Case study:Levington Saltmarsh Restoration, Suffolk

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Location: 51° 59' 41", 1° 16' 34"
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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
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encompassing the following
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Project summary

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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



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)
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

Mitigation of a pressure Flood and coastal erosion protection
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


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

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
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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



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Additional links and references

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Supplementary Information

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