Case study:Malltraeth Marsh

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Location: 53° 12' 53.43" N, 4° 19' 42.23" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	Wales
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Wetland and open water restoration, Malltraeth Marsh.

Project summary

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The channel was canalised, embanked, and virtually featureless carrying highland water from upstream across a flat lowland valley. Marsh either side is grazing land designated as SSSI. Aims of the project: • To restore the open water characteristics of remnant cut-off channels of the Cefni that were being to be lost through drying and reed/rush/sweet-grass invasion. • Combined with local restoration of high water tables, these measures ensured that the wildlife interests which gave rise to its notification as an SSSI are maintained and enhanced. Works carried out: • excavation of drying relic meanders and other open water areas • sluices on drains/ditches to raise water levels in summer • sluices and/or bunds to raise winter water levels • willow/scrub control and other vegetation management • improved bank profiles to the many ditches that traverse the floodplain

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Site Edit site Name Malltraeth Marsh WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Embanked, Straightened Reference morphology Wetland marsh Desired post project morphology Heavily modified water body No National/international site designation UK - Site of Special Scientific Interest Local/regional site designations Special Area of Conservation Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Wetland, Rough unimproved grassland/pasture 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) 70007,000 m <br />7 km <br />700,000 cm <br /> Project started 1993 Works started Works completed Project completed 1996/01/01 Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Edit reasons for restoration Mitigation of a pressure Impoundments (not hydropower) Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications excavation of historic channels, increase bed levels Floodplain / River corridor Creation of wetlands, reinstate floodplain Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other 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