Abstract
The Isle of Thanet in South East England is an important holiday area with a total summer population of 180,000 in the four seaside towns of Birchington, Margate, Broadstairs and Ramsgate. Sewage is discharged to sea through short sea outfalls causing pollution of local beaches. The feasibility study into possible solutions showed that marine treatment is generally the most cost effective solution for coastal towns and that local solutions were cheaper than area solutions due to the significant impact of transfer costs. The marine treatment schemes now being built provide preliminary treatment of fine screening and grit removal in enclosed headworks with high velocity, plug flow, operation of the outfalls. Special structures have been provided to protect the tapering manifold multi-port diffusers and to provide access to the outfalls. Installation of the outfalls was successfully achieved from difficult clifftop sites.
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