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Estimation of Total Network Pumpage <br />Differences in the total or aggregated pumpage for a network of wells was estimated by dividing <br />the range of TFM pumpage into equal subdivisions based on the magnitude of TFM total pumpage. <br />Because the correct number of subdivisions (strata) is not known with information now available, the <br />mean and standard deviation of differences in the total pumpage was determined conditionally for <br />several numbers of strata. For a network of 103 wells and a number of strata greater than 10, the <br />resulting mean and standard deviation indicates that, for any given year, there is a 95- percent probability <br />that the difference in aggregated pumpage between the TFM and PCC approaches would be between <br />about -3.41 and 1.59 percent. The analysis indicates that the difference in aggregated pumpage would be <br />expected to be smaller as the total number of wells becomes larger. <br />Comparison of Two Approaches for Determining Ground -Water Discharge and Pumpage in the <br />Lower Arkansas River Basin, Colorado, 1997 -98 <br />