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<br />002J2~ <br /> <br />Basic Concepts <br /> <br />Monthly Computations <br /> <br />(I) <br /> <br />3.10 Monthly Computations <br />At the beginning of each month, estimate the end-of-month contents for each reservoir. On <br />the fust iteration, use the target content; on later iterations, use the interim computations to <br />refine the estimate. Use the mean of the beginning and ending contents to determine <br />evaporation, surface elevation and seepage. <br />Introduce the runoff and/or local flow, and all return flows delayed from previous months; <br />allow the water to run freely to the end of the basin. <br />Sort the natural right diversions by priority date, and work through the list attempting to <br />satisfy the requirements. Return flows (natural) are available to satisfy earlier diversions <br />which may be short. <br />. Sort the project right requirements by priority date, and work through the list attempting to <br />satisfy them: first, attempt to appropriate project flow, then attempt to appropriate natural <br />flow, then attempt to release water from control reservoirs. Return flows are available to <br />satisfy earlier project requirements which may be short. Reservoir releases for IFR's and <br />power are available for diversion as soon as they have served the purpose for which they were <br />released. <br />Attempt to release any excess water (above maximum content) from the reservoirs. If there is <br />any release, and if there are any unsatisfied project demands, go back to step (4). <br />Attempt to collect any surplus water (up to maximum content) in the reservoirs. <br />Perform the pool maintenance routine. If this results in any releases, and if there are any <br />unsatisfied project demands, then try to use the releases to satisfy the shortages. <br />Examine the end-of-month content at each reservoir. If the mean content of each reservoir is <br />within four acre-feet of the initial estimate, the month is done; otherwise go back to step' (I) <br />and repeat the process. <br /> <br />(2) <br />(3) <br /> <br />(4) <br /> <br />(5) <br />(6) <br />(7) <br />(8) <br /> <br />Page 22 <br /> <br />March 25, 1991 <br /> <br />HYDROSS 4.1 <br />