

2024-02-29T16:39:40Z

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	{{Additional Documents end}}		{{Additional Documents end}}
	{{Additional links and references header}}		{{Additional links and references header}}
			{{Additional links and references
			\|Link=www.youtube.com/watch?v=PtZikLDHlP0
			\|Description=Manthorpe Video
			}}
	{{Additional links and references footer}}		{{Additional links and references footer}}
	{{Supplementary Information}}		{{Supplementary Information}}
	{{Toggle content end}}		{{Toggle content end}}

Ascarr at 13:16, 26 February 2024

2024-02-26T13:16:57Z

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	\|Contact organisation url=www.gov.uk/government/organisations/environment-agency		\|Contact organisation url=www.gov.uk/government/organisations/environment-agency
	\|Partner organisations=Wild Trout Trust, Lincolnshire Wildlife Trust.		\|Partner organisations=Wild Trout Trust, Lincolnshire Wildlife Trust.
	\|Name of parent multi-site project=Upper Witham Restoration		\|Name of parent multi-site project=Case_study:Upper Witham Restoration
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=EMRA0714.JPG		\|Project picture=EMRA0714.JPG

Ascarr at 12:24, 26 February 2024

2024-02-26T12:24:16Z

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	\|Main contact forename=Matt		\|Main contact forename=Matt
	\|Main contact surname=Parr		\|Main contact surname=Parr
	\|Contact organisation=~~Enviroment~~ Agency		\|Contact organisation=Environment Agency
	\|Contact organisation url=www.gov.uk/government/organisations/environment-agency		\|Contact organisation url=www.gov.uk/government/organisations/environment-agency
	\|Partner organisations=Wild Trout Trust, Lincolnshire Wildlife Trust.		\|Partner organisations=Wild Trout Trust, Lincolnshire Wildlife Trust.
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	There were five components to the scheme:		There were five components to the scheme:

	• Removal of redundant flood bank, and lowering of the floodplain to create a terraced floodplain with a lower more frequently connected floodplain and a higher terrace of un-lowered floodplain. This gives maximum		*Removal of redundant flood bank, and lowering of the floodplain to create a terraced floodplain with a lower more frequently connected floodplain and a higher terrace of un-lowered floodplain. This gives maximum
	benefit to the river and natural processes whilst providing some variation in flood event storage and habitat evolution and variety.		benefit to the river and natural processes whilst providing some variation in flood event storage and habitat evolution and variety.
			*Addition of riffles and gravel supply in the form of point bars and islands and splitting of channel into multiple threads creating a more natural form and allowing the river space to adjust to changes in flow but also allow natural processes like silt deposition, channel evolution, less intensive management, woody material to be retained in channel and on flood plain. The gravel raises the bed helping to connect the river into the floodplain reducing the amount of spoil generated to lower floodplain as well as providing rich habitats for riverine wildlife.
	• Addition of riffles and gravel supply in the form of point bars and islands and splitting of channel into multiple threads creating a more natural form and allowing the river space to adjust to changes in flow but also allow natural processes like silt deposition, channel evolution, less intensive management, woody material to be retained in channel and on flood plain. The gravel raises the bed helping to connect the river into the floodplain reducing the amount of spoil generated to lower floodplain as well as providing rich habitats for riverine wildlife.		*Creation of floodplain ponds and terrestrial habitat features like habitat piles, stone piles for hibernacular, and woody material on the floodplain to encourage further hydraulic roughness in high flow events
			*Spreading of spoil over the top of the valley sides outside of the floodplain, this was then reseeded with appropriate wildflower grassland mix and provides pollinator benefits.
	• Creation of floodplain ponds and terrestrial habitat features like habitat piles, stone piles for hibernacular, and woody material on the floodplain to encourage further hydraulic roughness in high flow events

	• Spreading of spoil over the top of the valley sides outside of the floodplain, this was then reseeded with appropriate wildflower grassland mix and provides pollinator benefits.
	\|Monitoring surveys and results=Brown trout have already been observed spawning on the new limestone gravels. Crayfish monitoring was carried out pre works and showed a very low baseline population with only 6 individuals caught, repeat monitoring of this will be carried out along with repeat bird surveys of the site.		\|Monitoring surveys and results=Brown trout have already been observed spawning on the new limestone gravels. Crayfish monitoring was carried out pre works and showed a very low baseline population with only 6 individuals caught, repeat monitoring of this will be carried out along with repeat bird surveys of the site.
	\|Lessons learn=~~4200 m3~~ of earth was removed from the floodplain during the lowering and removal of embankments. Reconnecting the floodplain has created 19,500m3 of space for water which now reconnects to the lower floodplain frequently after intense rainfall events at a 1 in 2 event magnitude.		\|Lessons learn=4200m3 of earth was removed from the floodplain during the lowering and removal of embankments. Reconnecting the floodplain has created 19,500m3 of space for water which now reconnects to the lower floodplain frequently after intense rainfall events at a 1 in 2 event magnitude.
	\|Project title=Manthorpe Floodplain Reconnection		\|Project title=Manthorpe Floodplain Reconnection
	}}		}}

