CHAIRMAN’S ADDRESS. XIII, 
Under the second head, they found that the then existing 
scheme from Botany could barely be made adequate to the 
wants of Sydney, and could not keep pace with the 
demands of an increasing population, that it should there- 
fore be abandoned for another scheme, which they would 
hereafter describe, and that no more money should be 
spent in its improvement. 
Under the third head, they made careful inquiry into 
various projects which had been brought forward from 
time to time, together with investigations of their own, 
viz. :—The Grose, Warragamba, and George’s Rivers; the 
Upper and Lower Nepean River; Burralow and Wheeny 
Oreeks; the Colo River and Couridjah Lagoons, and they 
ultimately recommended the scheme known as the Upper 
Nepean which they had originated. 
Briefly, the general features of the scheme were, the 
intercepting of the drainage from 350 square miles of 
country lying at the head of the Nepean, Cordeaux, and 
Cataract Rivers, by small diversion weirs situated at the 
Pheasant’s Nest—at the junction of the two former rivers 
—and at Broughton’s Pass on the Cataract River, and 
connecting these points by a tunnel, through which the 
waters would pass, the combined stream at Broughton’s 
Pass, at a level of 421 feet over sea, being conducted 
through another tunnel, emerging on the western slopes of 
the main dividing range, separating the waters of the 
Nepean from those of George’s River. A conduit consist- 
ing principally of open canal, but tunnel through the hills, 
and wrought iron aqueducts across creeks and the railway, 
would lead the water to Prospect, over a total length of 415 
miles from the Pheasant’s Nest. At Prospect a reservoir 
was to be constructed, by throwing an earthern bank—1; 
miles in length, and 80 feet at the deepest place—across a 
valley where the waters would be held up to a level of 195 ft. 
