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<br />II ,/ <br /> <br />data from power companies to the Division of Water Resources. This will allow enhanced <br />enforcement of the 1994 and 1996 rules by aIiowing irrigation-based accounts to be <br />monitored for monthly power consumption. Well owners claiming inactive wells can be <br />easily monitored and those projecting low pumping amounts can be monitored throughout <br />the irrigation season. <br /> <br />Evaluation of 1995 DWR Field Checks of Power Conversion Coefficients <br /> <br />Late in the 1995 irrigation season, during the month of September, staff of the <br />Division of Water Resources randomly selected a group of operating.wells to perfonn a PCC <br />test. The purpose was .to compare the results of this PCC computation with the PCC <br />computation on file with the Division. Conclusions were to be drawn from this comparison, <br />if possible. A total of 54 wells were tested using two teams of testers over an approximate <br />2 week period. <br /> <br />The data from these field tests were compared to the current data on file concerning <br />the determination of the PCC. This comparison showed a variation between the 1995 field <br />tested PCCs and the PCCs on file. Twenty-three (23) of the comparisons are within plus or <br />minus 10% and forty-two (42) are within plus or minus 25%. Twelve comparisons show <br />differences greater than plus or minus 25 %. <br /> <br />An effort was made to determine why the variations on some of these tests were so <br />large. It appears that 9 of 12 tests with a variation of more than plus or minus 25 % can be <br />explained for various reasons, such as installation of a new pump. For the other ranges, an <br />effort was made to compare the total dynamic head (!DH) for each test since this is the most <br />important variable affecting the PCC. In many tests, the TDH, or a major component of the <br />TDH (the pumping level), was not recorded by the testers. Without the TDH or pumping <br />head, it is difficult to determine the reason for the variation of PCCs. The 1994 <br />Measurement Rules are being amended to address this issue. <br /> <br />Currently, the three largest augmentation associations are each using a professional <br />engineer experienced in well testing to conduct power coefficient testing. This should <br />significantly improve the quality of the testing as compared to previous testing by some <br />associations. These associations have the majority of the active large capacity wells in their <br />memberships. <br /> <br />The State Engineer believes the use of the PCC method for determination of pumping <br />volume is a reasonable method for the reasons enumerated in the original report. It will <br />provide data within an acceptable range of accuracy to determine pumping volumes more <br />efficiently and timely than flow meter data, since monthly power consumption records will <br />have to be provided by the power suppliers pursuant to Senate Bill 96-124 (see Appendix A). <br />The method allows for the ability to monitor use and to enforce the 1994 and 1996 Rules. <br /> <br />12 <br />