Strategic Sewage Disposal Scheme (SSDS)
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The SSDS involves the collection and treatment of sewage generated around the harbour at two new sewage treatment works - one on Stonecutters Island to treat sewage from Tsuen Wan, Kowloon, Tsueng Kwan O, Shau Kei Wan, and another at Mount Davis on Hong Kong Island to receive sewage from Central, Wanchai, North Point and Aberdeen. The treated effluent will be discharged into the deep ocean waters south of Lamma Island via a long ocean outfall system. The project is designed in stages in order to achieve early improvement to the sea water quality in the harbour and to allow time for the EIA process on the outfall to be completed. The scheme, which combines a degree of land-based treatment with the ability of the ocean to degrade pollutants naturally, it is considered the most cost effective and environmentally acceptable option.

Hydraulic Engineering plays an important role in the SSDS. A proper hydraulic design of the ocean outfall system is required in order to make optimal use of the self purification capabilities of the ocean. 

(For more details: CIVCAL)

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