4.43. Marine and land boring units carried out investigations at several locations throughout the colony.
Surveys
4.44. The following survey work was carried out:
(1) Hydrographic surveys at Castle Peak Bay and Sha Tin Hoi for the planning of development in these two districts, and at Shuen Wan in Tolo Harbour, and at Chek Keng in Long Harbour for the formation of typhoon shelters. (2) Tidal level and current velocity observations in Aberdeen Harbour and Aberdeen Channel for the proving tests of the harbour model under construction at the Hydraulics Research Station, Wallingford, England.
(3) Sounding surveys for locating uncharted obstructions and for the erection of navigation beacons over rocks at north west Lantau, Rocky Harbour, Inner Port Shelter, Tolo Channel, Long Harbour and Mirs Bay.
(4) Echo sounding surveys in the central harbour area in the vicinity of the new Ocean Terminal and in the Tsuen Wan and Tsing Yi Island area. (5) Float tests and current meter observations at various locations to determine suitable positions for submarine outfalls for the Castle Peak Development and Sham Shui Po Sewerage Schemes.
Materials Testing Laboratory
4.45. Physical tests on soil and building materials carried out during the year totalled 34,121 and comprised the following:
(1) Concrete tests
(2) Cement tests
(3) Aggregate tests
(4) Metal tests
(5) Bitumen and Bituminous material tests
(6) Soil tests
...
(7) Miscellaneous tests
...
23,945
622
1,805
...
...
4,650
343
1,890
866
4.46. The above included 15,346 tests for private firms and architects providing a revenue of $140,579; an increase over last year of 37% in terms of tests and 67% in terms of revenue. The total number of tests undertaken was 8% more than last year.
4.47. New laboratory equipment acquired during the year included a concrete coring machine and two self-recording consolidation machines.
General
ROADS AND DRAINAGE DIVISIONS
Chief Engineers:
New Territories: T. K. Hum, M.Eng., A.M.I.C.E., M.E.I.C.
Hong Kong Island: H. D. Stead, M.Sc., D.I.C., A.M.I.C.E.
Kowloon: G. A. G. Sapstead, A.M.I.C.E. (Acting)
4.48. Each of the three Roads and Drainage divisions operated territorially, under a Chief Engineer. It was found that the combination
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