XLVIII. T. W. KEELE, 
miles long can be made into the Cataract reservoir, which 
would release all the water there if required above the 
900 feet contour, amounting to 18,000 million gallons, thus 
converting the water impounded there from low to high 
pressure. ‘The water would pass froma valve tower in the 
dam at the intake of the tunnel into O’Hare’s Creek, and run 
down into the reservoir there, to be passed on as required 
into the Woronora reservoir. Supplemented thus by the 
water from Cataract reservoir, the high pressure scheme 
can be depended on to supply 50 million gallons per day if 
necessary, the tunnels being made large enough in the first 
instance to convey the maximum quantity, and the pipes 
to be duplicated when the necessity arises for the increased 
supply. The head of water derived from the Woronora 
reservoir will be sufficient to serve all the high levels about 
Bankstown, also the zone at present served by the Cen- 
tennial Park reservoir, the heights of Canterbury, and the 
Illawarra suburbs. Should a greater pressure be required 
for a fire service, it can be obtained by extending the pipe 
from the Woronora dam to the outlet of the tunnel from 
O’Hare’s reservoir, and making connection there, when an 
additional head of 144 feet above the top water level of 
Woronora reservoir, viz. 654 feet above sea level can be 
obtained. 
Alternative Scheme.—An alternative scheme provides 
for the diversion of the water from the Woronora 
and O’Hare’s Creek reservoirs, into the existing canal 
just below the drop at the Sugarloaf, by means of 
a tunnel about 10 miles in length, which would intercept 
the drainage from about 84 square miles of country, 
being about 25 square miles more than by the first 
scheme. The levels admit of the water being drawn 
off from the Woronora reservoir, at an elevation of 410 
feet over sea, through the tunnel having a fall throughout 
of 24 feet per mile, and a delivering capacity of 50 million 
