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<br />,- <br /> <br />. ;. <br />(/ <br />~9/1 <br />\1 <br />\r1 <br /> <br />, <br /> <br />002820 <br /> <br />e <br /> <br />DRAFT <br /> <br />e <br /> <br />BASE CASE STRATEGY <br /> <br />2.1 Introduction <br /> <br />The purpose of this section is to describe the major features of the <br /> <br />base case operating strategy. The base case is t~e strategy which most <br />closely simulates the current operating strategy for the Colorado River. <br />The base case provides a basis against which the alternative operating <br />strategies may be compared. <br /> <br />2.2 Description <br /> <br />The main concept on which the base case operates is keeping the reser- <br />voirs as full as possible without infringing upon required flood control <br /> <br />_space or shorting downstream users. The base case strategy accomplishes <br />this by operating reservoirs to reach monthly target contents values, if <br /> <br />possible, while maintaining releases to meet downstream needs. <br /> <br />All reservoirs modeled in the system have a set of monthly target con- <br /> <br />tents values called rule curves. As inflow enters a reservoir, it is <br /> <br />added to the reservoir contents. The reservoir release is then computed <br /> <br />and subtracted from the contents in an effort to bring the new contents <br /> <br />to the monthly target contents value while meeting maximum and minimum <br />contents and release constraints. The release is later adjusted if the <br /> <br />reservoir is called upon to meet downstream demands due to a shortage of <br /> <br />water in the river. <br /> <br />Lake Powell and Lake Mead releases have additional requirements. Lake <br /> <br />Powell releases are computed to meet an assumed minimum annual objective <br /> <br />. 1 <br />