Water catchment
The ACT draws its water supply from two separate catchment systems.
- The Cotter River catchment. Wholly within the ACT, the Cotter River catchment
was the first to be developed and is part of the Namadgi National Park.
- The Googong system, which was developed on the Queanbeyan River in NSW.
Three dams have been built on the Cotter River, and one has been built
on the Queanbeyan River.
Cotter Dam was constructed in 1912 to serve the needs of the Canberra people
during the establishment years. Water was pumped from Cotter Dam to Mount Stromlo,
where it flowed by gravity to service reservoirs. The height of the dam was
increased in 1951 to meet the needs of Canberra's growing population. In the
1950s the Cotter storage could not hold enough water to cope with a drought,
and a second dam further up the Cotter River was built. More...
Bendora Dam was finished in 1961 and, as it was higher, water could now flow
by gravity to Mount Stromlo Water Treatment Plant (WTP), avoiding the high cost
of pumping. The Bendora gravity main was constructed in 1967. More...
A third dam, Corin Dam, was completed in 1968. Water stored in Corin, the highest
dam in the Cotter River system, is released into the Cotter River thereby controlling
the level of storage in Bendora Dam. More...
Population projections showed that by 1979 the Cotter River system would not
be able to cope with the demand for water. A new dam was required and, after
extensive investigations, a site was selected on the Queanbeyan River. Googong
Dam was constructed. More...
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