Case study:Narborough Rehabilitation Project - Revision history

Ascarr at 16:47, 13 March 2025

2025-03-13T16:47:57Z

← Older revision		Revision as of 16:47, 13 March 2025
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			{{Location
			\|Location=52.68766, 0.57811
			}}
	{{Project overview		{{Project overview
	\|Status=Complete		\|Status=Complete
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	\|Approval status=Approved		\|Approval status=Approved
	}}		}}
	~~{{Location~~
	~~\|Location=52.68766041195301, 0.5781126022338867~~
	}}

	{{Image gallery}}		{{Image gallery}}

Ascarr at 16:47, 13 March 2025

2025-03-13T16:47:42Z

← Older revision		Revision as of 16:47, 13 March 2025
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	~~{{Case study status~~
	~~\|Approval status=Approved~~
	}}
	~~{{Location~~
	~~\|Location=52.68766041195301, 0.5781126022338867~~
	}}
	{{Project overview		{{Project overview
	\|Status=Complete		\|Status=Complete
	\|Themes=Habitat and biodiversity		\|Themes=Habitat and biodiversity, Hydromorphology, Peat
	\|Country=England		\|Country=England
	\|Main contact forename=Nigel T.H.		\|Main contact forename=Nigel T.H.
	\|Main contact surname=Holmes		\|Main contact surname=Holmes
	\|Partner organisations=Environment Agency, River Restoration Centre~~, Natural England,~~		\|Partner organisations=Environment Agency, Natural England, River Restoration Centre
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Nar.png		\|Project picture=Nar.png
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	\|Project summary=River excavations and modifications took three days, the majority of one of these being import of the gravel to the ‘runs’.		\|Project summary=River excavations and modifications took three days, the majority of one of these being import of the gravel to the ‘runs’.

	Work was implemented in c1km of river. There was absolutely no gradient within the sections modified, with the river being deep and sluggish throughout. Work carried out:		Work was implemented in c1km of river. There was absolutely no gradient within the sections modified, with the river being deep and sluggish throughout.

			Work carried out:
	**created greater diversity of habitat by modifying both the long and cross-sections;		**created greater diversity of habitat by modifying both the long and cross-sections;
	**locally narrowed the channel to improve self-cleansing of the bed in these locations, and accelerated flow into pools created immediately downstream;		**locally narrowed the channel to improve self-cleansing of the bed in these locations, and accelerated flow into pools created immediately downstream;
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	Where the bed was pure soft peat, the distinction between the narrowed channel upstream, and the deepened channel downstream, was much less. Had deflectors not already been present in the channel, it would have been difficult, or impossible, to establish narrowing upstream......the deflectors now form the downstream edges of the shoulders. Without reeds/sedge from adjacent to the river being added to these areas, they could not have been expected to be retained in the long term.		Where the bed was pure soft peat, the distinction between the narrowed channel upstream, and the deepened channel downstream, was much less. Had deflectors not already been present in the channel, it would have been difficult, or impossible, to establish narrowing upstream......the deflectors now form the downstream edges of the shoulders. Without reeds/sedge from adjacent to the river being added to these areas, they could not have been expected to be retained in the long term.
	}}		}}
			{{Case study status
			\|Approval status=Approved
			}}
			{{Location
			\|Location=52.68766041195301, 0.5781126022338867
			}}

	{{Image gallery}}		{{Image gallery}}
	{{Image gallery end}}		{{Image gallery end}}

Hazel Wilson at 14:33, 23 October 2015

2015-10-23T14:33:41Z

← Older revision		Revision as of 14:33, 23 October 2015
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	\|Name=Narborough		\|Name=Narborough
	\|WFD water body code=GB105033047791		\|WFD water body code=GB105033047791
			\|WFD water body name=Nar to confl with Blackborough Drain
	\|Pre-project morphology=Single channel, Straightened		\|Pre-project morphology=Single channel, Straightened
	\|Reference morphology=Single channel, Pool-riffle, Sinuous		\|Reference morphology=Single channel, Pool-riffle, Sinuous

JoshRRC at 15:02, 27 August 2015

2015-08-27T15:02:42Z

← Older revision		Revision as of 15:02, 27 August 2015
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	}}		}}
	{{Site		{{Site
	\|Name=Narborough		\|Name=Narborough
			\|WFD water body code=GB105033047791
	\|Pre-project morphology=Single channel, Straightened		\|Pre-project morphology=Single channel, Straightened
	\|Reference morphology=Single channel, Pool-riffle, Sinuous		\|Reference morphology=Single channel, Pool-riffle, Sinuous

NickRRC at 13:51, 18 October 2013

2013-10-18T13:51:14Z

← Older revision		Revision as of 13:51, 18 October 2013
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	{{Toggle content start}}		{{Toggle content start}}
	{{Case study subcatchment		{{Case study subcatchment
	\|Subcatchment=Nar		\|Subcatchment=Nar to confl with Blackborough Drain
	}}		}}
	{{Site		{{Site

