RS 301 - Water Use Lecture Notes

RS 301 - Water Use Lecture Notes - RS 301 Professor Wolf...

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Professor Wolf Cal Poly Pomona Fall 2009 Lecture Notes on Water Use Water quality o National Standards for drinking water o – Regulatory requirements for Maximum Contaminant Levels + Primary standards--legally binding + Seondary standards (taste, smell, color)--recommended but not legally binding o Limits set for biological, inorganic (e.g., metals) and organic contaminants, disinfectants (e.g. chlorine) + Available at http://www.epa.gov/safewater/mcl.html#mcls + Fact sheet at http://www.epa.gov/safewater/hfacts.html Industrial and Agricultural water use * Thermoelectric plants account for 48% of water withdrawals o Nationally, irrigation accounts for 40% of all water use (65% if you don’t include cooling for power plants). + Surface water is 58% of all irrigation (the rest is pumped from wells) + Average application was 2.48 acre-feet per acre + (from http://ga.water.usgs.gov/edu/wuin.html) National water use http://ga.water.usgs.gov/edu/graphics/wateruse2000pie.gif Trends in National Water use http://nationalatlas.gov/articles/water/IMAGES/water_chart1.gif What happens to rainfall * 1/3 goes to surface water * Rest goes to groundwater, evaporation * California gets 2/3 of its water from surface, 1/3 from groundwater (wells) California Water Issues * About three quarters of the state’s precipitation falls north of Sacramento * about 70% of all agricultural and urban water use inCalifornia occurs south of Sacramento * roughly 80% of the state’s precipitation falls between October and March * about three quarters of all the water use in Californiaoccurs in the spring and summer, between April and September * California’s population is expected to grow by an average of about half a million people per year forthe next thirty years or more. * It’s not just about people!
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This note was uploaded on 05/30/2010 for the course RS RS 301 taught by Professor Professorwolf during the Fall '09 term at Cal Poly Pomona.

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RS 301 - Water Use Lecture Notes - RS 301 Professor Wolf...

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