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<br />1.8Sft <br /> <br />" <br /> <br />8.5 Ooerations Analysis <br /> <br />For the purpose of describing the operations of the Fo~t Lyon Water Bank (FLWB), a twelve month <br />period commencing on March 15th will be used. Management of many elements of the Arkansas <br />River system of Colorado focus on this date, most notable of which is the ending of the winter water <br />storage program (84CW179) and the beginning of direct diversions under the run-of-the-river water <br />right priority administration. Normally, diversions to Fort Lyon Canal Company (FLCC) <br />shareholders commence on March 15th through the main headgate and diversions to FLCC storage <br />reservoirs through the Fort Lyon Storage Canal (storage canal) cease. For illustrative purposes, the <br />initial size of the FLWB is 7,384 af C.D. per yea~ of consumable yield attributable to 5,814 <br />participating shares. If delivered to the river as a \Iniform, constant demand, 5,000 af C.D. is <br />equivalent to 6.9 cfs. The following are sources of w~ter for the water bank: <br /> <br />"Deferred" diversions at the main headgate and the storage canal headgate: water <br />attributable by detailed accounting to FLCC shareholders participating in the water <br />bank, i.e., water normally delivered to the designated shareholders, which is left in <br />the river for diversion elsewhere, pursuant toa rental agreement with the FLWB. <br /> <br />Water leased prior to March 15th and held in $torage: water purchased from FLCC <br />or its shareholders (or others, as needed) anp placed in contract space in Pueblo <br />Reservoir and Adobe Creek Reservoir. <br /> <br />Operations, accounting practices and decision making for the FLWB must be carried out on a daily <br />basis and must be compatible with the current cooperative administration practices on the river as <br />part of the substitute water supply plan or appropriate water rights adjudication. The examples of <br />water bank operations included herein are presented, as monthly summaries of daily operations in <br />acre feet (at) or instantaneous flow rates in cubic feet per second (cfs). Determination of divertable <br />yield from water bank participants is addressed first. T/ten the development of delivery requirements <br />is addressed. To keep the river whole and avoid injury to other water rights, quantification and <br />accounting of transit losses, return flow obligations, storage management and evaporation losses, and <br />carriage considerations inside the FLCC system must be analyzed and computed on a daily basis. <br />Land fallowing requirements placed upon participating shareholders also affect return flows. All of <br />these elements are addressed in the following paragraphs. An operational schematic of the FLCC <br />is presented in Figure 8.2. <br /> <br />Diversions and Transferable Yield <br /> <br />Transferable yield is defined as diversions less ~eturn flows to the river less adjustments. <br />Adjustments such as the consumable loss in the main canal and laterals are computed to protect <br />FLCC operations and non-participating shareholders. Yield is the consumptive use portion of the <br />diversion less the adjustments. The components of the historical annual average diversions are <br />summarized in Table 8.1 from the analysis in Chapter 3. The value for transferrable yield in Table <br />8.1 is an estimate based on the work completed by Boyle. The percentages in Table 8.1 were <br />calculated. For example, the percentage of return flows was calculated as follows: <br />I <br />, <br />% = 60,088af x 100 = 26.96% <br />222,919af <br /> <br />8-14 <br />