Case study:Lodge Burn Flood Alleviation Scheme

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Location: 55° 8' 2", -6° 40' 11"
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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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Lessons learnt

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Image gallery


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).
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Catchment and subcatchment

Catchment

River basin district Northern Ireland
River basin Bann

Subcatchment

River name Lodge Burn
Area category 10 - 100 km²
Area (km2) 16.41
16.41 km²
1,641 ha
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

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

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€) 1550000
1,550,000 k€
1,550,000,000 €
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

Mitigation of a pressure Flood mitigation
Hydromorphology
Biology Habitat enhancement
Physico-chemical
Other reasons for the project


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

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://www.lodgeburn.com/Photo Gallery.html Project Photographs

Supplementary Information

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