Brightlingsea Harbour – Dredging

Case Study Overview

Red7Marine were contracted to dredge both the North and South channels of Brightlingsea Harbour, to improve the access for larger vessels and freeing berths to accommodate for growing a number of vessels using the harbour. This project utilised Red7Marine’s back hoe dredger, Red C1.

At a glance

  • Date: Nov 2011
  • Programme Duration: 5 months
  • Project Number: 2308
  • Value: £270,000
  • Client: Brightlingsea Harbour Commissioners
  • Principal Contractor: Red7Marine

The Challenge

The project began in the harbours North channel, where a 400m long channel was dredged to provide ease of access for woodchip carrying ships, offshore windcats and other local vessels utilising the waterway. The dredger was rigged with both floating and sunken pipeline allowing the material to be pumped onto marshland, separating the North and South channels, whilst maintaining a navigable waterway. Further shore pipeline was used to place the material in the designated rills across the marshland.

Straw bales were placed in the rills offering an environmentally friendly solution to stopping the material returning to the channel.

The second phase of the project involved dredging around the harbours berthing jetties which required the floating pipeline to be fitted with quick release joints to increase the dredgers manoeuvrability between the jetties. Changes were also made to the design of the hopper grid, due to a change in dredged material. The adaptations available to the RedC1 allow dredging to be performed effectively in a range of locations and conditions.

Hypack dredging software was used throughout the project combining GPS, tide and depth readings to ensure consistent and accurate navigable channels were dredged.

Brightlingsea HarbourRed C1 dredger and supporting Challis & Sons workboat in the South channel.
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“Great Yarmouth Third River Crossing: The Red7Marine team have played a big part in the success of the cofferdam piling works. Once again, the spirit of cooperation between all involved has been exemplary and this goes a long way towards making life easier for all involved. I would like to pass on my personal thanks to everyone at Red7Marine for your help and I look forward to working with you all again at some point in the future.”

Richard Hayman, Construction Manager BAM Nuttall