CHAIRMAN’S ADDRESS, XVII, 
Scheme, for the future supply of the city, which he 
**considered to be much superior as a source of supply, 
and as a permanently secure work, and also to possess 
collateral capabilities of extended usefulness beyond that 
of supplying Sydney. Moreover, though equally cheap in 
supplying 12 million, when extended to 18 million gallons 
per day, the water will be furnished at a cheaper rate 
than by any of the other schemes.”’ 
The collateral advantages referred to by Mr. Clark 
were the utilization of the waste water from the rivers 
along the line of conduit for irrigation, pastoral, and manu- 
facturing purposes. The Commissioner’s scheme provided 
for works above Prospect Reservoir, capable of delivering 
84 million gallons per day; but he thought it well worth 
further inquiry into the value of the surplus water before 
commencing the works, with a view to ascertain whether it 
be sufficient to warrant an increase inthe sizes of the 
conduit and tunnels, to receive a large quantity of 
the water. 
Prospect Scheme commenced 1880—This investigation 
was accordingly made, and the works were ultimately 
designed by Mr. Moriarty, to convey 150 million gallons 
per day as far as Prospect, and 50 million gallons per day 
for five miles beyond it. The surveys made by the Com- 
missioners being for trial purposes only, it became necessary 
to re-survey the whole line, to enable the permanent stak- 
ing out to be done, in order to prepare the work to be let 
by contract in sections, and it was not until Feb. 9th, 
1880, that the first shot was fired at the Nepean Tunnel, 
which practically marked the commencement of the great 
works, which being completed, now stand as a monument 
to the founders, and minister to our health and comfort in 
the present day. 
It is not my intention to go into any details in order to 
describe the construction of these works, and the difficulties 
2—May 20, 19088 
