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<br />Acknowledgments <br /> <br />. <br /> <br />A report of this nature requires information and cooperation from many <br />people. The author would like especially to thank the following: Ralph <br />Adkins and Joseph Mahaney, CF&I Steel Corporation; Roger L. O'Hara, Pueblo <br />Board of Water Works; James Fernandez, City of Trinidad Department of Utili- <br />ties; Edward Martinez, Colorado Springs Department of Utilities; Carmel A. <br />Garlutzo and Patricia Hines, Purgatoire River Water Conservancy District; <br />Charles L. (Tommy) Thomson, Southeastern Colorado Water Conservancy District; <br />Thomas A. Gibbens, Fryingpan-Arkansas Project; Jack McCullough, Twin Lakes <br />Project; and Raymond Harriman, Walsenburg Water Department. Thanks also go to <br />Robert Jesse, Division Engineer Colorado Water Division 2, and to James F. <br />Kasic and Kenneth Cooper, Assistant Division Engineers, William Howland, Engi- <br />neering Technician II, and Thomas C. Simpson, Hydrographer. The following <br />Water Commissioners were extremely helpful: Robert Ermel, Water District lO; <br />Bruce Smith, Water District ll; George Wichmann, Water District l2; Donald K. <br />Stuart, Water District l3; George Ridenour, Water Districts l4 and l5; Robert <br />Brgoch, Water District 16; Donald L. Taylor, Water District l7; Leonard Tru- <br />jillo, Water District l8; Henry D. Marquez, Water District 19; Lane Hackett, <br />Water District 67; and Augustine Garcia (deceased), Water District 79. The <br />author is solely responsible for any errors found in this report. <br /> <br />GEOGRAPHIC SETTING <br /> <br />Population <br /> <br />Population in the area was determined by the 1980 census (U.S. Bureau Of. <br />the Census, 1980) to be 567,000, or almost 20 percent of the total population <br />of Colorado. Most of the population is located along the base of the <br />mountains in two counties: El Paso County (55 percent), and Pueblo County <br />(22 percent). Much of the remainder of the population is concentrated along <br />the Arkansas River. <br /> <br />Physiography and Climate <br /> <br />The physiographic setting of the study area has been described by <br />Fenneman (l93l). The western part of the basin, approximately west of the <br />l050 parallel, is in the Southern Rocky Mountain Province. East of that line <br />is the Great Plains Province, which is further divided into the Colorado <br />Piedmont, north of a line paralleling, and about 25 miles south of, the river, <br />and the Raton section, south of that line. The Colorado Piedmont is a late, <br />mature to old, elevated plain; the Raton section is a trenched peneplain <br />(fig. 2). <br /> <br />Climate in the study area is affected greatly by differences in eleva- <br />tion. It has been said that "The difference in average temperature between <br />Pikes Peak and Las Animas, 90 miles to the southeast, is about the same as <br />that between southern Florida and Iceland" (Berry, 1959). <br /> <br />. <br /> <br />4 <br />