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, Cairngorms 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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Image gallery

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Before - artificial embankment

After - lowered embankment

Before - Cross channel boulders

After - Wood Structure

Before - Upstream Left bank bar

After - Upstream left bank bar

Before - Large floodplain ditch

After - Floodplain ditch infilled

Downstream view post works

Downstream view during first flood event

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Scotland RBD River basin River Spey Subcatchment River name River Avon Area category 100 - 1000 km² Area (km2) 545545 km² <br />54,500 ha <br /> Maximum altitude category 500 - 1000 m Maximum altitude (m) 700700 m <br />0.7 km <br />70,000 cm <br /> Dominant geology granite, sedimentary, metamorphosed sedimentary Ecoregion Great Britain Dominant land cover Moorland, agriculture, forestry Waterbody ID 23084 Other case studies in this subcatchment: River Avon Our Water Environment Site Edit site 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 Edit project background Reach length directly affected (m) 600600 m <br />0.6 km <br />60,000 cm <br /> Project started 2012/03/01 Works started 2012/09/17 Works completed 2012/09/24 Project completed Total cost category 10 - 50 k€ Total cost (k€) Benefit to cost ratio Funding sources SEPA Restoration fund, CNPA Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 1 - 10 k€ CBec Eco Engineering Dr H Moir Stakeholder engagement and communication Less than 1 k€ Spey Catchment Initiative Liz Henderson Works and works supervision 1 - 10 k€ Allan Munro Construction /Spey District Fishery Board Post-project management and maintenance 1 - 10 k€ Spey Catchment Initiative Liz Henderson Monitoring 1 - 10 k€ tbc Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood risk management Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Removal of in stream boulders and replacement with wood structures. Additional strategic wood structures introduced. Graded extracted gravel to be used for sediment reintroduction, Lowering of embankments Floodplain / River corridor Removal of 3 culvert pipes. Infilling of a large drainage ditch. Planform / Channel pattern Other Site fenced to enable natural regeneration to take place. Supplementary planting planned for Spring 2013. Long term site monitoring programmed planned. Non-structural measures Management interventions Social measures (incl. engagement) Other Demonstration site for natural flood management techniques 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 Supplementary Information Edit Supplementary Information