220 T. W. KEELE. 



the site for this dam is situated at too low a level (namely, 

 only 50 feet above high water at Sydney) to be connected 

 with the existing system, and would therefore require a 

 separate conduit into the city, and as a dam at a higher 

 elevation on the Wollondilly can be connected with the 

 •existing system, and as I shall presently show that the 

 cost of the water to the consumer would be less from 

 there than from the Warragamba, I would therefore recom- 

 mend the Wollondilly proposal. Briefly, it will consist in 

 the construction of a dam capable of impounding 63,500 

 million gallons of available water at an elevation sufficient 

 to admit of its filtration and subsequent conveyance 

 through a tunnel 26 miles in length, discharging into the 

 Nepean River just above the intake of the Nepean Tunnel 

 at the Pheasants' Nest. I am not in a position to say 

 definitely where the dam should be located, but I think the 

 position shown for it on the map will probably not be far 

 out. The work would have to be commenced about the 

 year 1930 in order to be in readiness to take up the duty of 

 supplying the additional water required in 1937. It is in- 

 teresting to note that by 1946-7 the daily consumption will 

 probably reach such high figures as 211 million gallons, 80 

 million of which will come from the Wollondilly, and, as 

 the limit of reserve storage to supply that quantity, after 

 providing for evaporation and other losses for 600 days, 

 would then be reached, another reservoir higher up the 

 stream would have to be ready to take up the duty of 

 further supply. 



Having forecasted the probable increase of population 

 to be served with water during the next thirty years, and 

 the arrangements with regard to storage which will have 

 to be made for an effective supply to be maintained, I will 

 now submit for your consideration a scheme that has 

 occurred to me, which, if adopted, will bring the whole 



