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<br /> <br />OD215S <br /> <br />. <br /> <br />- variable export numbers <br /> <br />- number of rules to use in allocating the water <br />(maximum number is 5) <br /> <br />Each rule is referenced by an integer rule number. The distri- <br />bution of water among the variable exports is specified by <br />percentages on the rule card. Associated with the rule is a <br />constraint volume which represents the upper limit for applying <br />the rule. The first increment of water to be allocated up <br />to the constraint volume for the first rule is done so using <br />percentages for the first rule. The second increment of water, <br />corresponding to the difference between the second and first <br />rules constraint volumes, is allocated using percentages for <br />the second rule. The process carries up to the last rule. <br /> <br />. <br /> <br />In applying the rules, water is allocated by successive rules <br />until the entire amount is either allocated or the last constraint <br />volume is exceeded. Thus, the program chains through successive <br />rules, starting with Rule No.1. To illustrate, consider the <br />fOllowing example in which three variable exports are to receive <br />water using four rules: <br /> <br />Rule <br />No. <br /> <br />Constraint volume <br />(1,000 acre-feet) <br /> <br />Percent allocation to variable export <br />123 <br /> <br />1 <br />2 <br />3 <br />4 <br /> <br />10 <br />SO <br />90 <br />ISO <br /> <br />20 <br />20 <br />SO <br />o <br /> <br />30 <br />SO <br />SO <br />o <br /> <br />SO <br />30 <br />o <br />100 <br /> <br />If the quantity of water to be allocated were 100 (1,000 acre- <br />feet), application of each rule results in the following values <br />for each export: <br /> <br />Rule Quantity allocated to each export (1,000 acre-feet) <br />No. 1 2 3 Total <br />1 2 3 5 10 <br />2 8 20 12 40 <br />3 20 20 0 40 <br />4 0 0 10 10 <br />Total 30 43 27 100 <br /> <br />. <br /> <br />2-15 <br /> <br />