Case study:Emergency works after breach on Lough Neas Drain (Cloghcor)

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Location: 54° 53' 5", -7° 24' 11"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Flood risk management
Country Northern Ireland
Main contact forename Gareth
Main contact surname Greer
Main contact user ID
Contact organisation Department of Agriculture and Rural Development
Contact organisation web site http://www.dardni.gov.uk/riversagency/
Partner organisations Rivers Agency Northern Ireland (DARDNI), Loughs Agency
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Project picture

Project summary

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Flood risk concerns and the likelihood of misconnections increased following a sudden change in the course of a perched stream in Lough Neagh (Northern Ireland) due to a heavy rainfall episode. An emergency plan for stream restoration was quickly drawn up by the Rivers Agency in consultation with local fisheries staff.

During four days works aimed to rebuild the breached bank and to connect the channel with the main rivers. A combination of bed raising and lowering in order to connect the channel also addressed the extent of channel incision. Flows were diverted into a quarry lagoon to prevent further flooding and allow channel re-grading works. Further action required filling the breach and restoring the channel with establishment of rock groynes to reduce flow velocity, prevent further incision and increase fish habitat. Follow-up enhancement works included the removal of a downstream flap valve and associated pipes (where the stream entered the Burndennet River) as well as the addition of step pools to help fish ascend through the perched culvert.

The River Restoration Centre would like to thank Gareth Geer from the Department of Agriculture and Rural Development for providing the information and pictures for this case study.

Monitoring surveys and results

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Lessons learnt

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Image gallery


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Catchment and subcatchment

Catchment

River basin district Northern Ireland North West
River basin Foyle

Subcatchment

River name
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion
Dominant land cover
Waterbody ID



Site

Name
WFD water body codes
WFD (national) typology
WFD water body name Lough Neas
Pre-project morphology
Reference morphology
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
River corridor land use
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

Reach length directly affected (m)
Project started
Works started 2011/10/27
Works completed 2011/10/30
Project completed
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



Reasons for river restoration

Mitigation of a pressure Flood risk management, Flood protection maintenance works
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Bed raising, rock groynes, Channel reprofiling, Creation of pools and riffles
Floodplain / River corridor
Planform / Channel pattern
Other Removal of a flap valve
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

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

Biological quality elements

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

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

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


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://therrc.co.uk/Bulletin/Oct2012/Lough Neas.pdf River Restoration Centre (2012) Lough Neas Emergency works: RRC Olympic Challenge - Hurdles winner

Supplementary Information

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