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259 
A Comparison between the Prospect and Kenny Hill 
Schemes, proposing a high-pressure Water Supply 
for Sydney. 
By Mr. F. B. Grpps, C.E. 
[Read before the Royal Society of N.S.W., 6 October, 1880. 
Tue great importance and the general interest of the question of 
water supply to this metropolis are, I venture to say, a sufficien 
not permit any such error of judgment to prejudice you against an 
impartial and unbiassed verdict on the whole merits of the com- 
commend themselves to an attentive consideration :—l. The area, 
storage capacity, and cost of the storage reservoir, 2. The length, 
character, and cost of the conduits, and their duty. 3. Their com- 
mercial and economical qualifications. 4, Their sanitary influence 
respectively. 
SroRAGE RESERVOIR. 
supply. 
to that level at which the outlet conduit is entered. The depth 
left for settlement of suspended matter must 
circumstances, such as the area of the reservoir or the 
the water supplying it; but it should be carefully estimated, as 
any unnece depth simply implies waste of water. The reser- 
voirs of Philadelphia forcibly illustrate the influence of different 
supply sources on this deposit or settlement, for whilst the supply 
that from the Schuylkill only gives finch annually, that from the 
i inch, ‘The accumulation of mud in the 
not only for any accident which may happen to the supply conduit 
and for the emergencies of different seasons, but aie suse 
