USC ENST 320a - Lecture 7 - Water Supply (6 pages)

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Lecture 7 - Water Supply



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Water Supply 02 14 2013 Water budget Balances input output and storage of water in the system Precip Evap Reservoir Defines natural availability of water 90 of Earths water is unavailable for human use Ice caps groundwater usually inaccessible Estimated that the total water available from US will decrease and consumptive use will increase Climate change will change hydrologic cycle for the worst Pollution There is always enough water for the population but it is not where we need it California Enough water from hydrologic cycle but its all in Northern Cal and population is in Southern Cal Water Vapor Main greenhouse gas and CO2 anthropogenic amplifies the effects of water vapor as a greenhouse gas Causes accelerated global warming Causes more less precipitation in certain areas displacement of people Watersheds Large drainage basin highest to lowest point of the basin Includes land vegetation organisms water bodies abiotic Can include anthropogenic things EX La River largest San Gabriel River Malibu Ballona Dominguez Santa Clara last one not majorly altered by humans o All drain into the ocean Bedrock within watershed determine the soil type Know what pollution sources are in water shed to create a cost benefit approach to management Make locals feel as though they have ownership to spread mitigation Physical Extent of area terrain geology hydrogeographic information Steepness will effect hydrology younger mountains more sediment local climate Chemical Total Suspended Solids pH DO nutrients contamination mineralogy of bedrock affects this o Decomposition natural source of waste Biological plants animals threatened or endangered species Largest source of pollution to our oceans storm runoff o Point source where river hits the ocean and non pollution comes from throughout watershed o Soln Collect storm water on campuses and at houses and let it infiltrate into the aquifer the plants clean up pollution o Simply collecting rain water can supply 130k homes for 1 year



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