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<br />. <br /> <br />. <br /> <br />CHKPIAN1 assumes a limited operation of the "check" <br />structure, and allows for shared shortages between OMID and <br />GVWUA. Totalling the above shortages gives an approximation <br />of the dry-year Cameo demand for stored water under full river <br />administration. It does not account for additional demands by <br />junior rights upstream. <br /> <br />2. Benefits Using the "Check" <br /> <br />Additional manipulations of the CHKPLAN model resulted <br />in estimates of potential benefits of keeping the "check" in <br />operation. Assuming a bypass channel capacity of 640 cfs <br />(sufficient to carry the entire diversion demand of GVIC), <br />operating the "check" could take the place of 30,800 acre-feet <br />of stored water in supplying the GVIC junior right. If the <br />bypass channel capacity is limited to 580 cfs, the <br />corresponding benefit drops to about 22,000 acre-feet. Such <br />an operation of the "check" and bypass channel is consistent <br />with historic practice (1977 is an example). <br /> <br />The "check" is not effective in taking care of the <br />other shortages listed on Table 2. Those demands can only be <br />satisfied by releases from upstream reservoirs. For example, <br />if the "check" is used to satisfy 30,800 acre-feet of GVIC <br />demand, there remains a Cameo shortage of about 20,600 <br />acre-feet reliant on upstream storage. If effectiveness of <br />the "check" is limited to 22,000 acre-feet, the Cameo demand <br />for upstream storage increases to about 29,400 acre-feet. <br /> <br />- 13 - <br />