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en Pie | DISCUSSION. 
It is very unfortunate that although the literature of the 
Sydney water supply is very voluminous and comprehensive 
there does not seem to be any vade mecum to give one the 
elevations of the various dams, capacity of channels, and 
volumes of delivery for handy reference. The very instruc- 
tive and masterly paper of Mr. Keele, read before this 
Association recently, gives the top level of water under the 
Woronora scheme as 510 feet, and at O‘Hare’s Creek as 
654 feet; also the level of Crown Street 141 feet is men- 
tioned, but otherwise no heights appear to be given with 
regard to either the Cataract dam as built, or the three 
other dams on the upper waters of the catchment area 
which have been surveyed and planned. 
When the Royal Commission on Sydney Water Supply in 
the ‘‘Seventies ’’ considered the Warragamba and the Grose 
schemes, only earthen dams were entertained by the mem- 
bers, and especially with regard to the Warragamba, the 
estimated cost was enormous. Mr. Thomas Woore who was 
the author of the scheme, wrote a pamphlet on the subject, 
and on the 19th October, 1876, the writer read a paper in 
which he contrasted the Commissioners’ dam with one of 
masonry. With the success of the Cataract scheme and 
the practically assured success of the Barren Jack, the 
Warragamba proposal, dismissed in so summary a way by 
the officials of 34 years ago, might be worth looking up 
again. If one were a prophet he would say exactly how long 
it would be necessary to live in order to see that great 
work carried out. Although the available head might be 
only moderate, the watershed of the Warragamba is so 
large that it would be a mighty scheme, and as the writer 
has known the river ina flood to rise 90 feet at the junction 
with the Nepean, the scheme also would be a bold one, 
apart from either the Warragamba or the Grose, and the 
power which might be obtained from them. 
