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8-22-05 <br />Cook Evaluation of <br />Wyoming New Depletion Plan <br />Overruns and Under Runs <br />Downstream Routing <br />And <br />Use of Under Runs to Offset Overruns <br />Baseline 1 <br />Baseline 1, Under Runs Above Pathfinder (Subbasin 1) <br />Assumption: <br />? Under runs in this subbasin 1 will result from lack of water supply in the <br />subbasin. <br />Conclusion: <br />While under runs in this subbasin generally do not contribute to overruns in <br />subbasin 2(Pathfinder to Guernsey) the primary effect of the water use in <br />Baseline 1, whether in subbasin 1 or subbasin 2, is to impact storage for the <br />North Platte projects. Therefore use of an under run in subbasin 1 to offset an <br />overrun in subbasin 2 is acceptable. However, it is inappropriate and to <br />Wyoming's disadvantage to use the tracking tables in Attachment 1 to route a <br />subbasin 1 under run to subbasin 2. There are no foregone diversions that <br />result from under runs. All under runs for which routing is appropriate should <br />be routed using normal conveyance losses only. <br />Baseline 1, Overruns Above Pathfinder (Subbasin 1) <br />Assumptions: <br />? Overruns are not likely to occur in this area in allocation years because any <br />such excess use could typically happen only when water supplies that year are <br />very good. A possible exception would be the first wet year following one or <br />more allocation years. <br />An overrun in a non allocation year will either (1) reduce storage in <br />Pathfinder, thereby reducing use of storage water in Wyoming or Nebraska in <br />a subsequent year; (2) reduce natural flow use in Wyoming or Nebraska in <br />the same year; or (3) cause a system spill to either be delayed or reduced in <br />amount in that year or in some subsequent year. To the extent the reduction is <br />to natural flow use by North Platte project contractors in Nebraska or <br />Wyoming, it will be made up through release of additional storage water and <br />will not cause an overall reduction in use or in the total amount of water <br />crossing the state line that same year. Any reduction to natural flow use <br />downstream in Wyoming by other than North Platte project contractors will <br />be the direct consequence of the upstream overrun.