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<br />Chapter II <br /> <br />THE HYDROLOGIC AND HISTORIC SETTING <br /> <br />The hydrologic characteristics of the Upper <br />Colorado River Basin are reviewed. They explain in <br />part the interest in and the potential for weather <br />modification in this area. Certain aspects of the <br />precipitation management program in the Upper Colorado <br />River Basin are discussed briefly. <br /> <br />1. The Upper Colorado River Basin. The Upper <br />Colorado River Basin (Fig. 1) covers parts of the <br />states of Colorado, Wyoming, Utah, New Mexico, and <br /> <br />Arizona. It comprises 109,500 square miles above <br />Lees Ferry, Arizona, its boundaries extending along <br />the continental divide in the east and the north and <br />along the divide of the mountain range through Utah in <br />the west. The Colorado River, which is the third <br />longest river in the United States, has a length of <br />1,450 mi les . I t has its source in the high, snow- <br />capped mountains in northwestern Colorado. It is also <br />fed by major tributaries originating in other parts <br /> <br />~. <br /> <br /> <br />o <br />CHEYENNE <br /> <br />Shadow MI <br />R" <br />GronbyRes <br /> <br />C? <br />DENVER <br /> <br />" ~ <br />'9 ~ <br /> <br />I <br />l, <br /> <br />lZJ <br />~ <br /> <br />EXPLANATION <br />Irrigated Land <br />Irrigated Land, To be Furnished <br />Supplemental Waler <br />New Land <br />EXisting Reservoir and Lakes <br />Initial Participating Projects <br />Other Participating Projects <br /> <br />25 <br /> <br />"iCA LE <br />o 25 <br /> <br />~mlle' <br /> <br />I:i.'!i.>'iI <br />= <br />@ <br />o <br /> <br />Fig. 1. The Upper Colorado River Basin (after Upper Colorado River <br />Commission [7]) <br /> <br />3 <br />