Dredging

Cost effective, environmentally sound water injection dredging

Our fleet of water injection dredgers are able to work in a wide range of settings, including ports, harbours, navigation channels and marinas to remove siltation build up. Our experienced team are creative problem solvers who are able to finesse our dredging strategy to suite a wide variety of locations and situations. We also have a cutter sucker dredger for use with heavier sands and sediments.

Benefits

  • Cost effective method of dredging
  • No disposal licence required
  • Smaller vessels are fully road transportable
  • Quick mobilisation/demobilisation times
  • No need to move pontoons or infrastructure with our smaller vessels
  • Shorter timeframes for carrying out work
  • Great manoeuvrability
  • Able to reach hard to reach areas close to embankments and quay walls
  • Environmentally sound solution
  • Creates a considerably lower CO2 footprint compared with conventional dredging

Uses of Water Injection Dredging

  • Marinas
  • Underneath jetties and moored vessels
  • Alongside quay walls
  • In locks
  • Inland waterways/canals
  • Culverts
  • Access channels
  • Flood prevention
  • Increasing depths for ship berthing
  • Wind farm installations
  • Levelling the water bed for pipelines and tunnel sections
  • Increasing the depth of pipelines and cables

Our Water Injection Dredging Fleet

Our fleet offer a broad range of deployment and use options

Nyon
  • Fully road transportable on a flatbed transporter
  • Quickly deployed with a crane or boat lift
  • Max working depth – 10m
  • Average sediment removal rate in excess of 150 m3/hour
  • Length ~ 12.5m
  • Width ~ 4.2m
  • Draft ~ 1m
Arzier
  • Fully road transportable on a flatbed transporter
  • Quickly deployed with a crane or boat lift
  • Max working depth – 10m
  • Average sediment removal rate in excess of 150 m3/hour
  • Length ~ 12.5m
  • Width ~ 4.2m
  • Draft ~ 1m
Doonhamer

We offer an application service for a range of antifoul products.

  • Self contained with crew accommodation on board
  • 5 tonne winch
  • Anchor winch
  • Forward 13 tonne winch
  • Weight ~ 55 tonnes
  • Length ~ 14.6 meters
  • Beam ~ 5.5 meters
  • Draft ~ 1.6 meters
Liverpool Sands
  • Fully road transportable working platform
  • Cutter sucker head, piping and pump for heavier sediments and sands
  • Works either independently or with the water injection fleet

Environmental Impact

The process of transporting dredged material horizontally along the water bed, compared to traditional dredging techniques, results in the following specific circumstances which reduces the impact of the process on the environment:

  • An increased quantity of sediment goes into the lower layers of the water column
  • The rate of sediment input in the natural systems at the dredged area is increased
  • The sediment is transported by natural phenomena to the final destination through the density current
  • The rate of sedimentation in the deposition areas may vary if the natural conditions vary
  • Dredged sediments remain within the ecosystem

Special attention should always be given to areas nearby the dredging location to determine if there are sensitive habitats such as shellfish beds or spawning habitats. In addition, in most cases, if the soil is contaminated water injection dredging is not a suitable method. We can offer advice in organising environmental studies and the types of permissions that are likely to be required prior to dredging.