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<br />"'~II'" 33 <br />I} L> ~;, '1. ' <br /> <br />June 30, 1993 <br /> <br />Gunnison Planning Model - Info Theme No. 10 <br /> <br />Information Related to Colorado River Compact Requirements <br /> <br />1. Amounts. Users will have to specify Compact requirements by <br />editing a 12 X 40 table, identical to a non-agricultural demand <br />table. Amounts will be in AF. The default in both the Baseline <br />and Historical Scenarios will be all zero amounts. <br /> <br />2. Network Implementation. A special demand will be situated at <br />the farthest downstream node in the network. The demand will <br />have a single "gate" and a DEMN arc. The table of amounts will <br />be set as the "highs" on the DEMN arc. The rank of the DEMN <br />arc will be some fixed value greater than zero, but it shouldn't <br />matter how high it is. Whenever the high on the DEMN arc for <br />a month is non-zero, then a final solution step will be made in <br />which the same amount will be set as the capacity on a special <br />release gate at Blue Mesa and the gate on the demand arc will be <br />set open. <br /> <br />3. Output. Since all other" diversion" gates will be closed or <br />frozen at previously computed values during the Compact release <br />step, we might assume that the Compact requirement has been <br />met if the release is made from Blue Mesa Reservoir. Therefore, <br />"shortages" in meeting Compact requirements might be <br />determined by comparing the high and flow on the release arc. <br />(Theoretically, the only obstacle which should be able to intercept <br />such a release would be out-of-priority storage in a user-specified <br />new reservoir downstream from Blue Mesa, which could only <br />occur if the outlet works of the new reservoir were already <br />discharging at capacity and the reservoir were not yet full.) An <br />alternative approach would be to check on the successful <br />"delivery" of the Compact requirement to the demand by setting <br />the "low" on the excess outflow arc to its last-computed "flow" <br />and then checking after the final solution step to see whether the <br />Compact DEMN arc had been able to pull the additional amount <br />out of the network or whether it showed a shortage. A problem <br />with this approach is that the final solution step may combine an <br />attempted Compact release from Blue Mesa with other <br />miscellaneous clean-up, which could create additional outflow <br />from the basin even though a Compact release from Blue Mesa <br />was not possible. A foolproof method might be to check both <br />types of "shortage" and report the larger. <br /> <br />.;0;. <br /> <br />,..~.-:.,..""" ,'--"'"- '-< ,', <br /> <br />.,,~,-_~'..;k_,:~ -_: <br />