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<br />r <br /> <br />. <br /> <br />. <br />i <br /> <br />. <br /> <br />d <br /> <br />Perennial streams in the area have their headwaters at high elevation. <br />In the northern part of the Arkansas River upstream from Salida, most western <br />tributaries originate in the Collegiate Peaks of the Sawatch Range. Texas and <br />Grape Creeks flow from the crest of the Sangre de Cristo Range. Fourmile, <br />Beaver, and Fountain Creeks originate on the slopes of Pikes Peak, another <br />14,000-foot mountain. Hardscrabble Creek and the St. Charles River originate <br />in the Wet ~ountains, with headwaters above 9,000 feet and 11,000 feet. The <br />Huerfano, Apishapa, and Purgatoire Rivers have their headwaters in the Culebra <br />Range. These streams all are sustained by mountain snowpack. Northern tribu- <br />taries of the Arkansas River downstream from Pueblo, Colo., originate on the <br />Colorado Piedmont and are ephemeral, as are smaller southern tributaries <br />between, or tributary to, the major southern perennial tributaries. Mean <br />annual runoff decreases from more than 30 inches from the mountain peaks to <br />less than 0.1 inch from the Colorado Piedmont, downstream from Pueblo <br />(fig. 4). <br /> <br />EXPLANATION <br /> <br />-0.5- <br /> <br />LINE OF EQUAL MEAN <br />ANNUAL RUNOFF-Interval. <br />In Inches. is variable <br />BASIN BOUNDARY <br /> <br /> <br />,,,.,,r <br /> <br />z <br />: <br /> <br />.0 <br />~..01.0 <br />~"i'r <br />~~. <br />~- <br /> <br />\ <br />~" c... <br />~. <br />'J <br />( <br /> <br />., <br /> <br />I"" ~.. <br />I ,/ ~ " , ( ~ <br /> <br />ei'S :;:- <br />.../ <br /> <br />'-. <br /> <br />..--- <br /> <br />:H~' <br /> <br />~ <br />.~ <br />.~ <br />I~ <br />''''~ <br />",~^-- <br />\\~' <br />?-' ) <br />! '-..-.. --- <br />,..-.../i .. ~. <br />/" From US Geological <br />Survey. 1970 <br /> <br />o <br />I <br />o <br /> <br />25 <br /> <br />75 MILES <br />, <br /> <br />50 <br /> <br />, <br />25 <br /> <br />, <br />50 <br /> <br />I' <br />75 KILOMETERS <br /> <br />Figure 4.--Mean annual runoff. <br /> <br />7 <br />