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<br />.. <br /> <br />records constitute practically the only basic historical information obtainable. "8 The states <br />of New Mexico' and North DakotalO report successful measurement results from the use of <br />power records to estimate pumping. <br /> <br />Baker states that while "... power-consumption values carulot be extrapolated reliably <br />from one well to another...," average power consumption can be determined from a <br />statistical sample so that "... as few as lOO values would produce results accurate to within <br />10% of the !roe average at the 95-percent confidence level. "11 In 1983, Baker further <br />concluded that the method, due to its variability from well to well, cannot be reliably used <br />to estimate total withdrawal based on a small sample of wells and the limitations on the way <br />in which power use was reported.12 Hurr and Litke point out, "[w]here equipment and <br />hydrologic conditions are stable, this coefficient [power-consumption] can be applied to total <br />energy consumption at a site to estimate the total ground-water withdrawal". 13 <br /> <br />For these reasons, the State Engineer believes the power conversion coefficient <br />method is reasonable to determine ground water withdrawals in the Arkansas River basin. <br />A PCC is based on the characteristics of a single well and, therefore, is reliable for the <br />determination. Power records are collected by the utility companies independent of the <br />regulatory agencies involved, and the utility companies maintain power meters for accuracy <br />and reliability. Any gaps in power records are minimal. Power consumption data is readily <br />available and can be transmitted electronically from the utility company. Thus, the power <br />consumption data is an excellent source of information to use in determining compliance with <br />the 1994 Measurement Rules and the 1996 Use Rules. <br /> <br />D1ifornia, 1968, Methods for. Estimating Ground Water Extractions in Field Manual for <br />Inspection of Construction and Use of Water: Slate of California, Water Resources Control <br />Board, Division of Water Rights. <br /> <br />. <br /> <br />Brim, Glen, 1995, Personal communication. <br /> <br />10 Lindbig, Milt, 1995, Slate of North Dakola, Office of the Slate Engineer, Personal <br />conununication. <br /> <br />11 Baker, C.H., Jr., 1979, Evaluation of Methods for Estimating Ground-Water Withdrawals in <br />Western Kansas: V.S. Geological Survey, Water Resources Investigations 79-92. <br /> <br />12 Baker, C.H., Jr., 1983, Evaluation of Techniques for Estimating Ground-Water Withdrawals for <br />Irrigation in Western Kans~: Kansas Water Office Bulletin No. 26. <br /> <br />" Hurr, R.T., and Litke, D. W., 1989, Estimating Pumping Time and Ground-water Withdrawals <br />Using Energy-Consumption Data: V.S. Geological Survey, Water Resources Investigations <br />Report 89-4107. <br /> <br />16 <br />