348
16
Hong Kong Annual Administration Reports, 1841-1941
COLONIAL REPORTS-ANNUAL.
The breakwater is 3,325 feet in length, and encloses an area of 165 acres. Entrances to the refuge are provided at both ends of the breakwater, the southern being 390 feet and the northern 300 feet in width.
In addition to the breakwater, the work comprised a concrete and masonry pier, 450 feet long by 30 feet wide, and a reclamation extending over a rocky shoal near the northern entrance. The reclamation has an area of 187,100 square feet, and is protected partly by a pitched slope and partly by a concrete and masonry sea-wall. A short masonry pier-head projects from the reclamation.
The depth of water at the entrances at L.W.O.S.T. is 18 feet, the depth within the shelter varying from 9 feet to 18 feet; 82 per cent. of the enclosed area has a depth exceeding 12 feet at L.W.O.S.T., and 56 per cent. has a depth exceeding 15 feet.
The breakwater consists of a rubble mound 192 feet in width at the base, 20 feet at the top, and 44 feet in height. It is faced above L.W.O.S.T. with concrete blocks on the outer side and coursed granite rubble pitching on the inner side, and is paved on top with concrete blocks. A trench of an average depth of 9 feet was dredged in the harbour bottom for the entire length and width of the base of the breakwater prior to the deposition of rubble. The rubble mound is composed of stone varying in weight from 1 cwt. to 5 tons, the total quantity deposited being about 850,000 tons.
In all, 12,453 concrete blocks were used in the work, of which 11,379 were pitching and paving blocks of 2 tons each, and the remainder principally foot-blocks for the inner slope, which were of the same weight. The foot-blocks for the heads of the breakwater, which are of granite encased in concrete, are much heavier, weighing over 5 tons each, and the foot-blocks for the outer slope are wholly of granite and weigh 3 tons each. The granite pitching stones for the inner slope averaged 1 ton in weight, 17,098 being used.
The large masonry dam of the Tytam Tuk reservoir was constructed to a height of 49 feet above the stream-bed, or a total height of 90 feet from the lowest part of the foundations, and, towards the end of the year, a considerable quantity of water was impounded. The laying of two additional cast iron pumping mains, 18 inches diameter, was completed. An extension of the pumping station buildings to accommodate the additional pumping machinery, the whole of which arrived from England, was nearly completed. The new boilers were set and a commencement was made with the erection of the pumping engines.
The repairing and coaling depôt for Government launches at Yaumati, described in last year's Report, was completed, except the carriage and hauling gear for the slipway and the erection of the pier. It was decided to instal an electric capstan for hauling up vessels on the slipway. The ironwork for the pier did not arrive until the latter part of the year.
Page 355
Page 356
348
16
Hong Kong Annual Administration Reports, 1841-1941
COLONIAL REPORTS-ANNUAL.
The breakwater is 3,325 feet in length, and encloses an area of 165 acres. Entrances to the refuge are provided at both ends of the breakwater, the southern being 390 feet and the northern 300 feet in width.
In addition to the breakwater, the work comprised a concrete and masonry pier, 450 feet long by 30 feet wide, and a reclamation extending over a rocky shoal near the northern entrance. The reclamation has an area of 187,100 square feet, and is protected partly by a pitched slope and partly by a concrete and masonry sea- wall. A short masonry pier-head projects from the reclamation.
The depth of water at the entrances at L.W.O.S.T. is 18 feet, the depth within the shelter varying from 9 feet to 18 feet; 82 per cent. of the enclosed area has a depth exceeding 12 feet at L.Ŵ.O.S.T., and 56 per cent. has a depth exceeding 15 feet.
The breakwater consists of a rubble mound 192 feet in width at the base, 20 feet at the top, and 44 feet in height. It is faced above L.W.O.S.T. with concrete blocks on the outer side and coursed granite rubber pitching on the inner side, and is paved on top with concrete blocks. A trench of an average depth of 9 feet was dredged in the harbour bottom for the entire length and width of the base of the breakwater prior to the deposition of rubble. The rubble mound is composed of stone varying in weight from cwt. to 5 tons, the total quantity deposited being about 850,000 tons.
In all, 12,453 concrete blocks were used in the work, of which 11,379 were pitching and paving blocks of 2 tons each, and the remainder principally foot-blocks for the inner slope, which were of the same weight. The foot-blocks for the heads of the breakwater, which are of granite encased in concrete, are much heavier, weighing over 5 tons each, and the foot-blocks for the outer slope are wholly of granite and weigh 3 tons each. The granite pitching stones for the for the inner slope averaged ton in weight, 17,098 being used.
The large masonry dam of the Tytam Tuk reservoir was constructed to a height of 49 feet above the stream-bed, or a total height of 90 feet from the lowest part of the foundations, and, towards the end of the year, a considerable quantity of water was impounded. The laying of two additional cast iron pumping mains, 18 inches diameter, was completed. An extension of the pumping station buildings to accommodate the additional pumping machinery, the whole of which arrived from England, was nearly completed. The new boilers were set and a commencement was made with the erection of the pumping engines.
The repairing and coaling depôt for Government launches at Yaumati, described in last year's Report, was completed, except the carriage and hauling gear for the slipway and the erection of the pier. It was decided to instal an electric capstan for hauling up vessels on the slipway. The ironwork for the pier did not arrive until the latter part of the year.
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