Case study:Burn of Mosset, Forres

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Location: 57° 35' 43.20" N, 3° 35' 30.93" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology
Country	Scotland
Main contact forename	Matthew
Main contact surname	Hardwick
Main contact user ID
Contact organisation	Royal HaskoningDHV
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Burn of Mosset is a small gravel bed stream draining an area of 49km2. A Tributary of the River Findhorn, it flows north through the town of Forres before entering Findhorn bay. The town of Forres has a long history of flooding from the burn, with six flood events causing serious damage to property or disruption in the last fifty years. The new Flood Alleviation Scheme (FAS) took two years to complete. It included the construction of an earth-filled embankment dam designed to allow for discharges up to 8.5 m3/s to flow through Forres, with excess floodwater temporarily stored behind the dam. In addition to this, the upstream storage area has been designed to create an extensive natural sediment accretion zone (for sand, gravel and large wood). This will reduce the risk of sediment or other debris blocking the dam control structure. The scheme also aimed to create a mosaic of river and floodplain habitats, by working with natural processes to develop a multi-thread (anabranched) system. This was achieved by breaching the existing embanked channel which ran around a field boundary at two points, allowing flow to spill out across the open field, before re-joining the original channel just upstream of the dam. Tress were planted across the site to create a wet woodland habitat. Since construction in 2008 the scheme is effectively storing large wood and sediment, with a large sediment outwash fan forming at the upstream breach. A small amount of adaptive management has been required at the upstream breach due to erosional events interacting with woody material in the channel. Measures were taken to ensure that a further breach of the old channel did not occur, as this could have led to flooding of a significant area of agricultural land. In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.

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Catchment and subcatchment

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Catchment

River basin district	Scotland RBD
River basin	Findhorn

Subcatchment

River name	Burn of Mosset
Area category
Area (km2)	13001,300 km² <br />130,000 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology	Organic
Ecoregion	Great Britain
Dominant land cover	Moorland/heathland, Woodland
Waterbody ID

Site

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Name	Forres Flood Alleviation Scheme
WFD water body codes	23021
WFD (national) typology	Lowland, Small, Siliceous
WFD water body name	Mosset Burn Altyre to Forres
Pre-project morphology	Straightened, Embanked, Over-widened
Reference morphology	Anastomosing, Pool-riffle
Desired post project morphology
Heavily modified water body	No
National/international site designation
Local/regional site designations
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology	Quick run-off
Dominant substrate	Gravel, Cobble
River corridor land use	Improved/semi-improved grassland/pasture, Moorland/heathland, Woodland
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)	500500 m <br />0.5 km <br />50,000 cm <br />
Project started	2008/01/01
Works started
Works completed
Project completed	2008/12/31
Total cost category
Total cost (k€)	116116 k€ <br />116,000 € <br />
Benefit to cost ratio
Funding sources

Cost for project phases

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Investigation and design
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Reasons for river restoration

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Mitigation of a pressure
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Measures

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Monitoring

Hydromorphological quality elements

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Supplementary Information

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