Why do many Australians depend on underground aquifers for water?

Almost all Australian citizens relying on underground aquifers for water because Australia has a large number of population. It has exhausted the supply of suitable waterways to a dam which was in very short supply in the first instance. It is the alternative way of water sources at a very early time in its settlement. Aquifers are the low-cost, affordable and advantageous addition to water resources, but they are not unlimited.