Case study:Chowder Ness Managed Realignment Scheme - Revision history

Hazel Wilson at 09:11, 27 October 2015

2015-10-27T09:11:32Z

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	{{Site		{{Site
	\|Name=Inner Humber Estuary North, Lincolnshire		\|Name=Inner Humber Estuary North, Lincolnshire
			\|WFD water body code=GB104029067620
			\|WFD water body name=Barton Blow wells drainage
	\|Heavily modified water body=No		\|Heavily modified water body=No
	\|Protected species present=No		\|Protected species present=No

NickRRC at 15:15, 18 October 2013

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	\|Approval status=~~Draft~~		\|Approval status=Approved
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NickRRC at 15:15, 18 October 2013

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			\|Subcatchment=Barton Blow wells drainage
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	\|Name=Inner Humber Estuary North, Lincolnshire		\|Name=Inner Humber Estuary North, Lincolnshire

Ascarr at 14:31, 1 October 2013

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	{{Location		{{Location
	\|Location=52.~~92798807012085~~, 0.~~47529602888971567~~		\|Location=53.6913195418972, -0.4815101623535156
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	{{Project overview		{{Project overview

Ascarr at 14:26, 1 October 2013

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	\|Information=*Creation and restoration of coastal and estuarine habitats A review of practical examples and a description of sequential guidelines for habitat creation and restoration in port areas (2007) S. Bracke, T. Bucx, N. Frost, H. Jaspers, J. de Groot, G. Quemeneur, F. Sahin, P. Slim, H. Slootweg, H. Smit, E. de Swart, T. Tessier, L. Vermeersch, T. Vanoutrive. New Delta		\|Information=*Creation and restoration of coastal and estuarine habitats A review of practical examples and a description of sequential guidelines for habitat creation and restoration in port areas (2007) S. Bracke, T. Bucx, N. Frost, H. Jaspers, J. de Groot, G. Quemeneur, F. Sahin, P. Slim, H. Slootweg, H. Smit, E. de Swart, T. Tessier, L. Vermeersch, T. Vanoutrive. New Delta
	*Environmental Statement for a Managed Realignment Scheme at Chowder Ness. Report No. R.979. (2004). ABPmer		*Environmental Statement for a Managed Realignment Scheme at Chowder Ness. Report No. R.979. (2004). ABPmer
	~~•Environmental Statement for a Managed Realignment Scheme at Welwick. Report No. R.980. (2004). ABPmer~~
	*Managed Realignment in the Humber Estuary, UK. (2008). Hemingway, K.L., Cutts, N.C. & R. Pérez-Dominguez., Institute of Estuarine & Coastal Studies (IECS), University of Hull, UK.		*Managed Realignment in the Humber Estuary, UK. (2008). Hemingway, K.L., Cutts, N.C. & R. Pérez-Dominguez., Institute of Estuarine & Coastal Studies (IECS), University of Hull, UK.
	*Potential for sustainable habitat creation in the Humber Estuary. Environment Agency Humber estuary shoreline management plan habitat migration study. (2000) Binnie Black and Veatch		*Potential for sustainable habitat creation in the Humber Estuary. Environment Agency Humber estuary shoreline management plan habitat migration study. (2000) Binnie Black and Veatch
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	*www.harbasins.org		*www.harbasins.org
	*www.humberems.co.uk		*www.humberems.co.uk

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Ascarr at 14:25, 1 October 2013

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Ascarr at 14:24, 1 October 2013

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			{{Additional links and references
			\|Link=ec.europa.eu/ourcoast/download.cfm?fileID=862
			\|Description=creation and restoartion of coastal and estuarine habitats
			}}
			{{Additional links and references
			\|Link=ec.europa.eu/ourcoast/download.cfm?fileID=861
			\|Description=a managed realignment in the Humber estuary
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	{{Additional links and references		{{Additional links and references
	\|Link=greenporthull.co.uk/environmental/		\|Link=greenporthull.co.uk/environmental/
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	{{Additional links and references		{{Additional links and references
	\|Link=ec.europa.eu/ourcoast/index.cfm?menuID=7&articleID=50		\|Link=ec.europa.eu/ourcoast/index.cfm?menuID=7&articleID=50
	\|Description=Habitat creation as compensation for port development in Natura 2000 areas of the Humber estuary - UK		\|Description=Habitat creation as compensation for port development in Natura 2000 areas of the Humber estuary - UK
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	{{Additional links and references		{{Additional links and references

Ascarr at 14:22, 1 October 2013

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	\|River corridor land use=Arable		\|River corridor land use=Arable
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	{{Project background}}		{{Project background
			\|Reach length directly affected=570
			\|Works started=2005/02/01
			\|Works completed=2006/07/03
			\|Total cost category=1000 - 5000 k€
			\|Total1 cost=1500
			\|Funding sources=ABP,
			\|Supplementary funding information=A new Roll-on Roll-off terminal was constructed by Associated British Ports (ABP) at Immingham harbour in 2006 on the south bank of the Humber estuary. It resulted in the direct loss of 22 ha of intertidal mudflat and potentially up to 5 ha of indirect losses in the estuary proposed Special Protection Area (now an SPA) and possible Special Area of Conservation (now a candidate SAC). In consultation with regulatory bodies and local nature conservation interest groups, two managed realignment schemes at Chowder Ness and Welwick were identified as contributing to a compensation package for the impact of constructing the new harbour.


