XLVI. T. W. KEELE. 
In the future when further storage is required, another 
of these dams can be built, and so on until the utmost use 
has been made of the catchment area. Under this system 
of increasing the storage, which no doubt would serve 
Sydney for a very long time, the water would continue to 
be delivered by gravitation to Crown Street at 141 feet 
above sea level, and to Ryde at 97 feet, being thereafter 
raised by pumping to the higher levels. The quantity of 
water at present pumped from these stations is 60% of the 
total supply, and as time goes on, no doubt this will increase 
considerably. 
Advantages of a High Pressure Gravitation Supply.— 
The advantages to be derived by the delivery of water 
by gravitation, at a sufficient level to enable pumping to 
be dispensed with are so great, that, as we have already 
seen, strenuous efforts were for a long time made by the 
supporters of the Kenny Hill project to gain it. As that 
scheme was not an independent one, and did not add any- 
thing to the existing supply by increasing the catchment 
area, and moreover was limited in its delivery to a level 
insufficient to satisfy the fast growing settlement on the 
higher parts of the city, and as it was not thought possible 
to obtain these advantages of high pressure, without very 
great expense in bringing in the water from the mountain 
streams, such as the Warragamba, Colo, and Grose rivers, 
the citizens have accepted the situation, and have been 
content with the present system of gravitation with 
pumping. 
A scheme has however, now been evolved which will 
fulfil all the requirements, viz., it will provide an entirely 
independent supply of additional water, derived from a 
gathering ground separate and distinct from the present 
catchment area, and at a sufficient pressure to dispense 
almost entirely with pumping. It is capable of expansion 
