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The image contrasts two water supply systems: the left diagram showcases the present system where water flows from dam/storage to a water treatment plant, then to households, shops, factories, and the city, before waste water returns to the river; pure water flows uninterruptedly to these points, storm water from the city only flows to the river, and waste water from all points goes to the river. The right diagram depicts the future system where water flows similarly from dam/storage to the treatment plant, then to households, shops, factories, and the city; however, waste water now gets filtered back to the water treatment plant before proceeding to the river, and storm water flows directly to the river.
Given the complexity of the image, the above description may not be entirely accurate.
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The diagram illustrates the way the water supply system currently works in Australia and how the system will be changed in the future.
Overall, although both systems use the dam as a water supply, the present system returns both storm and wastewater directly or indirectly to the river, whereas the future system plans to recycle both forms of water.
The current water supply system shows that water is stored in a dam before being transferred to a city to be used by households, shops, and factories. From the city, storm water is directed to straight into the river, by contrast waste water is sent to a water treatment plant to processed. After the wastewater is treated, it is safe to be released into the river.
Regarding the future water supply system, water will be brought from the dam for the same uses as it is at present. However, both stormwater and wastewater from the city are to be directed to the water treatment.
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