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<br />(3) storage of water not required for the releases specified in' <br /> <br />clauses (1) and (2) of this subsection, to the extent that the Secretary, <br /> <br />~ after consultation with the Upper Colorado River Commission and representatives <br /> <br />of the three Lower Division States and taking into consideration all <br /> <br />. <br />'r.-'" <br /> <br />relevant factors (including, but not limited to, historic streamflows, the <br /> <br />most critical period of record, and probabilities of water supply), shall <br /> <br />find this to be reasonably necessary to assure deliveries under clauses (1) <br /> <br />and (2) without impairment of annual consumptive uses in/the Uoper Basi~ <br /> <br />pursuant to the Colorado River Compact: Provided, That water not so reauired <br /> <br />to be stored shall be released from Lake Powell (i) to the extent it can be <br /> <br />reasonably applied in the States of the Lower Division to the uses specified <br /> <br />a....u\:'" ~ q,fr"ovJ,\...rc.\ <br />in article III (e) of the Colorado River Compact, but no such releases shall <br /> <br />be made when the active storage in Lake Powell is less than the active storage <br /> <br />in Lake Heade, (11) to maintain, as nearly as practical, active storage in <br /> <br />Lake Meade equal to the active storage in Lake Powell, and (iii) to avoid <br /> <br />anticipated spills from Lake Powell." <br /> <br />During the work of formulating the Long-Range Operating Criteria that took ~ ';, <br /> <br />place in 1969 and 1970, considerable effort was devoted to studies to define~ <br /> <br />the storage which has been called "607.(a) storage," that would be required <br /> <br />70S ~S <br />to allow the Upper Division States to develop their use of III (a) water <br /> <br />'. <br /> <br />under the Colorado ~iver Compact without any impairment from the obligation <br /> <br />-, <br /> <br />of delivering water for the Mexican Treaty, as provided under article III (c) <br /> <br />. . <br /> <br />of the Compact, and delivering the 75 million acre-feet every 10 years under <br /> <br />,,' <br /> <br />article IIl(d) of the Compact. Although some 146 simulation studies were <br /> <br />made of the system for the years 1970 through 2000, a consensus was not <br /> <br />l <br />