48 SYDNEY WATEE SUPPLY BY GEAYITATIOK. 



As the Madden Plains and Port Hacking River and all the 

 other streams of the regions comprised in my scheme have no 

 abominable Wainamatta shales to pass through, nor ever touch 

 clay soils, so would they all enter my proposed high and low 

 delivery mains for Sydney and its suburbs in precisely the -same 

 beautiful condition ; and even their transmission through the iron 

 mains would not affect them, as I should propose to coat the 

 mains inside by a bright, effective, and inexpensive enamel, 

 composed of certain resins dissolved in cheap methylated wood 

 spirit, and burnt on to the inner surface of the mains. 



For ocular demonstration of the purity of such waters, I have 

 the pleasure to lay upon the table a bottle of this water, bottled 

 six weeks ago, and from it the Society may judge whether I have 

 extolled those waters more than they deserve. 



So much then for the water supply generally. From all I 

 have seen of the watersheds above alluded to, in my respective 

 trial surveys for the Illawarra Railway and for the water supply, 

 but more particularly from the astounding positions I have lately 

 seen for the making of grand artificial deep-water lakes, and with 

 the facilities presented of leading large extra supplies of waters 

 into them, there is not the slightest question in my mind as to 

 our means of possessing the grandest and cheapest water supply 

 that any city in the world might covet, either by reason of its 

 quantity, its quality, or of its availability for hydraulic power. 



Tliere remains therefore, I think, nothing to be considered but 

 the expense of my proposed method of supplying all Sydney and 

 all its suburbs -v^dth a superabundance of the purest waters by 

 direct gravitation, in wrought-iron or perhaps wrought-steel 

 piping for the high-delivery mains, and in iron mains for the low 

 delivery ; also to consider the expenses of the two large concrete 

 dams at the Loddon and in Port Hacking Eiver, the other smaller 

 tributary dams, tlie one tunnel and the open canal of about four 

 miles from the outlet of such tunnel to the high-delivery inlet of 

 the mains for Petersham and Waverley,. and say 6 miles more 

 of open aqueduct for the north-westerly acquisition of waters 

 from the higher parts of the south coast range. 



The above enumeration of works constitutes the whole source 

 of expenditure as far as Sydney, where suitable reservoirs would 

 have to be made at Waverley and at Petersham in the onset for 

 the high deliveries, and anywhere else in lower Sydney for the 

 low delivery from Port Hacking valley, but which latter might be 

 postponed for a few years until the Botany works might fail to 

 be sufficient to supply theJower demands of the city, although 

 assisted from Waverley or Petersham to relieve the rapidly 

 increasing wants on the higher levels and the distant suburbs in 

 every direction, or perhaps only until the monthly increasing 

 evil of pollution of the Lachlan swamps will make it compulsory 



