-17-
22
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.
190