Case study:Lowdham NFM - Revision history

Ascarr at 12:09, 6 April 2020

2020-04-06T12:09:45Z

Alexrrc at 10:01, 25 February 2020

2020-02-25T10:01:06Z

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

Alexrrc at 10:00, 25 February 2020

2020-02-25T10:00:47Z

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	\|Specific mitigation=Flood risk management,		\|Specific mitigation=Flood risk management,
	}}		}}
	{{Measures}}		{{Measures
			\|Floodplain / River corridor=Containment bund to prevent flooding, Tree planting, Floodplain reconnection, Deculverting,
			\|Planform / Channel pattern=leaky woody dams,
			}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}
	{{End table}}		{{End table}}

Alexrrc at 09:57, 25 February 2020

2020-02-25T09:57:55Z

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	\|Investigation and design Other contact surname=Graham		\|Investigation and design Other contact surname=Graham
	}}		}}
	{{Motivations}}		{{Motivations
			\|Specific mitigation=Flood risk management,
			}}
	{{Measures}}		{{Measures}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

Alexrrc at 09:56, 25 February 2020

2020-02-25T09:56:20Z

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	\|Approval status=Draft		\|Approval status=Draft
	}}		}}
	{{Location}}		{{Location
			\|Location=53.0110524360625, -1.0060642903001193
			}}
	{{Project overview		{{Project overview
	\|Status=Complete		\|Status=Complete

Alan Graham at 12:24, 24 February 2020

2020-02-24T12:24:58Z

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	\|Contact organisation=Trent Rivers Trust		\|Contact organisation=Trent Rivers Trust
	\|Contact organisation url=trentriverstrust.org		\|Contact organisation url=trentriverstrust.org
	\|Partner organisations=~~Enviroment~~ Agency, Nottinghamshire County Council,		\|Partner organisations=Environment Agency, Nottinghamshire County Council,
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Floodplain reconnection.JPG		\|Project picture=Floodplain reconnection.JPG

Alan Graham at 12:24, 24 February 2020

2020-02-24T12:24:11Z

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	\|Contact organisation=Trent Rivers Trust		\|Contact organisation=Trent Rivers Trust
	\|Contact organisation url=trentriverstrust.org		\|Contact organisation url=trentriverstrust.org
			\|Partner organisations=Enviroment Agency, Nottinghamshire County Council,
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Floodplain reconnection.JPG		\|Project picture=Floodplain reconnection.JPG

Alan Graham at 12:22, 24 February 2020

2020-02-24T12:22:21Z

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	}}		}}
	{{Site}}		{{Site}}
	{{Project background}}		{{Project background
			\|Reach length directly affected=6km
			\|Project started=2018/02/01
			\|Works started=2018/11/01
			\|Works completed=2020/01/01
			\|Project completed=2021/03/01
			\|Total cost category=50 - 100 k€
			\|Funding sources=Defra funded NFM Community projects
			\|Investigation and design Lead organisation=Trent Rivers Trust
			\|Investigation and design Other contact forename=Alan
			\|Investigation and design Other contact surname=Graham
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

Alan Graham at 12:08, 24 February 2020

2020-02-24T12:08:41Z

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	{{Case study subcatchment		{{Case study subcatchment
	\|Subcatchment=~~Coker~~ Beck		\|Subcatchment=Cocker Beck catchment (trib of Trent)
	}}		}}
	{{Site}}		{{Site}}

Alan Graham at 12:05, 24 February 2020

2020-02-24T12:05:58Z

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	{{Case study subcatchment}}		{{Case study subcatchment
			\|Subcatchment=Coker Beck
			}}
	{{Site}}		{{Site}}
	{{Project background}}		{{Project background}}

← Older revision		Revision as of 12:09, 6 April 2020
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	\|Project picture=Floodplain reconnection.JPG		\|Project picture=Floodplain reconnection.JPG
	\|Project summary=The villages of Lambley and Lowdham are situated on the Lambley Dumble/Cocker Beck and currently have 200 homes at significant risk of flooding. Several flood events in both villages have taken place in recent years. The watercourse is extremely flashy draining surface water from the edge of Nottingham. It flows in general within a steep sided wooded valley locally called a dumble, opening up as it approaches the villages.		\|Project summary=The villages of Lambley and Lowdham are situated on the Lambley Dumble/Cocker Beck and currently have 200 homes at significant risk of flooding. Several flood events in both villages have taken place in recent years. The watercourse is extremely flashy draining surface water from the edge of Nottingham. It flows in general within a steep sided wooded valley locally called a dumble, opening up as it approaches the villages.
	As part of the Defra funded NFM Community projects, TRT have been asked to introduce Natural Flood Management (NFM) works which will complement the Environment Agency flood relief scheme for Lowdham in Nottinghamshire.		As part of the Defra funded Natural Flood Management (NFM) Community projects, TRT have been asked to introduce Natural Flood Management (NFM) works which will complement the Environment Agency flood relief scheme for Lowdham in Nottinghamshire.