Dhutchinson at 16:19, 8 February 2024

2024-02-08T16:19:42Z

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	{{Measures		{{Measures
	\|Bank and bed modifications measure=Channel modification, Gravel added, Tree Hinging,		\|Bank and bed modifications measure=Channel modification, Gravel added, Tree Hinging,
	\|Floodplain / River corridor=Redundant Flood Bank Removed, Floodplain Lowered, Floodplain Roughened.		\|Floodplain / River corridor=Redundant Flood Bank Removed, Floodplain Lowered, Floodplain Roughened, Ponds added.
	\|Planform / Channel pattern=Multiple channels added		\|Planform / Channel pattern=Multiple channels added
	\|Other technical measure=Wild Flower Meadow area created.		\|Other technical measure=Wild Flower Meadow area created.

Dhutchinson at 16:19, 8 February 2024

2024-02-08T16:19:13Z

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	{{Monitoring documents end}}		{{Monitoring documents end}}
	{{Additional Documents}}		{{Additional Documents}}
			{{Case study documents
			\|File name=Case Study Manthorpe Restoration.pdf
			}}
	{{Additional Documents end}}		{{Additional Documents end}}
	{{Additional links and references header}}		{{Additional links and references header}}

Dhutchinson at 16:18, 8 February 2024

2024-02-08T16:18:19Z

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	\|Physico-chemical quality elements=Phosphate		\|Physico-chemical quality elements=Phosphate
	}}		}}
	{{Measures}}		{{Measures
			\|Bank and bed modifications measure=Channel modification, Gravel added, Tree Hinging,
			\|Floodplain / River corridor=Redundant Flood Bank Removed, Floodplain Lowered, Floodplain Roughened.
			\|Planform / Channel pattern=Multiple channels added
			\|Other technical measure=Wild Flower Meadow area created.
			}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}
	{{End table}}		{{End table}}

Dhutchinson at 16:15, 8 February 2024

2024-02-08T16:15:42Z

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	\|Works and supervision Other contact surname=Mungovan		\|Works and supervision Other contact surname=Mungovan
	}}		}}
	{{Motivations}}		{{Motivations
			\|Specific mitigation=Land Drainage
			\|Biological quality elements=Fish,
			\|Physico-chemical quality elements=Phosphate
			}}
	{{Measures}}		{{Measures}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

Dhutchinson at 16:15, 8 February 2024

2024-02-08T16:15:01Z

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	\|Project picture=EMRA0714.JPG		\|Project picture=EMRA0714.JPG
	\|Picture description=Project after completion.		\|Picture description=Project after completion.
	\|Project summary=There were five components to the scheme:		\|Project summary=This project was jointly undertaken by the Wild Trout Trust and Environment Agency.

			There were five components to the scheme:

	• Removal of redundant flood bank, and lowering of the floodplain to create a terraced floodplain with a lower more frequently connected floodplain and a higher terrace of un-lowered floodplain. This gives maximum		• Removal of redundant flood bank, and lowering of the floodplain to create a terraced floodplain with a lower more frequently connected floodplain and a higher terrace of un-lowered floodplain. This gives maximum

Dhutchinson at 16:14, 8 February 2024

2024-02-08T16:14:10Z

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	\|Species=Native Crayfish / Brown Trout,		\|Species=Native Crayfish / Brown Trout,
	}}		}}
	{{Project background}}		{{Project background
			\|Reach length directly affected=325
			\|Total cost category=100 - 500 k€
			\|Total1 cost=229
			\|Funding sources=EA
			\|Investigation and design Lead organisation=Environement Agency
			\|Investigation and design Other contact forename=Matt
			\|Investigation and design Other contact surname=Parr
			\|Works and supervision Lead organisation=Wild Trout Trust
			\|Works and supervision Other contact forename=Rob
			\|Works and supervision Other contact surname=Mungovan
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

Dhutchinson at 16:10, 8 February 2024

2024-02-08T16:10:52Z

← Older revision		Revision as of 16:10, 8 February 2024
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	\|Subcatchment=Upper Witham		\|Subcatchment=Upper Witham
	}}		}}
	{{Site}}		{{Site
			\|Name=Manthorpe Floodplain Reconnection
			\|WFD water body code=GB105030056780
			\|WFD water body name=Witham - confluence of Cringle Brook to confluence Brant
			\|Heavily modified water body=No
			\|Protected species present=Yes
			\|Invasive species present=No
			\|Species=Native Crayfish / Brown Trout,
			}}
	{{Project background}}		{{Project background}}
	{{Motivations}}		{{Motivations}}