What is a dam?
A dam is built to control and store water. Dams are made from earth, rocks or concrete and are usually constructed on rivers to store the water in a reservoir.
Click here to view and/or download the International Committee on Large Dams (ICOLD) publication “Dams and the World’s Water” an educational Book that explains how dams help to manage the world’s water.
How do Dams work?
Dams store water in the reservoir during times of excess flow, so that the water can be released from the reservoir during the times that natural flows are inadequate to meet the need of the water users.
Why are Dams important?
Dams are important because they provide water for drinking and bathing, water for industry, water for irrigation, water for power generation, water for fishing and recreation, and for other needs.
Definition of Large Dam
A large dam is defined as one which is:
(a) more than I5 metres in height measured from the lowest point of the general foundations to the ‘crest’ of the dam,
(b) more than 10 metres in height measured as in (a) provided they comply with at least one of the following conditions:
(i) the crest is not 1ess than 500 metres in length
(ii)the capacity of the reservoir formed by the dam is not less than 1 million cubic metres
(iii)the maximum flood discharge dealt with by the dam is not less than 2000 cubic rnetres per second
(iv) the dam is of unusual design
No dam less than 10 metres in height is included.
Register of Large Dams in Australia
Australia has over 500 large dams. During 1962, the Australian National Committee on Large Dams (ANCOLD) prepared, on behalf of the International Commission of Large Dams (ICOLD), a Register of Large Dams in Australia for inclusion in their World Register of Dams. Since this time the Register of Large Dams in Australia has been updated on many occasions with the last updates being conducted in 2010.