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<br />Finally, there is evidence to suggest that the PCC method tends to overestimate rather <br />than underestimate pumping. The Monterey County Water Resources Agency compared the <br />use of water meters with the use of power records to estimate ground water extractions. <br />This study documented tests of meters as compared to independent flow measurements using <br />a Collins meter and compared these estimates based on power conversion coefficients. The <br />study states, "[i]t is interesting to note that for this data the Power-use method estimated <br />greater average extractions than the meter method in every circumstance. ...the Power-use <br />method would consistently over-estimate by 20%."14 In a study developed by Longenbaugh, <br />Berryman and Nettles in the South Platte basin, Colorado, it was found that the over- <br />estimation averaged 5 %.15 <br /> <br />Well Tester Certification Program <br /> <br />The 1994 Measurement Rules require that any person performing well tests in the <br />Arkansas Valley for the purpose of certifying the accuracy of totalizing flow meters or to <br />determinate power conversion coefficients be approved annually by the State Engineer. A <br />person may be approved in either of two ways. First, a person may be approved on the <br />basis of education and experience,16 or second, by examination." In both cases, the person <br />must have equipment that can accurately measure flow rates for various systems and that <br />equipment must be maintained in proper working order, with periodic calibration. <br /> <br />.. Canessa, Peter, 1992, A Study of Two Methods for Estimating Gross Ground Water Extractions- <br />Water Meter and Power Records: Monterey.County (California) Water Resources Agency. <br /> <br />" Longenbaugh, R.A., Berryman, A., Nettles, D.A., 1993, Study of Different Equipment and <br />Technologies for Measuring or Estimating the Volume of Water Pumped from Large Capacity <br />Wells, presented at the Ground Water Management District Association 1993 Annual Conference. <br /> <br />,. The minimum qualification based on education and experience requires that the person have <br />formal education in well testing and flow measurements and verifiable experience in conducting <br />flow measurements and power conversion coefficient determination. <br /> <br />17 Certification by examination requires that the person attend a three-day course in well testing, <br />flow measurement, and power conversion coefficient determination. The course is composed of <br />both lecture and actUal field testing of wells using various types of equipment. The final <br />examination consists of testing of actual wells in the field under normal field conditions, the <br />calculation of flow rates, well efficiency and power conversion coefficients utilizing a variety of <br />equipment and preparing the required forms. A passing grade of 70% must be oblained before <br />an individual is certified. The course has been designed and laught by Mr. Robert A. <br />Longenbaugh, a recognized expert in this field. <br /> <br />17 <br />