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Water supply and demand

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  • 1. Perth’s WaterSupply & Demand
  • 2. Perth’s Water Usage - Demand• Australians are among the highest users ofwater in the world, and Perth remains one ofthe highest water using cities in Australia.• Residential households are the highest usersof public water, using around 71% of watersupplied from the Integrated Water SupplySystem. This means that households have thegreatest potential to save water.
  • 3. Residential Water Use in Perth
  • 4. Perth’s WaterSources -Supply
  • 5. Desalination• http://www.watercorporation.com.au/D/desalination.cfm?uid=5463-2043-3200-6815• http://www.youtube.com/watch?feature=player_embedded&v=2dwjYr1anyw
  • 6. Rainwater inflow into Perth Dams
  • 7. Our Current Dam Storage Levels
  • 8. Catchments• http://www.watercorporation.com.au/R/rainfall.cfm?uid=2642-8368-3500-3610
  • 9. Groundwater• Groundwater is derived from rain whichpercolates down through the soil or fracturesin rock, filling up the pores between sandgrains or the fissures in rocks. Anything fromnone to half of the rainfall in a given area mayreach the water table and thus recharge thegroundwater.• Approximately 35-50% of the water suppliedto Perth comes from groundwater supplies.
  • 10. Aquifers• Geological formations such as thosecomposed of sand, sandstone and limestonewhich contain useable quantities ofgroundwater are called aquifers.– The Gnangara mound occurs to the north of city– Jandakot mound occurs to the south– Yarragadee, which is often greater than 1000meters thick
  • 11. Water Treatment• Treated groundwater is pumped from wellfields togroundwater treatment plants• Treated to make it suitable for drinking beforedistribution to customers• Before being added to the distribution system.• Treatment usually involves aeration, settling ofsuspended solids and filtration.• Both surface water and groundwater are treated withchlorine for disinfection. Fluoride is also added toprovide dental health protection in accordance withDepartment of Health requirements.
  • 12. Reducing Demand& Increasing Supply• Water recycling is an essential part of maintaining areliable, sustainable and safe water supply for WesternAustralia.• Increasing the amount of water that is recycledis crucial to managing our precious drinking waterresources efficiently and making the most of ourwastewater resource that is often wasted water.• By 2060, the Water Corporation intends to:– Reduce water use by 25%;– Increase wastewater recycling to 60%; and– Develop up to 100 gigalitres of new sources.
  • 13. Our Blue Planet• http://www.recycledwater.com.au/