demands of the lower levels, nearly 8,000 feet of distribution and sub-mains were laid.
Pineapple Pass Dam (Repairs)
10.41. Since 1946 readings have been taken on the deflection of the Pineapple Pass Dam as a result of the filling of Jubilee Reservoir during the wet seasons, and the subsequent recovery of the dam on the draw-down of the water level during the dry seasons. It was observed that the recovery was not as great as the deflection, with the result that each year there was a residual deformation.
10.42. In order to prevent failure, a consolidated earth embankment together with a toe wall was built against the downstream face. This work was completed in May but it is too early to define the effect on the stability of the dam.
Cheung Chau Water Supply Extension, Stage I
10.43. This extension was necessary as the demand had out-stripped the capacity of the installation completed in 1955. An intake was constructed on a stream course below Ham Tin on Lantau and pumping equipment ordered. 95% of the 10 inch diameter pumping main to the existing Shap Long Reservoir was completed and 95% of the 6" delivery main from Shap Long Reservoir to the Lantau foreshore was duplicated in 10" pipeline.
Tai Lam Chung Scheme
10.44. The Wong Nei Tun Dam and catchwaters E, G, H and I were completed, thereby increasing the indirect catchment of Tai Lam Chung Reservoir by nearly 2,000 acres. Of the 3 remaining sections, Section C made good progress, but Sections A and B ran into serious difficulty due to the soft ground encountered on the steep hillside of a spur. Some of the completed open channel had to be abandoned and the catchwater realigned in the form of a tunnel through the spur. At the end of the year 4,700 feet of open channel and 2,250 feet of tunnel had been completed.
10.45. In addition, slightly over a mile of 30″ welded steel trunk main was laid in Lai Chi Kok Road between Prince Edward Road and Tonkin Street.
Tsuen Wan Supply
10.46. 1,066 feet of 24″ trunk main, and 20,000 feet of distribution mains were laid.
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demands of the lower levels, nearly 8,000 feet of distribution and sub- mains were laid.
Pineapple Pass Dam (Repairs)
10.41. Since 1946 readings have been taken on the deflection of the Pineapple Pass Dam as a result of the filling of Jubilee Reservoir during the wet seasons, and the subsequent recovery of the dam on the draw- down of the water level during the dry seasons. It was observed that the recovery was not as great as the deflection, with the result that each year there was a residual deformation.
10.42. In order to prevent failure, a consolidated earth embankment together with a toe wall was built against the downstream face. This work was completed in May but it is too early to define the effect on the stability of the dam.
Cheung Chau Water Supply Extension, Stage I
10.43. This extension was necessary as the demand had out-stripped the capacity of the installation completed in 1955. An intake was constructed on a stream course below Ham Tin on Lantau and pumping equipment ordered. 95% of the 10 inch diameter pumping main to the existing Shap Long Reservoir was completed and 95% of the 6" delivery main from Shap Long Reservoir to the Lantau foreshore was duplicated in 10" pipeline.
Tai Lam Chung Scheme
10.44. The Wong Nei Tun Dam and catchwaters E, G, H and I were completed, thereby increasing the indirect catchment of Tai Lam Chung Reservoir by nearly 2,000 acres. Of the 3 remaining sections, Section C made good progress, but Sections A and B ran into serious difficulty due to the soft ground encountered on the steep hillside of a spur. Some of the completed open channel had to be abandoned and the catchwater realigned in the form of a tunnel through the spur. At the end of the year 4,700 feet of open channel and 2,250 feet of tunnel had been completed.
10.45. In addition, slightly over a mile of 30′′ welded steel trunk main was laid in Lai Chi Kok Road between Prince Edward Road and Tonkin Street.
Tsuen Wan Supply
10.46.
1,066 feet of 24′′ trunk main, and 20,000 feet of distribution
mains were laid.
63
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