Monday, 2 March 2015

Turntide jetty works to be completed by July

Much needed work on 160-year-old Turntide Jetty for the benefits of boaters on Breydon Water is to be expected to be completed by July at a cost of £338,000.
The failing Yare wall of Turntide Jetty

The Broads Authority awarded a contract in January for the re-piling of the jetty, which was first constructed in the 1860s.

This jetty directs the flow of the rivers Yare and Waveney where they meet at the southern end of Breydon Water and is a prominent landmark for vessels heading across Breydon Water to the southern rivers and broads.

The Authority inherited it when management of the Breydon Water and Lower Bure navigations was transferred from Great Yarmouth Port Authority in 2010 and recognised that, like a number of other timber structures on Breydon Water, it was in serious decline with some of the piled walls failing and becoming a hazard to navigation.

With significant investment clearly required the we began by commissioning a sediment and water flow study of Breydon water.

This hydromorphological study involved modelling the typical flow regimes in and around Breydon Water, with the aim to predict the likely consequences of maintaining or removing the declining structures of Turntide Jetty and the Dickey Works.

The research also helped us understand the likely dredging requirements under these different scenarios of replaced or removed structures.

The work was completed by a team of specialists from JBA Consulting based in Yorkshire, partnered with the renowned Dutch hydraulic specialists Deltares, who gatherered the data and ran specialist 3D computer models.

In relation to Turntide Jetty the study showed that the structure does effectively direct the flow of the Yare and reduce accumulation of sediment in the Waveney channel. The study did however also suggest that a shorter jetty would still produce the same effect, and direct the flow of the River Yare as desired.
On this basis the decision was made to embark on a project to reconstruct the essential part of Turntide Jetty.

Together with Norwich-based engineering consultants from Canham Consulting, a design was drawn up for a hardwood piled structure similar to the existing jetty which has lasted so long.

A careful tender process was then undertaken at the end of last year for the construction work and the successful contractor G.T Rochester Plant Ltd. from Aylsham will begin work this month.

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