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<br />" <br />I., <br /> <br />,I <br /> <br />t <br />I <br />l ! <br />I, I <br /> <br />~,~ <br /> <br />f' <br />I. <br />\ <br />" <br />I <br />"1 <br />" <br /> <br />, <br /> <br />I- <br />I <br />I <br />~, <br />I: <br />" <br />!' <br />!." <br /> <br />i <br />, <br /> <br />'. <br /> <br /> <br />EXPLANA TION <br /> <br />PHYSIOGRAPHIC <br />BOUNDARY <br />_..---- BASIN BOUNDARY <br /> <br /> <br />I04Y"~~&1- <br />, ~...... <br />,.-( "1 <br />-e~5~" \ <br />,../" " <br /> <br />~.. <br />'. <br /> <br />'~39' <br />\ <br /> <br />, <br />~ <br /> <br />(fJ <br />z: <br /><l:j <br /> <br />COLORADO PIEDMONT <br /> <br />)""" MUOlln <br />1<(',\("'"'' <br /> <br />""' <br />An.mo'l'" <br /> <br />,,;.' <br /> <br />~ <br />.< <br />,~ <br />!-..I~ <br />~ <br />'< <br />~ <br />Q:-) <br />S--. <br /> <br />z <br />(fJ <br /> <br />,';--" <br />,/' <br />j' <br />-~.iEwMExlcO --~37' <br /> <br />o <br />I <br />o <br /> <br />25 <br />, <br />, <br />50 <br /> <br />50 75 MilES <br />" , <br />75 KILOMETERS <br /> <br />. <br />25 <br /> <br />Figure 2.--Physiographic setting. (After Fenneman, 1931) <br /> <br />Mean annual precipitation ranges from less than lO inches in the plains <br />part to more than 40 inches at the crest of the highest mountains (fig. 3). <br />Distribution of precipitation with time is uneven; much of the precipitation <br />in the plains is from intense summer storms. Inclusion of tnese storms in the <br />record makes the mean annual precipitation much greater than the mode of the <br />mean daily precipitation. Precipitation in the mountains results in the <br />formation of a deep snowpack that accumulates during winter months, and that <br />melts and runs off in the spring and early summer. Both storm runoff and <br />snowmelt result in a large percentage of annual streamflow occurring during a <br />relatively short time. <br /> <br />5 <br />