Flood Control
4.67. All the river training works in the vicinity of Yuen Long Town were completed and works on open channels, which extend from the town to the foothills, were commenced. These flood relief works proved to be effective as no flooding of the town occurred during the numerous heavy rainstorms which occurred during the year.
Drainage
4.68. The following table summarizes the work carried out during the year:
New drains laid (length in feet) Defective drains replaced (length in feet) Connections provided (Nos.) Chokes cleared (Nos.) Sand cleared from culverts and nullahs (cubic yards) 321,224 17,036 3,838 16,760 287,5204.69. Investigations continued into the improvements required to the existing sewerage systems in the urban areas of Hong Kong and Kowloon. Improvements are being designed to cater for the increased quantities of sewage expected during the next 10-15 years allowing for the rapid population growth and planned improvements to water supplies.
4.70. Detailed technical reports were prepared for the Central, Wan Chai, Yau Ma Tei and Kowloon South sewerage systems and investigations were commenced for the remaining areas.
4.71. Work commenced on the construction of new branch or main sewers in the Happy Valley and Wan Chai districts of Hong Kong as well as in Sham Shui Po.
4.72. Investigations were commenced to ascertain the degree of pollution in streams at Yuen Long and Shek Wu Hui. This was required in order to determine the extent of sewage treatment that will be necessary.
4.73. A survey showed that it was possible to discharge sewage from Yuen Long into the sea at Castle Peak. Such a scheme would have the advantage of picking up sewage from any existing or future development lying between Yuen Long and Castle Peak.
4.74. Contract documents were prepared for the construction of intercepting sewers and sewage screening equipment for Yuen Long.
4.75. Work on intercepting sewers was in progress in areas 5 and 18 of Tsuen Wan.
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