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R2gLk 13 <br />Exp�ospive fPopWate®n (Ormruth on Arid Areas <br />Some areas in the Western United States receive less than one -fifth of the <br />annual precipitation that other areas of the country enjoy. Adding explosive <br />urban growth to existing uses in these areas increases pressure on a limited <br />resource — water. <br />Average Inches of Annual Precipitation <br />in the United States 1961 -1990 <br />lr, <br />- I � <br />h , <br />Source: USDA- NF3CS: http:// www.hw.nres.usda.gov /prism.himl <br />N <br />S <br />a <br />Average Annual <br />Precipitation <br />0 - 5 Inches <br />p 5 -10 <br />10- 15 <br />15 -20 <br />20-25 <br />25-30 <br />30-35 <br />35-40 <br />40-45 <br />45-50 <br />50 -60 <br />60-80 <br />80- 100 <br />100-200 <br />