On the Water Supply of Sydney. 145 



Cost. — Proposed dam at Kangaroo Point £81,000 



Side outlet, with sluices for letting off water above 

 low- water level during the process of purification 



by rainfalls 2,000 



Engineering and incidental expenses 7,000 



£90,000 

 I cannot agree with the proposal to abandon the present 

 water supply. All that is required is an additional supply to 

 keep pace with the increasing demand. To provide water for 

 even double the present population would entail loss of, at least, 

 twelve years' interest upon the capital expended, allowing six 

 years from the present time for the completion of any adequate 

 scheme, since it will take eighteen years to double the popula- 

 tion at an increase of 4 per cent, per annum. 



Seeing that a gravitadon scheme cannot be obtained at a 

 reasonable cost, we have no other alternative than to pump 

 water from the George's, or Cook's Rivers (when properly 

 purified), into suitable reservoirs, five of which I have shown at 

 elevations varying from 112 to 210 feet above the sea, leaving 

 all localities that cannot be supplied with a minimum head of 

 225 feet above high water (which can be obtained by the highest 

 of the three reservoirs, I have shown at Bankstown) to be sup- 

 plied by reservoir at Waverley, as proposed by the City 

 Engineer. 



By erecting suitable engines, with filter beds, at the junction 

 of the Canterbury Road with the Salt Pan Creek, water may be 

 pumped into either of the three reservoirs, No. 1 being one mile 

 three furlongs from pump engine-house, at an altitude of 200 

 feet on Collin's Parm ; No. 2 is two miles, at an faltitude of 220 

 feet, near the Irish Harp, Bankstown ; No. 3 is three miles, at 

 the Stony Range, near the thirteenth milestone at Bankstown, at 

 an altitude of 336 feet, as given by the Rev. W. B. Clarke. The 

 two former heights I have ascertained by the most accurate mode 

 of levelling. 



Taking No. 2 as the average, the following will be an approx- 

 imate estimate : — 



Dam, outlet, &c, at Kangaroo Point ... £80,000 

 Engines to pump four million gallons per 



day, engine-house, &c ... ... ... 60,000 



Pilter beds and pipes to reservoir ... ... 16,000 



Reservoir of earthwork, lined with brick on 



edge, in cement, to hold 4 million gallons 4,000 



Twelve miles of 30-inch pipes into Sydney ... 120,000 



£280,000 



