HYDRO ELECTRIC INSTALLATIONS LV. 
be seen later these extra high head falls present many 
advantages over those of low head. 
Trawool Dam and Power.—Though lacking natural water 
power there are few countries in which large bodies can 
be so cheaply conserved by dams other than Australia. 
Some four years ago Messrs. J. M. and H. H. Coane, 
of Melbourne, asked the writer to join them in a scheme 
for building a large dam at Trawool on the Goulburn 
River with a view to conserving water for irrigation and 
at the same time to develop electric power. Flying surveys 
showed that with a dam about 1800 feet long and 180 feet 
high 60,000 to 70,000 million cubic feet of water could be 
impounded; that istosay,about double the amount conserved 
by the Assouan Dam or Barren Jack. A large amount of 
data was got together, including estimates of the electric 
power that could be developed at the second, sixth, and 
tenth year of working with power factors of 30, 40, and 
507%, and the project was submitted to the Victorian 
Government. Some engineers have stated that power 
cannot be economically generated from such irrigation 
dams; and on the other hand, there are some who hold 
extravagant ideas of what can be done. The truth lies 
somewhere between, and certainly so far as Trawool is 
concerned the writer is convinced that such an amount of 
power can be developed all the year round as to make it 
well worth while laying down an installation. It is also 
likely that other irrigation dams could be made to develop 
power if well engineered and balance reservoirs were pro- 
vided. Whenin Victoria, Mr. C. H. Merz was given par- 
ticulars of Trawool, and it is interesting to note that one 
of the main conclusions in his Hlectrification of Railways 
Report reads :— 
“At a later stage when the demand for power has developed 
still further, additional power should be obtained from a water 
power station at Trawool.” 
