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Jerial of
ervoir Dam.
works.
The only plan is to base the calculation upon the
Hong Kong data. In my report of 17th September 1896, I analysed these data using a train of reasoning somewhat different to that adopted by Mr Cooper, in his report of
-They 222 1896, and arrived at the following conclusions. agree closely with Mr Cooper's conclusions.
(a) That the minimum annual available rainfall
amounts to 30 inches.
(b) Therefore a gathering ground of 1,000 acres will afford 1,860,000 gallons per diem in the year of
minimum rainfall.
(c)
That to provide this quantity 200 days storage
will be required.
The gathering ground of proposed source No. 1
1s 333 agres, or one third of 1,000. A supply of 1.860.000
3
630,000 gallons a day may, therefore, be expec- ted, and to secure it, a reservoir capacity of 124 millions
The desired immediate sup- of gallons, will be required.
ply is only 413,000 gallons, and the proposed reservoir contains 120,000,000 gallons. According therefore to Hong Kong data there is a liberal margin; and taere can be little doubt that a bountiful supply will be obtained.
The actual amount must remain in uncertainty until the works are completed. It is desirable that rain gauges should be forthwith erected on each of the proposed sites.
Comparison of Observations should be commenced at once.
the first year's observations with present and past ob- servations at the Observatory, will afford a means of correcting the estimate of probable yield.
(4)
It is proposed to make an sarthen dam with a puddle wall in the centre in the ordinary manner, at
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