268 THE PROSPECT AND KENNY HILL SCHEMES, 
Clark, ensures only a low service supply of twelve — 
gallons daily to Crown-street, of which 1 ion gal 
pumped to Paddington and Waverley, that of the Kenny ll 
scheme ensures a supply of three million gallons daily under 
cirumstances, to Waverley, Woollahra, and the North Shore, and 
i Paddi 
gallons except under the most extraordinary and eer cir- 
cumstances. The advantage claimed for the Prospect. scheme is 
its power of increment, at a much smaller cost. Acco Mr. 
Clark’s report, twenty-nine million gallons are brought within 14 
miles of Sydney. To deliver this quantity into Crown-street would 
require two 36-inch diameter pipes in addition to the ee pro- 
posed works, which, at the same estimate as for the pi ipe-line from 
Kenny ~~ would cost £293,265. But with one additional — 
million gallons to Crown-street, and 21 million gallons to sae 
ton ; so that the actual difference would not exceed £41,895 10s 
Whilst, with a yet larger increment, this difference would be 
reduced toa minimum, as the whole conduit as far as 
would have to be enlarged. That the pipes are equal to to the duty 
accredited to them may be inferred from the fact alluded to in 
that even the static pressure of such a column WO! a 
thickness of over 1} inch to withstand it. of thane wes 
tions seem tome more imaginative than real, as by @ an 38 
application of air momentum, relief and influx ease “ye 
always accompany the laying of a long pipe- large ‘ amply 
sions, the different thickness I have al towed “would ber 
it to overflow and tear away its banks and: de 
beneath it as to cpt ~ an objection to a 
Mr. Clark, in his report on Mr. ning’s L c e. 
carribee scheme, her, woh * anticipated no such ernie: a! 
twice the head and a longer pipe-line was . toc es 
as follows :—“ The better plan in such ‘a system 18°00" 
flow of the water by a sluice placed at or near its w 
the pipe is left entirely open at its lower end. By 
