Case study:Levington Saltmarsh Restoration, Suffolk

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Location: 51° 59' 41.32" N, 1° 16' 33.79" E

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Project overview

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Status	Complete
Project web site	http://www.therrc.co.uk/sites/default/files/projects/56_levington.pdf
Themes	Flood risk management, Habitat and biodiversity, Water quality
Country	England
Main contact forename	Jonathan
Main contact surname	Dyke
Main contact user ID
Contact organisation	Suffolk Yacht Harbour
Contact organisation web site	http://www.syharbour.co.uk/
Partner organisations	Levington Marina, Ipswich Borough Council, Suffolk Coast and Heaths AONB Unit, Environment Agency, Natural England, Suffolk Wildlife Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

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Levington Marina (Map 1) on the River Orwell in Suffolk is dredged each winter using a 10-foot cutter suction dredger to maintain water depths around the pontoons and berths. Since 2014, dredged material has been deposited in 2 beneficial placement schemes licensed by Defra and approved by Natural England. Each year 15,000–20,000m3 of silt is dredged and placed on the foreshore. Operations are carried out between mid-November and early April. A Marine Management Organisation (MMO) licence is held by Suffolk Yacht Harbour for beneficial foreshore disposal. Dredged material is recovered as a slurry and conveyed by one of two fixed pipes to a deposition area east and west of the harbour where saltmarsh has been degraded and fragmented. The ends of the fixed pipes are moved each year to vary the location in which dredged material is discharged. Photo 1 shows the Levington Lagoon. Coir rolls and wooden stakes have been introduced into the deposition areas to contribute to: • retaining discharged material in place • impede flow • make it easier to deposit sediment during the dredging operation Significant accretion of between 100mm and 300mm has been noted during the 3 years of monitoring. It is anticipated that this will translate into more robust growth of pioneer saltmarsh vegetation and in due course colonisation by high saltmarsh vegetation.

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Catchment and subcatchment Select a catchment/subcatchment 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) Project started 1997 Works started Works completed Project completed Total cost category Total cost (k€) £61,000"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Levington Marina, Partnership contributions 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 Flood and coastal erosion protection Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Salt marsh and mudflat restoration 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