	TRT have been able to determine areas suitable for NFM features in a lowland setting on both watercourses and overland pathways. The aim was to reduce peak flood flows, enhance biodiversity, improve water quality and increase community awareness and involvement.		TRT have been able to determine areas suitable for NFM features in a lowland setting on both watercourses and overland pathways. The aim was to reduce peak flood flows, enhance biodiversity, improve water quality and increase community awareness and involvement.
	Measures included a number of attenuation bunds, leaky barriers, tree planting, de-culverting and floodplain reconnection. Work commenced in January 2018 with landowner engagement and walkovers on the Lambley Dumble and Cocker Beck. Construction commenced in November 2018 with 18m of concrete culvert being removed allowing the creation of a new section of sinuous channel.		Measures included a number of attenuation bunds, leaky barriers, tree planting, de-culverting and floodplain reconnection. Work commenced in January 2018 with landowner engagement and walkovers on the Lambley Dumble and Cocker Beck. Construction commenced in November 2018 with 18m of concrete culvert being removed allowing the creation of a new section of sinuous channel.
	\|Monitoring surveys and results=Individual NFM features have been monitored using time lapse photography to show how they function during high flows and show how the locations of the work recover and ~~develope~~. Additional monitoring is ongoing to assess the impacts of NFM measures on suspended sediment concentrations regarding the bunds installed. Two turbidity sondes (one upstream and one downstream) have been installed to achieve this and assess the cumulative impact of the catchment-wide features.		\|Monitoring surveys and results=Individual NFM features have been monitored using time lapse photography to show how they function during high flows and show how the locations of the work recover and develop. Additional monitoring is ongoing to assess the impacts of NFM measures on suspended sediment concentrations regarding the bunds installed. Two turbidity sondes (one upstream and one downstream) have been installed to achieve this and assess the cumulative impact of the catchment-wide features.


	Monitoring is continuing into 2020. Initial results indicate a reduction of sediment within the watercourse downstream of the floodplain reconnection. During peak flow the interventions are slowing the flow, pushing water onto the floodplain and reducing peak levels.		Monitoring is continuing into 2020. Initial results indicate a reduction of sediment within the watercourse downstream of the floodplain reconnection. During peak flow the interventions are slowing the flow, pushing water onto the floodplain and reducing peak levels.
	\|Lessons learn=TRT felt that although the project was primarily to deliver NFM and evaluate its performance that we would be able to deliver multiply benefits to the waterbody. We have been successful in these aims and have taken a lot of lessons from the project.		\|Lessons learn=TRT felt that although the project was primarily to deliver NFM and evaluate its performance that we would be able to deliver multiply benefits to the waterbody. We have been successful in these aims and have taken a lot of lessons from the project.
	• Do not under estimate the amount of time needed to engage with farmers, landowners and parish councils.		* Do not under estimate the amount of time needed to engage with farmers, landowners and parish councils.
	• Not everyone believes that NFM will work and some landowners will refuse to allow you to undertake the work on their land.		* Not everyone believes that NFM will work and some landowners will refuse to allow you to undertake the work on their land.
	• TRT delivered over 50 interventions, which proved successful but the number was largely determined by opportunities that arose. For NFM to be really successful it needs to be upscale and delivered on a far broader scale.		* TRT delivered over 50 interventions, which proved successful but the number was largely determined by opportunities that arose. For NFM to be really successful it needs to be upscale and delivered on a far broader scale.
	• It is relatively easy to deliver leaky barriers, but more difficult to deliver river restoration, storage and wetland areas.		* It is relatively easy to deliver leaky barriers, but more difficult to deliver river restoration, storage and wetland areas.
	\|Project title=Lowdham NFM		\|Project title=Lowdham NFM
	}}		}}