Case study:Allt Lorgy River Restoration

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Location: 57° 16' 18.18" N, 3° 50' 33.26" W

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Project overview

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Status	In progress
Project web site
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring
Country	Scotland
Main contact forename	Liz
Main contact surname	Henderson
Main contact user ID
Contact organisation	Spey Catchment Initiative
Contact organisation web site	http://speyfisheryboard.com
Partner organisations	Spey Fishery Board, Cairngorm National Park Authority, Scottish Natural Heritage, SEPA
Parent multi-site project
This is a parent project encompassing the following projects	No

Straightened section of the Allt Lorgy Burn

Project summary

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This project aims to restore the morphology and habitat of a 600m section of moderately high energy river and its floodplain by removing significant artificial constraints (man made embankments and boulders. Over the years these have canalised the water course from a multi braided to a single channel. By kick starting the process the intention is that over time the watercourse will do its own work to re-establish a natural equilibrium. In September 2012, five artificial embankments were lowered by the removal of over 900m3 of material. In stream boulders were removed and replaced with large wood structures. Additional wood structures were introduced in key locations and some of the extracted gravel was graded and stockpiled ready to be used for sediment reintoduction. Culvert pipes were removed from the floodplain and one large drainage ditch was in filled.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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Name
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
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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Project started
Works started
Works completed
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Total cost (k€)
Benefit to cost ratio
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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

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Mitigation of a pressure	Removal of artificial constraints (embankments and boulders) to restore morphology and habitat of a multi braided watercourse that had been canalised into a single channel.
Hydromorphology
Biology
Physico-chemical
Other reasons for the project	Demonstrate and monitor natural flood management techniques in the catchment

Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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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

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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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Additional links and references

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Supplementary Information

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