Case study:Allt Lorgy River Restoration

From RESTORE
Jump to: navigation, search
0.00
(0 votes)


To discuss or comment on this case study, please use the discussion page.


Location: 57° 16' 18", -3° 50' 33"
Edit location
Loading map...
Left click to look around in the map, and use the wheel of your mouse to zoom in and out.


Project overview

Edit project overview
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

Edit project overview to modify the project summary.


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

This case study hasn’t got any Monitoring survey and results, you can add some by editing the project overview.

Lessons learnt

This case study hasn’t got any lessons learnt, you can add some by editing the project overview.


Image gallery


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
ShowHideAdditionalImage.png


Catchment and subcatchment

Catchment

River basin district Scotland RBD
River basin

Subcatchment

River name River Spey
Area category 1000 - 10000 km²
Area (km2)
Maximum altitude category 1000 - 2000 m
Maximum altitude (m)
Dominant geology
Ecoregion
Dominant land cover
Waterbody ID



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

Reach length directly affected (m) 600
600 m
0.6 km
60,000 cm
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 CNPA, Scottish Environment Protection Agency

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

Mitigation of a pressure Flood risk management
Hydromorphology Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project


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

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

Supplementary Information

Edit Supplementary Information