Admin at 07:14, 6 September 2013

2013-09-06T07:14:32Z

← Older revision		Revision as of 07:14, 6 September 2013
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	Where the bed was pure soft peat, the distinction between the narrowed channel upstream, and the deepened channel downstream, was much less. Had deflectors not already been present in the channel, it would have been difficult, or impossible, to establish narrowing upstream......the deflectors now form the downstream edges of the shoulders. Without reeds/sedge from adjacent to the river being added to these areas, they could not have been expected to be retained in the long term.		Where the bed was pure soft peat, the distinction between the narrowed channel upstream, and the deepened channel downstream, was much less. Had deflectors not already been present in the channel, it would have been difficult, or impossible, to establish narrowing upstream......the deflectors now form the downstream edges of the shoulders. Without reeds/sedge from adjacent to the river being added to these areas, they could not have been expected to be retained in the long term.
	}}		}}
			{{Image gallery}}
			{{Image gallery end}}
			{{Toggle button}}
			{{Toggle content start}}
	{{Case study subcatchment		{{Case study subcatchment
	\|Subcatchment=Nar		\|Subcatchment=Nar
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	{{Monitoring documents}}		{{Monitoring documents}}
	{{Monitoring documents end}}		{{Monitoring documents end}}
	~~{{Image gallery}}~~
	~~{{Image gallery end}}~~
	{{Additional Documents}}		{{Additional Documents}}
	{{Case study documents		{{Case study documents
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	{{Additional links and references footer}}		{{Additional links and references footer}}
	{{Supplementary Information}}		{{Supplementary Information}}
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NickRRC at 15:54, 5 September 2013

2013-09-05T15:54:07Z

← Older revision		Revision as of 15:54, 5 September 2013
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	{{Case study status		{{Case study status
	\|Approval status=~~Draft~~		\|Approval status=Approved
	}}		}}
	{{Location		{{Location

Ascarr at 13:41, 17 May 2013

2013-05-17T13:41:51Z

← Older revision		Revision as of 13:41, 17 May 2013
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	\|Main contact forename=Nigel T.H.		\|Main contact forename=Nigel T.H.
	\|Main contact surname=Holmes		\|Main contact surname=Holmes
	\|Partner organisations=Environment Agency, River Restoration Centre, Natural England,		\|Partner organisations=Environment Agency, River Restoration Centre, Natural England,
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Nar.png		\|Project picture=Nar.png
	\|Picture description=just post works		\|Picture description=just post works
	\|Project summary=~~river~~ excavations and modifications took three days, the majority of one of these being import of the gravel to the ‘runs’.		\|Project summary=River excavations and modifications took three days, the majority of one of these being import of the gravel to the ‘runs’.

	Work was implemented in c1km of river. There was absolutely no gradient within the sections modified, with the river being deep and sluggish throughout. ~~In essence the work~~ carried out ~~was similar to that at Castle Acre, but on a very different, and even more degraded, channel morphology – i.e.~~:		Work was implemented in c1km of river. There was absolutely no gradient within the sections modified, with the river being deep and sluggish throughout. Work carried out:
	**created greater diversity of habitat by modifying both the long and cross-sections;		**created greater diversity of habitat by modifying both the long and cross-sections;
	**locally narrowed the channel to improve self-cleansing of the bed in these locations, and accelerated flow into pools created immediately downstream;		**locally narrowed the channel to improve self-cleansing of the bed in these locations, and accelerated flow into pools created immediately downstream;

Ascarr at 13:39, 17 May 2013

2013-05-17T13:39:55Z

← Older revision		Revision as of 13:39, 17 May 2013
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	\|Main contact forename=Nigel T.H.		\|Main contact forename=Nigel T.H.
	\|Main contact surname=Holmes		\|Main contact surname=Holmes
	\|Partner organisations=Environment Agency, River Restoration Centre,		\|Partner organisations=Environment Agency, River Restoration Centre, Natural England,
	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Nar.png		\|Project picture=Nar.png
			\|Picture description=just post works
			\|Project summary=river excavations and modifications took three days, the majority of one of these being import of the gravel to the ‘runs’.

			Work was implemented in c1km of river. There was absolutely no gradient within the sections modified, with the river being deep and sluggish throughout. In essence the work carried out was similar to that at Castle Acre, but on a very different, and even more degraded, channel morphology – i.e.:
			**created greater diversity of habitat by modifying both the long and cross-sections;
			**locally narrowed the channel to improve self-cleansing of the bed in these locations, and accelerated flow into pools created immediately downstream;
			**removed the unsightly deflectors by replacing them with ‘living’ features that already are doing a much more effective job than the deflectors were attempting to do;
			**the one main difference from the Castle Acre stretch was that some of the upstream ‘runs’ had a thin layer of gravel spread over them too.

			Differences in character were primarily determined by the character of the river bed where pools were excavated, and the extent of reed/sedge available from adjacent to the river to add to the channel.

			Where the bed was hard, and reed/sedge was plentiful, upstream narrowing could be more extensive. In all cases where the bed was hard (predominantly chalky clay), very distinct pools and upstream ‘runs’ were formed. Where-ever possible the bed of the narrowed channel upstream of the pools was shallowed by adding material dug from the pools – this could only be done where flints or firm clay formed the substrate.

			Where the bed was pure soft peat, the distinction between the narrowed channel upstream, and the deepened channel downstream, was much less. Had deflectors not already been present in the channel, it would have been difficult, or impossible, to establish narrowing upstream......the deflectors now form the downstream edges of the shoulders. Without reeds/sedge from adjacent to the river being added to these areas, they could not have been expected to be retained in the long term.
	}}		}}
	{{Case study subcatchment		{{Case study subcatchment

Ascarr at 13:18, 17 May 2013

2013-05-17T13:18:52Z

← Older revision		Revision as of 13:18, 17 May 2013
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	{{Image gallery end}}		{{Image gallery end}}
	{{Additional Documents}}		{{Additional Documents}}
			{{Case study documents
			\|File name=NAR Spring 2011 - as built project report.pdf
			\|Description=River Nar Rehabilitation summary by Nigel Holmes
			}}
	{{Additional Documents end}}		{{Additional Documents end}}
	{{Additional links and references header}}		{{Additional links and references header}}
	{{Additional links and references footer}}		{{Additional links and references footer}}
	{{Supplementary Information}}		{{Supplementary Information}}