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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />March 1996 Final <br /> <br />and 75 percent for sole source center pivots. The depletion factors for municipal and <br />commercial pumping depend on the particulars of the uses. In addition, the Amended Rules <br />and Regulations will require LAWMA to replace depletions to Usable Stateline Flow to the <br />extent that such depletions are not made up from the replacements to Colorado surface rights. <br />For LAWMA, the main stem irrigation, municipal, and commercial pumping averaged 78,616 <br />acre-feet during 1990~94 after certain non-consumptive and "alternate-point-of-diversion" <br />pumping was subtracted. Of this total amount, averages of 41,893 acre-feet affected the <br />river above the Buffalo Canal headgate and 36,723 acre-feet affected the river below the <br />Buffalo Canal headgate. All but an average of approximately 61 acre-feet annually was <br />pumped for irrigation. <br /> <br />The well depletions shown in Table 8 were calculated using the presumptive stream <br />depletion factors described previously and distributed among river segments according to the <br />locations of the wells. The well depletions above the Buffalo Canal headgate averaged 9,099 <br />acre-feet annually. Approximately 2,855 acre-feet of this total affected the river above the <br />Lamar Canal headgate and would need essentially full replacement under the Amended Rules <br />and Regulations. Not all the remaining 6,244 acre-feet of well depletions would require full <br />replacement to Colorado surface rights however. When the irrigation demand in the Buffalo <br />Canal system is satisfied from river flow without a call against upstream water rights, which <br />happens during fairly long periods in most years, the well depletions between the headgates <br />for the Lamar and Buffalo Canals have affected the diversions into the X-V Irrigating Ditch or <br />Manvel Canal. This is the way the Colorado priority system works; the well depletions in this <br />segment at any particular time affect the junior water right that is not completely satisfied. <br />Since LA WMA will control these two water rights and since their actual yield will be <br />determined by the gaged flow at Granada, LAWMA will replace these well depletions to these <br />two water rights automatically by having their yield reduced. <br /> <br />The historical depletions to Usable Stateline Flow were estimated using the results of <br />the Kansas H-I Model with the Durbin usable flow method and Larson coefficients. This <br />model and usable flow approach is recognized in the Amended Rules and Regulations for this <br />purpose. These results indicated that depletions to Usable State line Flow from LAWMA's <br />1990-94 pumping amounted to 7,976 acre-feet per year. It needs to be emphasized here that <br /> <br />11 <br />