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, 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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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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

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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

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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

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

Measures

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Structural measures
Bank/bed modifications	Culvert replacement/repair, silt-trapping weir installation, rock ramp pool and fish pass construction, vegetated riverbanks within flood wall (habitat enhancement).
Floodplain / River corridor	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

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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
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Physico-chemical quality elements

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quality elements

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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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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).

Additional documents and videos

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Additional links and references

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Link	Description
http://www.lodgeburn.com/Photo Gallery.html	Project Photographs

Supplementary Information

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