distribution. The submarine pipe line is being fabricated and externally protected with concrete on dry land and will be sunk in position in one operation. 6,300 ft. have been joined, and 2,400 ft. of protection completed. The design of the pump house was started, 5,700 ft. of mains were laid on Peng Chau and 85% of the service reservoir main walls was completed during the year.
7.74. Hei Ling Chau will be supplied by a 6" dia. submarine pipe line laid southward from the cross-connection chamber and across the narrow passage between Chau Kung and Hei Ling Chau to a reception tank on the latter island. 450 ft. of the submarine length were jointed and 180 ft. was externally protected in concrete.
Shek Pik & Tung Chung Water Schemes
7.75. These centre on the construction of a 5,399 million gallon storage reservoir at Shek Pik on Lantau Island. Its natural catchment area is extended by catchwater channels and tunnels to bring in the run-off from 3,389 acres of the southern slopes of Lantau as well as 2,628 acres from the northwest by tunnel through the main mountain range of the Island. The completion of 2,800 ft. of trapezoidal concrete lined catchwater channel saw the completion of all the above work. These catchment areas are being further extended to collect the run-off from 2,942 acres on the northern side of the Island above the 230 ft. contour which lie to the south of the village of Tung Chung by gravity flow tunnels. To provide access to the tunnel portals on the northern side of the island 23,500 ft. of access road were formed from Cheung Sha to Tung Chung with branches to the working faces. The main work consists of 11,850 ft. of catchwater tunnel varying from 14 ft. to 16 ft. in diameter, together with a 12,370 ft. of 16 ft. diameter main tunnel through the central mountain range to discharge the collected water into the Shek Pik Reservoir's direct catchment. 9,720 ft. of tunnel were driven which, with that driven in 1963–64, completed 43% of the total length of 24,220 ft. Provision was also made for the extension of this aspect of the scheme to collect the run-off from below the Tung Chung paddy fields so that it could be pumped to near the northern portal of the main tunnel.
7.76. The raw water is treated at Silvermine Bay on Lantau Island and gravitated by submarine pipe line to Sandy Bay on Hong Kong Island from where it is distributed to existing and proposed service reservoirs. A 30 million-gallon capacity service reservoir at a level of 465 ft. on the southern side of Mount Davis was 80% completed, whilst at a level of 85
distribution. The submarine pipe line is being fabricated and externally protected with concrete on dry land and will be sunk in position in one operation. 6,300 ft. have been joined, and 2,400 ft. of protection completed. The design of the pump house was started, 5,700 ft. of mains were laid on Peng Chau and 85% of the service reservoir main walls was completed during the year.
7.74. Hei Ling Chau will be supplied by a 6" dia. submarine pipe line laid southward from the cross-connection chamber and across the narrow passage between Chau Kung and Hei Ling Chau to a reception tank on the latter island. 450 ft. of the submarine length were jointed and 180 ft. was externally protected in concrete.
Shek Pik & Tung Chung Water Schemes
7.75. These centre on the construction of a 5,399 million gallon storage reservoir at Shek Pik on Lantau Island. Its natural catchment area is extended by catchwater channels and tunnels to bring in the run-off from 3,389 acres of the southern slopes of Lantau as well as 2,628 acres from the northwest by tunnel through the main mountain range of the Island. The completion of 2,800 ft. of trapezoidal concrete lined catchwater channel saw the completion of all the above work. These catchment areas are being further extended to collect the run-off from 2,942 acres on the northern side of the Island above the 230 ft. contour which lie to the south of the village of Tung Chung by gravity flow tunnels. To provide access to the tunnel portals on the northern side of the island 23,500 ft. of access road were formed from Cheung Sha to Tung Chung with branches to the working faces. The main work consists of 11,850 ft. of catchwater tunnel varying from 14 ft. to 16 ft. in diameter, together with a 12,370 ft. of 16 ft. diameter main tunnel through the central mountain range to discharge the collected water into the Shek Pik Reservoir's direct catchment. 9,720 ft. of tunnel were driven which, with that driven in 1963–64, completed 43% of the total length of 24,220 ft. Provision was also made for the extension of this aspect of the scheme to collect the run-off from below the Tung Chung paddy fields so that it could be pumped to near the northern portal of the main tunnel.
7.76. The raw water is treated at Silvermine Bay on Lantau Island and gravitated by submarine pipe line to Sandy Bay on Hong Kong Island from where it is distributed to existing and proposed service reservoirs. A 30 million-gallon capacity service reservoir at a level of 465 ft. on the southern side of Mount Davis was 80% completed, whilst at a level
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