A dredging strategy for flood management on the River Parrett and the River Tone in Somerset

A dredging strategy for flood management on the River Parrett and the River Tone in Somerset.
Middlemiss, D.and Ramsbottom, D.
In: Flood & Coast 2017, 28-30 March 2017, Telford, UK. (Submitted) (2017)

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Abstract:Following the severe floods of winter 2013/14, an emergency programme of dredging was carried out on the tidal reaches of the River Parrett and the River Tone to reduce flood risk to the moors and the communities that were affected by the flooding. The Somerset Rivers Authority developed a flood action plan for the Somerset Levels and Moors that covered all aspects of flood management including engineering works and non-structural measures. The plan includes a programme of dredging to reduce flood risk. In order to inform the dredging programme, a dredging strategy was prepared to identify the possibilities of dredging for flood risk reduction. The first stage of the strategy covered the tidal reaches of the River Parrett and the River Tone, and the River Brue. The presentation will cover the River Parrett and the River Tone. Particular challenges on these tidal rivers include the high tidal range and the very high sediment loads from the Severn estuary. There was a need to develop dredging designs which balanced the hydraulic benefit (in terms of reduction in flood levels) with the amount of maintenance dredging that will be needed in the future. The strategy includes some new dredging and a programme of maintenance dredging. The works will be guided by regular monitoring of the river channels to determine the requirements for each maintenance dredge. The presentation will described the dredging strategy including the proposed techniques for both the new dredging and the maintenance dredging.
Item Type:Conference or Workshop Item (Paper)
Subjects:Floods > General
ID Code:1362
Deposited On:17 Jan 2017 11:34
Last Modified:18 Jan 2017 12:36

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