Boston Barrier update - October 2018
Here is the latest information on the Boston Barrier scheme by the Environment Agency.
The multi-million pound project will give Boston one of the best standards of defence against tidal flooding outside of London
The Boston Barrier scheme is deemed a 'National Priority Project' within the Environment Agency's Six Year Programme and is part of the Environment Agency's £2.5 billion investment across the country, which will see 1,500 flood defences reducing risk to 300,000 homes by 2021.
The scheme will give better protection to over 14,000 properties against tidal flooding in the area. The Boston Barrier itself will be installed and commissioned by December 2019 with the project as a whole completed by winter 2020
The Boston Barrier is a rising sector design with hydraulic cylinders that will raise it into place. Once completed it will be 25 metres wide and weigh around 370 tonnes.
Piling is an essential element of the Boston Barrier Scheme and over 2,000 tonnes of steel sheeting are currently being put in place to strengthen the riverbanks in preparation for the barrier.
Residents in the area may experience some higher levels of noise whilst piles are installed on the right bank of The Haven and to create the cofferdam which will provide a watertight workspace for the Barrier.
This has included some work outside of usual working hours which has been undertaken in order to facilitate the movement of construction vessels on the appropriate tides, to ensure the integrity of the embankment is maintained, and to mitigate time lost from severe weather conditions.
The first main phase of piling work should finish towards the end of the year and some secondary works will be undertaken in January at a lesser scale.
Contractors at BAM Nuttall & Mott MacDonald Joint Venture (BMM JV) are monitoring noise and vibration levels at the site closely. BMM JV are using best practice mitigation to help reduce the levels of noise and have installed a noise shroud for the properties directly adjacent to the works along Wyberton Low Road.
Fishing fleet relocation
The fishing fleet have now moved in to their temporary new home at the Port of Boston which will put them downstream of the Barrier works. This will mean that their day-to-day operations will not be affected during the construction process.
The move has involved the demolition of an old grain tower to make way for the construction of a temporary quay and moorings and the installation of new access and egress ladders, mooring poles, fendering and temporary surfacing and service installations.
All other river traffic can now use a bypass channel created between the north cofferdam wall and the quay wall in the Port. It is over 18m wide and sufficient for all small boats to pass through.
The channel operates a one vessel at a time system and vessels with the current behind them have priority.
A guard boat on duty in the river to assist river users who need help and to direct traffic when it gets busy.
• Construct Barrier structure and control building
• Works to Wet Dock Lock
• Sheet piled flood walls on the right bank
• Sheet piled and concrete flood wall on the left bank
• Demolition and construction of new grain conveyors
• Capital dredging
• Diversion of 3 no. 11kv electricity cable
• Scour protection
• Security fencing on the right bank surrounding the barrier structure
• Landscaping and lighting
The year ahead
• Continue construction of right bank embankments
• Cofferdam pump out and excavation
• Construct barrier control room (foundations already in place)
• Fabrication of barrier gate offsite
• Manufacture hydraulic rams
• Construction of the barrier
• Secondary dredging