Surveys.
218. The Survey section was fully employed on many diverse types of surveying including land, marine and sub-marine works. All the works described in the preceding paragraphs were set out and the earth and rubble quantities measured by this section.
219. Progress and check surveys were carried out at regular intervals at public dumps and refuse dumps such as Cheung Sha Wan, Hung Hom Bay, Chai Wan and Gin Drinker's Bay in order to control dumping.
220. Other miscellaneous surveys carried out were:
(a) Soundings for various storm water drain and nullah outfalls inside the harbour.
(b) Soundings and tidal current observations for a sewage disposal scheme at Deep Water Bay.
(c) Tidal current observations in Kowloon Bay for the preparation of a tidal model of the harbour.
(d) Surveys for the demolition of the rock at the approaches to Castle Peak Bay Pier and for establishing beacons at Silver Mine Bay and Tai Po.
(e) Routine survey for pier leases and permits.
(f) Surveys for the proposed new breakwaters at Tsing Yi Island and Cheung Chau Island, a public pier at Tsuen Wan and the Government Stores Department Pier at North Point.
Materials Testing Laboratory
221. During the year, both the number and the scope of the tests undertaken were increased. The Laboratory carried out work not only for the department but also for other departments, private Architects and private Building Contractors.
222. A total number of 8,851 tests were made for the compressive strength of concrete which was 53% more than the previous year. Out of these, 565 tests were carried out for private firms.
223. Other tests included the analysis of fresh concrete, the cement content of hardened concrete and an investigation into the accelerated strength of concrete.
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