XIV. T. W. KEELE. 
above the sea, the total storage to be 10,635 million gallons, 
of which the upper 25 feet, amounting to 7,110 million 
gallons, would be available for distribution by gravitation. 
From this reservoir it was proposed to conduct the water 
by an open canal about 4$ miles long, thence by an iron 
aqueduct about 15 miles in length, to a small reservoir 
capable of holding 400,000 gallons, from whence it would 
flow through a syphon pipe 48 inches diameter, crossing the 
valley of Duck Oreek. From this point, the water to be 
conveyed through an open conduit about 1; miles long, to 
another small storage reservoir at Potts’ Hill, where the 
water would have an elevation of 164 feet over sea level. 
The remaining 10 miles to Crown Street, would be covered 
by a 42 inch pipe, capable of delivering 12 million gallons 
per day. By this arrangement 84 million gallons daily 
could be delivered into Prospect Reservoir, and 29 million 
gallons to a point 14 miles from Sydney. The scheme pro- 
vided for a reservoir at Petersham, to hold 800,000 gallons 
for the supply of that suburb. The total cost of these 
works was estimated at £755,029. 
From the date of the report of the Commissioners being 
submitted to the Government in May 1869, nothing was 
done for several years, beyond making more complete 
surveys and investigations in connection with the scheme, 
especially with reference to the gauging of the streams 
upon the catchment area. 
It will be seen on inspection of the diagram (1) of the 
Sydney rainfall, that with the exception of 1872, and 1875 
and 1876, the rainfall was above the mean, right up to the 
year 1879. ‘The residual mass curve shows an accumulated 
rise above the mean for the ten years from 1869, of 71°67 
inches. This must have affected the level of the ground 
water. The Botany Catchment area being a vast sand bed 
must have received such stores of water, causing a sufficient 
