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<br />six variables previously identified and included in various computations <br /> <br /> <br />in our studies are more fully described below: <br /> <br />Upper Basin Storage Reserve <br /> <br />We have studied five different storage rules in the Upper Basin which <br />would remain inviolate to the extent streamflow is available subject <br />only to the minimum allowable delivery requirement from Lake Powell. <br />The five storage levels were those amounts required to deliver either <br />7 1/2 or 8 1/4 MAF annually at Lee Ferry during various critical stream- <br />flow periods of record using the following streamflow sequences to define <br />the critical periods: <br />(a) No specific sequence used. No inviolate storage provided. <br />(b) The sixth lowest in a 63 event sequence having an estimated <br />probability of being exceeded 90.5% of the time. <br />(c) The third lowest in a 63 event sequence having an estimated <br />probability of being exceeded 95.2% of the time. <br />(d) The lowest in a 63 event sequences having an estimated <br />probability of being exceeded 98.4% of the time. <br />(e) Storage requirement defined under (d) above to which was added <br />the amount of storage between the dead storage level and the <br />minimum' power level in Upper Basin Reservoirs. (Identified on <br />Table as 98.4+%). <br /> <br />The values of Table 2 (4 sheets) indicate the effect of these rules on <br /> <br />various items. <br /> <br />7 <br />