A happier environment for fish
17 September 2015
A thermal curtain directs warmer surface water to the tower outlet.
Photo: Guresh Ahuja, WaterNSW
Just below the sun-warmed surface of a dam, the water temperature can be breath-catchingly cold. So imagine how chilly the water gets when you descend another 20, 30 or even 50 metres to the dam bed.
Thermal stratification, where water layers have different temperatures, is common in large bodies of water, particularly in spring and summer when air temperatures are high.
Water released from outlets near the base of large dams generally comes from the bottom layer and can be as much as 12 degrees colder than the upstream river.
Read the full story in the Newsroom.