WHEN LAKE COLERIDGE WAS AT ITS LOWEST.—This photograph, taken in September, 1930, when Lake Coleridge reached its record low level, is a warning of what will happen if the lake drops only four feet more. At the 1930 low level, the whirlpool shown formed ominously over the intake leading to the power-house, indicating that the load on the generators would have to be reduced and that the point where the station had to close down might not be far away. If there is not a great deal of water above the intake, there is a danger that turbines turning at high speed will suck in air through the vortex of a whirlpool, like that formed on a small scale in a bath when the last bit of water is emptying.

Press, Volume LXXXIII, Issue 25206, 10 June 1947, Page 5

WHEN LAKE COLERIDGE WAS AT ITS LOWEST.—This photograph, taken in September, 1930, when Lake Coleridge reached its record low level, is a warning of what will happen if the lake drops only four feet more. At the 1930 low level, the whirlpool shown formed ominously over the intake leading to the power-house, indicating that the load on the generators would have to be reduced and that the point where the station had to close down might not be far away. If there is not a great deal of water above the intake, there is a danger that turbines turning at high speed will suck in air through the vortex of a whirlpool, like that formed on a small scale in a bath when the last bit of water is emptying.