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	Northern Ireland
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 2 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.

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Image gallery

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Downstream bays after two years - 1998

Bay 2, heavily vegetated - 2012

Catchment and subcatchment Select a catchment/subcatchment Site Edit site 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 Edit project background 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 Information about cost of scheme not available Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Habitat creation, fisheries, floodplain reconnection Hydromorphology Flow dynamics Biology Fish, Invertebrates, Macrophytes Physico-chemical Other reasons for the project Measures Edit Measures 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological 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 Edit Physico-chemical 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://www.therrc.co.uk/mot/Tall 3.8 25Apr2013 Av.pdf RRC Manual of River Restoration Techniques entry Supplementary Information Edit Supplementary Information