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<br />released from Lake Powell. <br />equalization with Lake Mead <br /> <br />Additional flows were <br />and to avoid spills. <br /> <br />released when required for <br /> <br />Lake Mead was operated so as to release wate~ only to met downstream delivery <br />requirements, or to meet the requirements of the U.S. Army Corps of Engineers <br />Flood Control Regulations. Because of the simplicity of this study, no <br />provisions were made for scheduled deliveries to Mexico of more than 1.5 <br />million acre-feet per year. <br /> <br />~Flood control releases from Lake Mead were identified where hydrologic <br />vzs~narios were sufficient to produce them. For those hydrologic scenarios <br />~ ~~ich did not produce a flood control release for the five year period, the <br />~' ~ initial contents of Lake Powell and Lake Mead were adjusted until a release <br />~~ ~ was triggered. This identified the ,nitia1 contents require 1n La eS Powell <br />~~ and Mead in order to generate a flood control release, under each selected <br />~ hydrology scenario, and thereby produce water which was surplus to the system. <br /> <br />~ <br /> <br />VII. Results <br /> <br />./ <br />~E'(,' <br />oi~'(; <br />~,V. <br /> <br />(, <br /> <br />The outcome of this study indicate that the meth~~and software perform as <br />contemplated. When the operating criteria is a~uniformly and demands are <br />consistent, the Colorado River system is driven by the amplitude of the <br />assumed hydrology and initial conditions. Therefore, th~~y of a <br />flood control release under CULrent reservoir conditions LS lrectly related <br />to the magnitude of the assumed hydrology. A flood control release under <br />current reservoi~ conditions does not occur until the assumed 5 year hydrology <br />approaches 90% probability of nonexceedence. <br /> <br />In order for a flood control release to be made at Lake ~lead under the minimum <br />.probable 5 year hydrotogic scenarios, the Lake Powell and Lake Mead mU,st be <br />initially full. Under such conditions, a small flood control release would be <br />made in January, 1992, then the reservoir system would be continually drawn <br />down until the end of the study. Under a 25% hydrology Lake powell and Lake <br />Mead must also begin almost full to generate a flood control releas~. At 50% <br />and 75% hydrologys, the initial reservoir contents must be adjusted above <br />current conditions in order force a flood control release within the 5 year <br />study period. <br /> <br />A summary of end of study surface storages at Lake Powell and Lake Mead are <br />listed below for selected hydrologic probabilities. For hydrologic <br />probabilities of 5%, 25%, 50%, and 75%, the summary includes end of study <br /> <br />4 <br />