GEOG 256 10 8 13 Lecture 9 Outline of Last Lecture I Cities and Water Quality II Point and Non Point Pollution III Urban Planning Strategies for Protecting Ground Water IV Hydrology Outline of Current Lecture I Water Supply II Pressures will increase III Tucson Rainwater Harvesting and Recycling Current Lecture I II Water Supply a US Water Withdrawals i Power Plants 49 ii Agriculture 31 iii Public Supply 11 iv Industry Mines 5 b Withdrawal i Use and return to the source 75 c Consumption i Use without return to the source due to evaporation transpiration incorporation into products or tissue 25 d Arizona Figures i Agriculture 70 ii Public Supply 22 iii Industrial 8 e Overall Supply is Abundant i 4 8 Billion acre feet of annually renewable supply ii 68 billion acre feet stored in lakes and groundwater iii The issue is uneven geographical and temporal distribution Pressures will increase a Population growth and shift to semi arid areas b In stream demands minimum flow requirements c Global warming These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III d Energy production e Aging infrastructure f Some issues with overuse i Economic Growth Housing Development ii Recreation fisheries and habitat iii Groundwater over drafting landscapes and subsidence iv Food security and prices Tucson Rainwater Harvesting and Recycling a First in USA 50 of water for landscaping in commercial projects must come from rainwater b Largest reclaimed water system in the US c Water is underpriced i Price should be 1 Cost of Distribution reservoirs treatment systems opportunity cost habitat recreation etc ii Prices lie well below this price so we use more iii A 10 increase in price would decrease water use by about 6 but this differs by income d Inclining block rate structure i Unit price increases as volume increases a way to reward conservation e Incentives i Tucson water will pay you up to 10 000 to upgrade your system ii Las Vegas pays people to get rid of their grass 8 4 million gallons of water saved per year f Smarter Meters