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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 />ADEQUACY OF LAWMA'S REPLACEMENT SOURCES <br /> <br />General <br /> <br />This report section refines the conclusions from the July 1995 report with respect to <br />the adequacy of LAWMA's replacement sources. Prior to this discussion, it may be helpful <br />to the readers to briefly review LAWMA's well pumping, pumping depletions, and replacement <br />sources. <br /> <br />Well PumDinQ and PumDina DeDletions <br /> <br />Table 8 summarizes important data relating to LAWMA's average well pumping and <br />pumping depletions during 1990-94 from the July 1995 report. This period was a period of <br />relatively high pumping and was therefore judged to be suitable for assessing the adequacy <br />of LAWMA's existing and proposed supply of replacement water. As described in pages 8-11 <br />of the July 1995 report, pumping estimates for the electrically-powered wells were based on <br />records for the power consumption by the wells and on power coefficients measured in 1993 <br />and 1994. About 88 percent of the irrigation wells were powered by electricity. The <br />remaining irrigation wells were equipped with totalizing flow meters in 1994. The data that <br />were available for these wells were limited to partial readings for 1994. Estimates made for <br />these non-electric wells for 1994 indicated that their pumping amounted to approximately <br />11 .1 percent of the total; this percentage was used also to estimate their pumping for 1990- <br />93. As shown in Table 8, the total pumping averaged 94,590 acre-feet annually, of which <br />80,707 acre-feet was irrigation pumping and 13,882 acre-feet was municipal and commercial <br />pumping; and 91,357 acre-feet was in the main stem area and 3,233 acre-feet was out of the <br />main stem area. <br /> <br />The Amended Rules and Regulations will require LA WMA to replace depletions to <br />Colorado surface rights for depletions from main stem irrigation, municipal, and commercial <br />well pumping, with the amounts of required replacements being calculated using certain <br />presumptive depletion factors. Specifically, these presumptive depletion factors are 30 <br />percent for supplemental irrigation pumping, 50 percent for sole-source irrigation pumping, <br /> <br />10 <br />