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Conservation & the Environment Creation

Amphibious Excavator

Land and Water’s new river class tug, Clyde, and shallow drafted mud- hoppers were used to transport silts between the recovery and discharge sites, cross-navigating busy shipping lanes, requiring maximum communication during operations.

Floating pumping station arrangement. River Class Tug ‘Clyde’

A pontoon mounted excavator and pumping system was then used to discharge excavated material, recovered from the marinas located on the opposite side of the marsh. The Pump-ashore unit was used to pump the dredged materials up to 900 meters onto the salt marshes. Innovative thinking was required by LAWS to overcome some difficult pumping conditions, with exceptionally cold weather conditions dropping as low as -12 degrees. Works took place within difficult tidal ranges offering only small operational windows, requiring extreme attention to detail and awareness of the surrounding and tidal conditions. Some delays were experienced due to weather conditions and tidal conditions meaning that the site was often completely inaccessible (dry!). Even with these conditions Land and Water met all contractual and environmental deadlines.

Several regulatory, statutory and professional bodies had a keen interest in these highly sensitive saltmarsh works, including the Marine Management Organisation (MMO), the New Forest National Park Authority, the Environment Agency and Natural England. Colin Scott, Managed Realignment and EIA Specialist, of ABP Marine Environmental Research (ABPmer) who advised throughout this project presented the initial findings from this work at the Central Dredging Association’s (CEDA’s) workshop on the use of Dredged Material on 8th May 2012. He commented that: “Land and Water’s Senior Site Manager, Graham North, and his team did a superb job on the Boiler Marsh Sediment Recharge project at Lymington. The team worked in tough conditions in mid-winter to create what already (2 months later) is looking like an effective habitat restoration. However, the work will be subject to on-going monitoring to verify the findings and will be overseen by a specialist panel of regulators and stakeholders who will advise further on its effectiveness. I am confident though that this will provide valuable lessons for the future management of marshes in the Solent and the rest of the UK. ”



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