| Back |	2.3 How can water supply and demand be managed sustainably?
	Questions to follow up: (Think of your own questions to add to this list too)
	Demand Factors in Tucson
	What is the total population? What is the rate of growth? What are the main demands for water? (see PowerPoint slide) What are the main industries
	Supply Factors in Tucson
	Why has water supply always been an issue here? How much rain falls annually? What is the climate type - seasonality of rainfall, temperature patterns etc.? What is the history of water supply in the city?
	• New storage capacity.
	What use could the Santa Catalina mountains be? Why aren't they used? What geological issue affects reservoirs? What climatic issue would affect reservoirs.? What is the purpose of the reservoir storage basins that they do have? How many reservoir stores are there?
	• Water transfers.
	Where does the transferred water come from? Sketch map? Where precisely? How long is the aqueduct? What height does it rise? How much water is delivered? Since when has it operated? What proportion of total supply? What are the quality issues?  How is the water used? What are the sustainability issues? Longer term - what is NAWAPA?
	• Groundwater sources.
	What has happened to the water table and why? (Details) What is 'sustainable use of groundwater? How is recharge increased? What is 'blended' water? What proportion of water comes from groundwater?
	• Desalination
	What kind of special case desalination is applied to water from the CAP? What salinity concentration? Why might desalination may be needed for 'brackish' groundwater? Why is groundwater getting more brackish? What other sources of water may Arizona have to desalinate in the future? What is wrong with desalination generally?
	• Recycling ('Black' or 'Brown' Water) Black water should not be reused in or around the home because of risk of contamination by bacteria, viruses and other pathogens
	What is reclaimed water? How much in 2001 and in 2009?  How many people could it supply? What % of total usage? What is it used for?  (Only drip or flood irrigation with greywater is allowed - why not sprinkler)? How much effluent does Tucson water have access to and what proportion is reused?
	• ‘Grey’ water http://www.azdeq.gov/environ/water/permits/download/graybro.pdf
	Why is this 'double use' of water - from what sources and what sources are not used? Can homeowners do this for themselves? How? How could effluent augment groundwater? What can and can't you use greywater for?
	• Reducing consumption
	What is xeriscape landscaping? What are low-flow plumbing systems? How could Tucson Water encourage water saving? What could 'new growth' be forced to do?
	Tucson - teacher