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Drainage and Anti-pollution Projects
PUBLIC WORKS AND UTILITIES
Sewage from buildings is generally conveyed by a separate system of sewers and, in most cases, is discharged into the sea via submarine outfalls after screening to remove offensive solids. During the year new sewers were laid in Aberdeen, Chai Wan and Sham Shui Po. The construction of a submarine outfall at Aberdeen was started.
Concern over environmental pollution continued to be reflected in the emphasis placed on sewage treatment and wastes disposal, and the abatement of water pollu- tion. There was good progress in the experimental work at Shek Wu Hui pilot sewage treatment plant to assess the suitability of various sewage treatment methods. The design of new sewage treatment works at Tai Po, Yuen Long and Aberdeen was in hand. The construction of a temporary sewage treatment plant at Sha Tin new town was completed and part of the plant went into operation. Consulting engineers were engaged to proceed with the design of Stage I of a permanent sewage treatment plant to serve the new town.
Monitoring of water quality in local waters was continued to obtain long term data for the design of new facilities for sewage treatment and disposal, and to establish pollution levels and trends. A data report summarising all monitoring results to the end of 1974 was prepared. A preliminary investigation on various methods to improve the quality of water in Kowloon Bay typhoon shelter was completed and recommenda- tions made.
An arterial drain at Kwai Chung and drainage improvement works at On Lok Tsuen, Fanling, were completed, as well as the laying of stormwater drains in Wong Tai Sin. The design of new stormwater drains in Au Tau, Yuen Long, was in hand, and works in progress included the construction of the last section of the Shing Mun River training works at Sha Tin and an arterial drain at Chai Wan; the extension of a nullah at Staunton Creek, Aberdeen; and the laying and extension of stormwater drains in the Central and Kennedy Town reclamations.
Port Works
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On Hong Kong Island, the seawall was completed for the fifth and final stage of the Central reclamation scheme, incorporating seven salt water pumphouses. A further pumphouse was constructed at Edinburgh Place to provide cooling water for the air-conditioning system of Murray Road car park and the future Murray Building II. At Aberdeen, work started on 125 metres of seawall which will retain a reclamation for a future sewage screening plant.
A contract was let for dredging the central fairway in the harbour to a depth of 11 metres below chart datum. When completed in 1976, this will enable large vessels to reach the central part of the harbour from the western approaches. This access is needed because the eastern fairway will be closed for the most part to ocean-going vessels while the mass transit railway tunnel is being constructed.
In Kowloon, work was completed on the first phase of the Sham Shui Po reclama- tion scheme. The land will provide an area for a new ferry concourse and a section of
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