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<br />Salinity Data <br /> <br />The salinity data used in the study consisted of monthly salt load <br />~alues corresponding to each flow ~alue contained in the hydrologic <br />traces. <br /> <br />Discussion of Strategies <br /> <br />Base Case <br /> <br />Release decisions are made for only 1 month at a time. The base case <br />is the basis against which the alternative operating strategies are <br />compared. The main concept in the base case is to maximize water con- <br />servation by keeping the reservoirs as full as possible without <br />violating flood control criteria or without shorting downstream water <br />users. The base case accomplishes this by releasing water to meet <br />downstream user needs and additional releases as may be required by <br />flood control criteria. <br /> <br />Under the base case, surplus deliveries to CAP and MWD come entirely <br />from unscheduled flood control releases. The flood control releases <br />from Lake Mead are distributed equally to CAP and MWD. !f one of <br />these two users reaches its maximum capacity, the other user may use <br />any remaining flood control releases up to its maximum monthly <br />capacity. After this, any remaining flood control releases are wasted <br />to the Gulf of California or are diverted for Mexican uses, if <br />possible. <br /> <br />Alternative Operating Strategies <br /> <br />The alternative operating strategies predict surplus releases and <br />schedule the surplus deliveries over a period of time. This surplus <br />water can then be used to make additional deliveries to water users, <br />to generate power, to provide for more consistent recreation uses, and <br />to reduce unscheduled flood control releases. <br /> <br />The alternative strategies developed were based on the concept of <br />ending the water year at or below a maximum contents le~el with fewer <br />unscheduled flood control releases. This maximum level was defined by <br />the amount of system space predicted on October 1 to be needed the <br />following year. <br /> <br />The basic philosophy behind these new strategies is an attempt to <br />schedule surplus releases early to derive the maximum benefits. The <br />scheduled surpluses are, of course, constrained by the Operating <br />Criteria. All of the new strategies attempt to schedule the surplus <br />releases in a pattern that will enhance the o~erall operation while <br />maintaining a balance between conflicting priorities. <br /> <br />6 <br />