. HYDRO ELECTRIC INSTALLATIONS. LXIX. 
(d) By such development of electric power the price of 
water to the irrigationist would be reduced, and this is an 
important matter if irrigation is really to be successful. 
(e) In other countries it has paid to build large dams 
merely for electric power, and therefore expenditure on 
dams which provide water for irrigation as well as power 
would appear to be still more justified. 
(f) When the Trawool dam in Victoria is built, it will be 
easily first amongst the reservoirs of the world, for the 
amount of water stored as compared with.the size of wall. 
(g) At a conservative estimate it will develop at least 
10,000 HP. all the year round, without in any way inter- 
fering with the use of the water for irrigation. 
(h) In order to enable water from irrigation dams to 
be used for power a balance reservoir at a lower level 
is necessary to catch the water passing over the main 
dam when it is not required for irrigation. 
(j) To reduce the amount which may have to be paid — 
in compensation in the future, Governments would do 
well to reserve all valleys which are at all likely to be 
required for water conservation. 
(k) Given a supply of electricity from a hydro electric 
station it does not follow that it need be transmitted over 
long distances in order to find a market. 
(1) Some of the largest water powers such as Niagara and 
- Rheinfelden have electro chemical and metallurgical 
factories near the power house. They give an ideal load, 
so the price of power can be very low. : 
(m) Refining of copper electrolytically and the manu- 
facture of carbide of calcimum are two processes which 
could at the present time absorb a great deal of electric 
power. 
