During the 19th and particularly the 20th centuries, engineers have designed and built urban water systems to meet these expectations.

The entire area from which a stream or river receives its water is called a catchment. A catchment is a natural drainage area, bounded by sloping ground, hills or mountains, from which water flows to a low point.

The water cycle begins with rain, which in turn will either fill up dams or fall into catchment areas etc.

Then the water travels to a water treatment plant where it is cycled through until safe and ready for urban use. Once The water has been used in homes in the community it is then passed along as sewage to a sewage treatment plant, and then finally back into our waterways.

Virtually everybody lives in a catchment, which may include hundreds of

The quality of the catchment determines the quality of the water harvested from it. Few communities have pristine water sources and the quality of water from most sources is at risk from activities occurring in the catchment.

It is estimated that only 0.6 per cent of the Earth's water is readily available as a source of water supply to its six billion people and the urban communities they form. Water is a precious resource and, for many

Some topics in this essay:
Projections Water, Quantity Quality, Importance Water, Despite Australia, Water Cycle, Supply Australians, Alice Springs, Term Viability, Usage Australia's, Sydney Harbour, water supply, urban water, water resources, water-efficient appliances, cent earth's, cent water, quality water, safe pleasant, urban water systems, water systems, water 70 cent,  refraining, cent earth's water, ecologically sustainable development, water collected environment,