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<br />,I II 'I <br /> <br />t;:\~~Ii+ SURPLUS GUIDELINES APPENDIX <br /> <br />COLORADO RIVER WATER MANAGEMENT/PLANNING STUDY <br />(C R W M P S) <br /> <br />SURPLUS DETERMINA nON STUDIES <br /> <br />12/23/93 <br /> <br />The Bureau of Reclamation (Reclamation) has been working with the Colorado River <br />Management Work Group (Work Group) on the Colorado River Water Management/Planning <br />Study, (CRWMPS), to examine the administration and management of the Colorado River. <br />This study has been examining the effect of alternate provisions for determining surplus, <br />normal and shortage conditions. The primary purpose of this study has been to develop <br />operating scenarios which addresses specific concerns of the individual Basin States and <br />provide a basis for establishing consensus among the Basin States on the strategy for future <br />Secretarial determinations. Following several months of analysis the Work Group asked <br />Reclamation, at the May, 1993 Work Group meeting, to develop an initial proposal for a <br />surplus methodology. This report documents the analysis and initial proposal by Reclamation <br />regarding the surplus determination methodology for use by the Lower Division. <br /> <br />INTRODUCTION <br /> <br />For the first time, in 1989, the Lower Division States fully utilized their <br />7.5 million acre-feet (mat) apportionment when measured as diversions less determined <br />return flows. With 1990 requests for water by the Lower Division States exceeding 7.5 maf, <br />the Lower Division States entered an era of limits in which a "normal" water year supply <br />would not always satisfy all the requested diversions. In response, Reclamation increased <br />emphasis on monitoring the deliveries and uses to assure that the Lower Division States do <br />not exceed their 7.5 maf apportionment in "normal" years. In addition, Reclamation initiated <br />comprehensive operating studies to examine the administration and management of the <br />Colorado River. These studies are presented here to analyze the effect of alternate <br />provisions for determining surplus, normal and shortage conditions, and address the levels of <br />risk for such determinations. <br /> <br />STUDY PURPOSE <br /> <br />The objective of this study was to examine long range strategies to better define Colorado <br />River management alternatives that will improve the basis for system operating decisions and <br />determinations. The study has focused on defining criteria for determining surplus, normal <br />and shortage conditions for the Lower Colorado River which are required in the 1964 <br />Arizona versus California Supreme Court Decree. During this last year, the study has <br />concentrated on addressing surplus determinations. <br /> <br />7 <br />