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• COLORADO RIVER SYSTEM <br />CONSUMPTIVE USES AND LOSSES <br />REPORT <br />1996 -2000 <br />INTRODUCTION <br />The Colorado River System is composed of portions of seven States -- Arizona, California, <br />Colorado, Nevada, New Mexico, Utah, and Wyoming. It has a drainage area of about <br />242,000 square miles and represents about one - fifteenth of the area of the United States. <br />This report incorporates annual estimates of consumptive uses and losses of water from the <br />system from 1996 through 2000. Wherever available, water use reports prepared in <br />accordance with legal requirements concerning the operation of the Colorado River were <br />utilized. Base data needed to estimate onsite consumptive uses were taken largely from <br />existing reports and studies and from ongoing programs. Where current data were not <br />available, estimated values were developed by various techniques and reasoned judgment. <br />In general, methodology followed the techniques normally used within the system for <br />. estimating water use. <br />Nothing in this report is intended to interpret the provisions of the Colorado River Compact <br />(45 Stat. 1057), the Upper Colorado River Basin Compact (63 Stat. 31), the Water Treaty of <br />1944 with the United Mexican States (Treaty Series 994; 59 Stat. 1219), the decree entered <br />by the Supreme Court of the United States in Arizona vs. California, et al. (376 U.S. 340), <br />the Boulder Canyon Project Act (45 Stat. 1057), the Boulder Canyon Project Adjustment Act <br />(54 Stat. 774; 43 U.S.C. 618a), the Colorado River Storage Project Act, (70 Stat. 105; 43 <br />U.S.C. 620), or the Colorado River Basin Project Act (82 Stat. 885; 43 U.S.C. 1501). <br />AUTHORITY <br />The authority for this report is contained in Public Law 90 -537, the Colorado River Basin <br />Project Act of 1968. Title VI, Section 601(b)(1) of the Act reads as follows: <br />(b) The Secretary is directed to: <br />(1) Make reports as to the annual consumptive uses and losses of water from the <br />Colorado River System after each successive 5 -year period, beginning with the 5 -year <br />period starting October 1, 1970. Such reports will include a detailed break down of the <br />beneficial consumptive use of water on a State -by -State basis. Specific figures on <br />quantities consumptively used from the major tributary streams flowing into the Colorado <br />River shall also be included on a State -by -State basis. Such reports will be prepared in <br />