Case study:Ennerdale Mill Weir Removal - Revision history

WCRT at 14:58, 19 February 2019

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	\|File name=DSC04011.JPG		\|File name=DSC04011.JPG
	\|Caption=Gravel & cobble deposition is evident as the river is rapidly re-naturalising and responding to natural processes (December 2018)		\|Caption=Gravel & cobble deposition is evident as the river is rapidly re-naturalising and responding to natural processes (December 2018)
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			{{Case study image
			\|File name=3 days after notching - weir structure exposed.jpg
			\|Caption=3 days after notching - weir structure exposed
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			\|File name=EMD After 2.jpg
			\|Caption=After removal, showing the river bank vegetation recovering
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WCRT at 15:22, 15 February 2019

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	\|Works1 and supervision cost category=100 - 500 k€		\|Works1 and supervision cost category=100 - 500 k€
	\|Works and supervision Lead organisation=Ebsford Environmental		\|Works and supervision Lead organisation=Ebsford Environmental
			\|Post-project1 management and maintenance cost category=1 - 10 k€
	\|Post-project management and maintenance Lead organisation=West Cumbria Rivers Trust		\|Post-project management and maintenance Lead organisation=West Cumbria Rivers Trust
			\|Monitoring1 cost category=1 - 10 k€
	\|Monitoring Lead organisation=West Cumbria Rivers Trust		\|Monitoring Lead organisation=West Cumbria Rivers Trust
	}}		}}

WCRT at 15:21, 15 February 2019

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			\|Monitoring document=Durham Uni Archaeological Monitoring Report - July 2018.pdf
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			{{Case study monitoring documents
			\|Monitoring document=Ennerdale Mill Heritage Recording Initial Report.pdf
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	{{Additional Documents}}		{{Additional Documents}}

WCRT at 15:16, 15 February 2019

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 |Reach length directly affected=400
 |Project started=01/04/2017
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WCRT at 15:10, 15 February 2019

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	{{Project background		{{Project background
	\|~~Project started~~=~~2018/06/01~~		\|Reach length directly affected=400
	\|~~Works~~ started=~~2018~~/07/31		\|Project started=01/04/2017
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	{{Motivations		{{Motivations

WCRT at 15:08, 15 February 2019

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	A consortium of funders- WCRT, the Environment Agency, Natural England, the European Maritime and Fisheries Fund and James Fisher Nuclear- have combined resources to enable this weir removal project to take place over the summer of 2018. The project was delivered as part of the Cumbria River Restoration Strategy, a partnership between the EA, NE and WCRT.		A consortium of funders- WCRT, the Environment Agency, Natural England, the European Maritime and Fisheries Fund and James Fisher Nuclear- have combined resources to enable this weir removal project to take place over the summer of 2018. The project was delivered as part of the Cumbria River Restoration Strategy, a partnership between the EA, NE and WCRT.

	In June, we mobilized to site to begin the delicate task of removing the weir, without causing ecological damage through the uncontrolled release of silt and sediment into the river system. A specialized contractor, Ebsford Environmental, were chosen to deliver the works, ensuring silt control measures were installed downstream of the weir. In addition, prior to the works, WCRT and Natural England conducted a translocation of freshwater mussels from within the work site, re-locating 48 mussels upstream of Egremont.		In June 2018, we mobilized to site to begin the delicate task of removing the weir, without causing ecological damage through the uncontrolled release of silt and sediment into the river system. A specialized contractor, Ebsford Environmental, were chosen to deliver the works, ensuring silt control measures were installed downstream of the weir. In addition, prior to the works, WCRT and Natural England conducted a translocation of freshwater mussels from within the work site, re-locating 48 mussels upstream of Egremont.