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Ascarr at 14:11, 1 October 2013

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	The old defence was removed in a series of stages: (1) removing the rear of the embankment, (2) the concrete wave return, the bitumen and rock face, and (3) the overall lowering of the embankment (to levels around 1.6 to 2mODN).		The old defence was removed in a series of stages: (1) removing the rear of the embankment, (2) the concrete wave return, the bitumen and rock face, and (3) the overall lowering of the embankment (to levels around 1.6 to 2mODN).
	\|Monitoring surveys and results=A ten-year monitoring programme is being is being undertaken to describe both changes to sites fronting the realignment (in relation to bathymetry, invertebrates and waterfowl), and to the realignment site itself (in relation to topography, saltmarsh composition, changes to intertidal invertebrates and bird and wildfowl usage).		\|Monitoring surveys and results=A ten-year monitoring programme is being is being undertaken to describe both changes to sites fronting the realignment (in relation to bathymetry, invertebrates and waterfowl), and to the realignment site itself (in relation to topography, saltmarsh composition, changes to intertidal invertebrates and bird and wildfowl usage).

			Over 12 ha of mudflat were created. During 2006/2007, a total of 13 waterbird species were found to be using the newly created intertidal area. All target species established for the site were observed with one exception. Although the grassland and hedgerow are relatively new habitats six bird species were observed using the grassland of the newly created embankment during 2007, four of which held breeding territories. Again, all target species were observed with one exception. Welwick: The site covers a total area of 54 ha to the edge of the current saltmarsh in front of the seawall. Landward of the current defences the site area covers approximately 48ha, whilst the current sea defence accounts for 3 ha and saltmarsh in front of this covers 3 ha. A total of 29 waterbird species have been recorded with the realignment site having developed as a major roosting site for a number of wading birds at high water. With one exception, all target species established for the site have been observed.

			In total, 66 ha. of farmland have been converted into new inter-tidal habitat to compensate for the 22 ha. of land lost due to the new port developments.

			At a very early stage, an integrated plan, considering flood protection, nature protection and maritime transport including mitigation measures, was developed. When the plans were first put forward, there was strong resistance because of the habitat loss. Through extensive consultation and close co-operation with a number of environmental organisations, an outcome was reached that was acceptable to all parties. The process ensured that the environmental impact of the project was clearly identified and mitigation and compensation actions taken. This led to a legally binding agreement – the first of its kind in the UK – that meant that ABP had to carry out the agreed set of offsetting measures but that they would not have to face a lengthy and costly public enquiry.


	\|Lessons learn=Accretion: In order for the site to support both mudflat invertebrates and saltmarsh plants, it was important that fine marine sediments would be imported into the site, as these would provide the ideal environment for intertidal flora and fauna. Furthermore such sediment import would ensure that the site would continue to increase in elevation as sea levels rise. Observations from previous managed realignments have shown that sites can accrete relatively rapidly immediately after a breach, but that elevation increases then tend to level off. At Chowder Ness, site elevation monitoring has so far followed a similar trajectory. To date, overall, the site has increased in elevation with the main change in elevation occurring in the initial two years following the realignment.		\|Lessons learn=Accretion: In order for the site to support both mudflat invertebrates and saltmarsh plants, it was important that fine marine sediments would be imported into the site, as these would provide the ideal environment for intertidal flora and fauna. Furthermore such sediment import would ensure that the site would continue to increase in elevation as sea levels rise. Observations from previous managed realignments have shown that sites can accrete relatively rapidly immediately after a breach, but that elevation increases then tend to level off. At Chowder Ness, site elevation monitoring has so far followed a similar trajectory. To date, overall, the site has increased in elevation with the main change in elevation occurring in the initial two years following the realignment.

Ascarr at 14:10, 1 October 2013

2013-10-01T14:10:28Z

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	\|Link=greenporthull.co.uk/environmental/		\|Link=greenporthull.co.uk/environmental/
	\|Description=Green Port Hull		\|Description=Green Port Hull
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			{{Additional links and references
			\|Link=ec.europa.eu/ourcoast/index.cfm?menuID=7&articleID=50
			\|Description=Habitat creation as compensation for port development in Natura 2000 areas of the Humber estuary - UK
	}}		}}
	{{Additional links and references		{{Additional links and references