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104° _ <br />o Crowley <br />I County I' <br />105 w ARKANSq i <br />Pueblo �i' 1 <br />Pueblo <br />County <br />a <br />38° <br />105° <br />Q <br />EXPLANATION ` \� <br />• Irrigation well \ _ <br />104° <br />i <br />unta Las Animas <br />Prowers v Otero �d`�Bent County ��5 County <br />7La <br />g County I 6° 1 x <br />�tuo - Oil <br />103° <br />0 10 20 30 40 50 MILES <br />0 10 20 30 40 50 KILOMETERS <br />Figure 1. Map showing location of study area and irrigation -wells used in the study, 1997 -98. <br />This executive summary describes the results of the comparison of the two approaches. Specifi- <br />cally, (1) the differences in instantaneous discharge measured with three portable flowmeters and <br />measured with an inline TFM are evaluated, and the statistical differences in paired instantaneous <br />discharge between the two approaches are determined; (2) short- and long -term variations in the PCC's <br />are presented; (3) differences in pumpage between the two approaches are evaluated, and the statistical <br />differences in pumpage between the two approaches are determined; (4) potential sources of discrepancy <br />between pumpage estimates are discussed; and (5) differences in total network pumpage using the two <br />approaches are presented. <br />During the irrigation seasons of 1997 and 1998, instantaneous discharge and electrical power <br />demand were measured at randomly selected wells to determine PCC's. At more than 100 wells, the <br />PCC's determined during the 1998 season were applied to total electrical power consumption data that <br />was recorded between the initial and final readings at each network well site in 1998 to estimate total <br />ground -water pumpage. <br />At each site, an inline TFM was installed in a full- flowing, acceptable test section of pipe on the <br />discharge side of the pump where the measurement of discharge was made. Measurements of instanta- <br />neous ground -water discharge also were made using three different types of portable flowmeters. The <br />2 Comparison of Two Approaches for Determining Ground -Water Discharge and Pumpage in the <br />Lower Arkansas River Basin, Colorado, 1997 -98 <br />