	The working methodology, developed by WCRT and AECOM, involved river bank re-profiling, berm lowering, re-grading of the existing riverbed & installation of toe protection (boulders that reinforce the river bank to provide protection against erosion), all conducted in a specific order to minimise sediment disturbance. Once the preparation was complete (approx. 4 weeks) we were ready to ‘notch’ the weir which lowered the water levels upstream, allowing the sediment & gravels that had built up over decades to be removed in the dry. Removing the weir structure itself took one week, and throughout that process Durham University were conducting heritage recording of the site so that we have a historic record of the structure of the weir.		The working methodology, developed by WCRT and AECOM, involved river bank re-profiling, berm lowering, re-grading of the existing riverbed & installation of toe protection (boulders that reinforce the river bank to provide protection against erosion), all conducted in a specific order to minimise sediment disturbance. Once the preparation was complete (approx. 4 weeks) we were ready to ‘notch’ the weir which lowered the water levels upstream, allowing the sediment & gravels that had built up over decades to be removed in the dry. Removing the weir structure itself took one week, and throughout that process Durham University were conducting heritage recording of the site so that we have a historic record of the structure of the weir.
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	With the weir structure removed, the final tasks were to re-profile the riverbed and rapids upstream and downstream, and further strengthen the river banks with stone protection.		With the weir structure removed, the final tasks were to re-profile the riverbed and rapids upstream and downstream, and further strengthen the river banks with stone protection.

	Works completely finished on 31st July, meaning the whole project was delivered in around 7 weeks.		Works completely finished on 31st July 2018, meaning the whole project was delivered in around 7 weeks.

	The Rivers Trust and the Environment Agency, supported by other partners, have been working with the Marine Management Organisation and Defra to develop a coordinated and funded programme of projects for 2018/19 with the aim of freeing migration routes of barriers to fish.This project is part of that programme funded by over £1.6 million of European Maritime and Fisheries Funds, which is matched by more than £1 million of Agency/Defra funding and £300,000 of other funds.		The Rivers Trust and the Environment Agency, supported by other partners, have been working with the Marine Management Organisation and Defra to develop a coordinated and funded programme of projects for 2018/19 with the aim of freeing migration routes of barriers to fish.This project is part of that programme funded by over £1.6 million of European Maritime and Fisheries Funds, which is matched by more than £1 million of Agency/Defra funding and £300,000 of other funds.
			\|Monitoring surveys and results=Durham University undertook Archaeological Monitoring in 2017 and during the removal in 2018

			Immediately post-removal WCRT have been conducting regular fixed-point photography across the site, to highlight how the river adapts and responds to being re-naturalised.

			Drone-captured aerial imagery has also been recorded post-removal; once collated this can be contrasted with the footage captured pre-removal for before-and-after analysis
	\|Project title=Ennerdale Mill Weir Removal		\|Project title=Ennerdale Mill Weir Removal
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WCRT at 14:58, 15 February 2019

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			\|Subcatchment=River Ehen (lower)
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	{{Site		{{Site
	\|Name=River Ehen		\|Name=River Ehen

WCRT at 14:57, 15 February 2019

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	\|Name=River Ehen		\|Name=River Ehen
	\|Heavily modified water body=No		\|Heavily modified water body=No
	\|Protected species present=No		\|Protected species present=Yes
	\|Invasive species present=No		\|Invasive species present=No
			\|Species=Freshwater pearl mussel (Margaritifera margaritifera), Atlantic salmon (Salmo salar), Brown trout (Salmo trutta),
			\|Average bankfull channel width category=10 - 50 m
			\|Average bankfull channel depth category=0.5 - 2 m
	}}		}}
	{{Project background		{{Project background

WCRT at 14:52, 15 February 2019

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WCRT at 14:40, 15 February 2019

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	\|Contact organisation=West Cumbria Rivers Trust		\|Contact organisation=West Cumbria Rivers Trust
	\|Contact organisation url=www.westcumbriariverstrust.org		\|Contact organisation url=www.westcumbriariverstrust.org
			\|Partner organisations=Natural England & Environment Agency
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=EMD Before.png		\|Project picture=EMD Before.png
			\|Picture description=The weir at Ennerdale Mill, on the River Ehen in Egremont, prior to removal, showing significant damage to the structure and face of the weir
	\|Project summary=Ennerdale Mill Weir, located on the River Ehen in Egremont (Grid Ref NY 012099) dates back over 250 years and was constructed to power the Ennerdale Paper Mill. The Weir has not been used as it was intended for many years and has been proven to be a barrier to migratory species of fish in the Ehen catchment, as well as a crucial site for Freshwater Mussels.		\|Project summary=Ennerdale Mill Weir, located on the River Ehen in Egremont (Grid Ref NY 012099) dates back over 250 years and was constructed to power the Ennerdale Paper Mill. The Weir has not been used as it was intended for many years and has been proven to be a barrier to migratory species of fish in the Ehen catchment, as well as a crucial site for Freshwater Mussels.