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Urban Water Supply: When most Australians turn on the tap, they expect a continuous supply of safe and pleasant drinking water. They expect it to flow at an acceptable pressure and to be available even in the middle of a drought. They also expect their wastewater will not create a nuisance or public health hazard. Furthermore, they expect to be protected from localised or more substantial flooding. 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. Water Resources and Water Cycle: 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