CO129-588-16 Water Supply- report on the Tai Lam Chung Valley Scheme 3-1-1941 - 3-1-1941 — Page 22

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89.

Pumping Main to Shek-lai-pui Reservoir.

The length of this main would be about 2,400 yards

and it is recommended that its diameter should be 24 inches.

Low Level Supply.

90. The top water level of the 20-million gallon

reservoir would be over 50 feet above that of the Pipers

Hill Service Reservoir, and it is therefore advised that

an independent trunk main be laid, 24 inches in diameter,

as far as the Kowloon Tong Reservoir, continued by an 18-inch

main feeding into the Yau-ma-ti Service Reservoir which is

now supplied from the high level, thereby conserving the

high level water and minimising the cost of boosting.

91.

ESTIMATES8.

Estimates for the Headworks are based on the cost

of different classes of work as ascertained when constructing

the Jubilee Reservoir, and on recent contracts for the

remainder of the works, as it is impossible to predict what

the conditions will be after the war.

92.

It has been assumed that the work is carried out

in instalments, the first two of which would each augment

the sources of supply by 7 million gallons as a daily average.

93. When these instalments approached exhaustion, it

would be necessary to bring in more water by means of the catch-

waters, but a good deal of investigation is required before it

would be possible to frame reliable estimates.

94. We have confined ourselves, therefore, to the

consideration of the first two instalments.

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