Case study:Tall River

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Location: 54° 26' 21.93" N, 6° 35' 14.76" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Judith
Main contact surname	Bankhead
Main contact user ID
Contact organisation	Rivers Agency, Northern Ireland (DARDNI)
Contact organisation web site	http://www.dardni.gov.uk/index/rivers.htm
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Bay and stone cascade - 2006

Project summary

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The Tall River is a main tributary of the River Blackwater, flowing through Co. Armagh. It is a slow flowing, low energy river within an agricultural catchment. The river had been subject to an arterial drainage scheme in the 1960s, which deepened and widened the river as well as disconnecting it from its floodplain. The 1.2km Tall River scheme was the first project within Northern Ireland to address the specific need to enhance the riverine environment, rather than being attached to a larger flood prevention scheme. Works could only be carried out in-channel and on the National Trust owned right bank due to landowner restrictions. The aim of the protect was to create shallow slack-water habitat through the creation of bays. These would provide shelter for fish fry and invertebrates during high flows and aimed to increase macrophyte diversity within the reach. Stone cascades were also installed to direct flow away from potentially erodable banks. A repeat RCS carried out two years post works indicated an increase in emergent vegetation and macrophyte diversity. The bays are inundated at high flows, acting as a fish refuge, however due to siltation these may be becoming too shallow. Following the creation of stone cascades greater flow variation has been ovserved. The success of the bays appears to depend on the presence, or otherwise, of a structure deflecting water into them. If the project was to be carried out again more consideration should be given to the location of the bays within the overall flow regime or alternatively structures that would maintain flows into the bay should be included in the design.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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Name	Tall River
WFD water body codes	10611
WFD (national) typology
WFD water body name
Pre-project morphology	Over deepened, Over-widened channel as a result of arterial drainage
Reference morphology	Narrower, Sinuous channel with shallow margins
Desired post project morphology
Heavily modified water body	No
National/international site designation
Local/regional site designations
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology
Dominant substrate	Clay
River corridor land use	Agriculture (arable)
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	12001,200 m <br />1.2 km <br />120,000 cm <br />
Project started	2013/07/01
Works started
Works completed
Project completed	1996/12/01
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring

Supplementary funding information

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Reasons for river restoration

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Mitigation of a pressure	Habitat creation, fisheries, floodplain reconnection
Hydromorphology	Flow dynamics
Biology	Fish, Invertebrates, Macrophytes
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Creation of four bays on right hand bank
Floodplain / River corridor	Connection to wider floodplain
Planform / Channel pattern	Creation of slack water areas
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)	Part of a wider scheme developing footpath access along the river
Other

Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Macrophytes	Yes	Yes	Yes	Yes	No	Improvement
Fish	No	Yes	No	Yes	No	Improvement

Physico-chemical quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Any other monitoring, e.g. social, economic

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Additional links and references

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Supplementary Information

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