The diagrams depict the comparison between the Australian water supply system today and in the future.
Overall, the current Australian water supply only allows dirty water to be treated before it goes to the river. Meanwhile, the future Australian water supply allows dirty water to be treated and recycled into pure water for daily use.
In the recent water supply system, clean water gathered in the storage is distributed to households in the city. Subsequently, the wastewater produced in the city goes to the water treatment plant to be treated in order not to pollute the river before eventually being sent there. In addition, the storm water also goes to the river, but it does not need to be treated beforehand.
The future water supply system, however, has a different system which allows wastewater from the city to be treated in the water treatment plant before it goes back to the city. Furthermore, instead of going to the river, storm water also goes to the water treatment plant, allowing it to be recycled and used by humans.