Case study:Lodge Burn Flood Alleviation Scheme

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Location: 55° 8' 1.57" N, 6° 40' 11.08" W

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Project overview

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Status	Complete
Project web site	http://www.lodgeburn.com
Themes	Flood risk management
Country	Northern Ireland
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID	User:NickRRC
Contact organisation	River Restoration Centre
Contact organisation web site
Partner organisations	Atkins, Rivers Agency Northern Ireland (DARDNI), McLauchlin & Harvey
Parent multi-site project
This is a parent project encompassing the following projects	No

Restored channel in Anderson Park - site of former pond. Channel constrained by hidden gabion baskets to restrict lateral migration. Courtesy of Gareth Greer - Rivers Agency (Northern Ireland).

Project summary

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Reports found that sections of the Lodge Burn through Coleraine flooded on a regular basis, particularly in Anderson Park and downstream of Millburn Road. A feasibility study was undertaken by Atkins to identify potential solutions to the flooding issue, which determined that a staged approach would be best for the implementation of flood alleviation works.

Phase 1 included the implementation of measures for flood alleviation through river channel improvements, to minimise flooding to a 1 in 100 year event.

WORKS:

1. Replacement culvert constructed, with floor embedded to upstream bed level. Low flow channel through culvert, to allow fish passage during low-flow periods.

2. In-situ improvement to old masonry culvert - aligned with replacement culvert upstream to improve flow conditions.

3. Flood wall construction between Railway Road Bridge and Brook Street Bridge.

4. New vegetated riverbanks alongside floodwall, for habitat enhancement. Rock ramp pool and weir fish pass constructed at outfall of Railway Road Bridge. New spawning areas created using existing bed material, boulders and gravels.

5. Removal of Anderson Park pond to restore natural course of river, facilitate free fish passage and allow for natural sediment transport to be restored.

6. Diversion of large water main and supporting beam, which has been obstructing flow.

Vegetated riverbanks within flood wall (habitat enhancement).

Monitoring surveys and results

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Image gallery

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Channel restoration in Anderson park during works. Gabion baskets installed to constrain lateral channel migration. Courtesy of Gareth Greer - Rivers Agency (Northern Ireland). See main project photo for post-restoration channel.

Channel restoration in Anderson park prior to revegetation of banks. Courtesy of Rivers Agency (Northern Ireland). See main project photo for post-restoration channel.

Channel restoration through Anderson Park, post-restoration. New channel and banks well established. Courtesy of Rivers Agency (Northern Ireland).

Flood wall during construction. Courtesy of Rivers Agency (Northern Ireland).

Rock ramp installed at outfall of Railway Road Bridge, for easement of fish passage. Courtesy of Rivers Agency (Northern Ireland).

Rock ramp for easement of fish passage upstream - upon completion. Courtesy of Rivers Agency (Northern Ireland).

Leisure Centre culvert in construction. Courtesy of Rivers Agency (Northern Ireland).

Leisure Centre culvert outlet - upon completion. Courtesy of Rivers Agency (Northern Ireland).

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Northern Ireland River basin Bann Subcatchment River name Lodge Burn Area category 10 - 100 km² Area (km2) 16.4116.41 km² <br />1,641 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Ireland and Northern Ireland Dominant land cover Agriculture Waterbody ID Other case studies in this subcatchment: Lodge Burn cascade fish pass and culvert bed restoration (as part of the Lodge Burn FAS) Site Edit site Name Lodge Burn at Coleraine WFD water body codes Unknown WFD (national) typology Unknown WFD water body name Unknown Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes 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 Edit project background Reach length directly affected (m) Project started 2008/09/01 Works started 2011/01/31 Works completed 2012/06/01 Project completed 2012/07/01 Total cost category more than 10000 k€ Total cost (k€) 15500001,550,000 k€ <br />1,550,000,000 € <br /> Benefit to cost ratio Funding sources Department for Agriculture and Rural Development - Rivers Agency Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Atkins Julie Templeton Stakeholder engagement and communication Department of Agriculture & Rural Development Rivers Agency Alex Bailie Works and works supervision McLauchlin & Harvey Joe McElduff Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood mitigation Hydromorphology Biology Habitat enhancement Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Culvert replacement/repair, silt-trapping weir installation, habitat improvements, Rock ramp construction, Creation of fish passes Floodplain / River corridor Construction of flood wall Planform / Channel pattern Removal of pond to restore natural course and sediment transport. Other Diversion of water main and supporting beam - obstruction to flow. Non-structural measures Management interventions Social measures (incl. engagement) 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 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.lodgeburn.com/Photo Gallery.html Project Photographs Supplementary Information Edit Supplementary Information