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CONTENTS <br />ExecutiveSummary ................................................................................................................................ <br />............................... <br />1 <br />5 <br />Introduction............................................................................................................................................. <br />............................... <br />5 <br />Purposeand Scope ........................................................................................................................ <br />............................... <br />6 <br />Acknowledgments........................................................................................................................ <br />............................... <br />6 <br />Methodsof Investigation ........................................................................................................................ <br />............................... <br />7 <br />Totalizing Flowmeter Measurements ............................................................................................ <br />............................... <br />8 <br />Portable Flowmeter Measurements .............................................................................................. <br />............................... <br />9 <br />Power Conversion Calculations and Computations of Pumpage .................................................. <br />............................... <br />23 <br />QualityControl of Data ................................................................................................................ <br />............................... <br />10 <br />10 <br />Overview of the Statistics Used for Comparing Discharge and Pumpage ................................... ............................... <br />9. Relation of ground -water pumpage from inline totalizing flowmeter to the differences in pumpage <br />Comparison of Instantaneous Ground -Water Discharge Measurements ................................................ <br />............................... <br />11 <br />PrimaryResults ............................................................................................................................. <br />............................... <br />12 <br />12 <br />Detailsof Analysis and Results .................................................................................................... <br />............................... <br />19 <br />Temporal Variations in Power Conversion Coefficients ......................................................................... <br />............................... <br />11. Graph showing relation of the mean and standard deviation of total network pumpage, in percent, <br />Short -Term Variations in Power Conversion Coefficients ............................................................ <br />............................... <br />19 <br />Long -Term Variations in Power Conversion Coefficients ............................................................ <br />............................... <br />21 <br />Comparison of Ground -Water Pumpage Estimates ................................................................................ <br />............................... <br />25 <br />PrimaryResults ............................................................................................................................. <br />............................... <br />25 <br />25 <br />Detailsof Analysis and Results ............. ....................................................................................... <br />............................... <br />30 <br />Sources of Discrepancy Between Pumpage Estimates ........................................................................... <br />............................... <br />PrimaryResults ...............................................................................................................:............. <br />............................... <br />30 <br />31 <br />Detailsof Analysis and Results .................................................................................................... <br />............................... <br />33 <br />Estimationof Total Network Pumpage ................................................................................................... <br />............................... <br />33 <br />PrimaryResults ............................................................................................................................. <br />............................... <br />34 <br />Detailsof Analysis and Results .................................................................................................... <br />............................... <br />38 <br />Conclusions............................................................................................................................................. <br />............................... <br />39 <br />ReferencesCited ..................................................................................................................................... <br />............................... <br />FIGURES <br />1. Map showing location of study area and irrigation -wells used in the study, 1997 -98 ................ ............................... <br />2 <br />2. Graphs showing relation of instantaneous discharge measurements from totalizing flowmeter to the <br />differences in instantaneous discharge measurements between portable flowmeters and totalizing <br />flowmeters, expressed (A) in logarithmic units and (B) in gallons per minute ............................ ............................... <br />13 <br />3. Boxplots showing differences in instantaneous ground -water discharge between portable flowmeters <br />and totalizing flowmeters (A) for the entire network, (B) by portable flowmeter method, (C) by make <br />of totalizing flowmeter, and (D) by type of discharge distribution system, 1997 -98 .................. ............................... <br />15 <br />4 -9. Graphs showing: <br />4. Distribution of differences in instantaneous ground -water discharge between portable flowmeters <br />and totalizing flowmeters for network sites during 1998 .................................................... ............................... <br />16 <br />5. Power conversion coefficients (PCC) determined at network sites during 1998: (A) range in PCC <br />and(B) percent difference ........... ........................................................................................ ............................... <br />6. Seasonal distribution of power conversion coefficients (PCC) for network sites during 1998 .......................... <br />20 <br />22 <br />7. Power conversion coefficients (PCC) determined at selected network sites during 1997 and 1998 .................. <br />23 <br />8. Power conversion coefficients (PCC) at network sites: (A) 1994 -97 State - approved PCC and 1998 <br />PCC, and (B) percent difference between 1994 -97 State - approved PCC and 1998 PCC .. ............................... <br />24 <br />9. Relation of ground -water pumpage from inline totalizing flowmeter to the differences in pumpage <br />estimates between power conversion coefficient approach and totalizing flowmeters, expressed <br />(A) in logarithmic units and (B) in acre -feet ....................................................................... ............................... <br />27 <br />10. Boxplots showing differences in ground -water pumpage estimates between power conversion coefficient <br />approach and totalizing flowmeters (A) for the entire network, (B) by portable flowmeter method, <br />(C) by make of totalizing flowmeter, and (D) by type of discharge distribution system, 1998 ... ............................... <br />28 <br />11. Graph showing relation of the mean and standard deviation of total network pumpage, in percent, <br />tothe number of strata ................................................................................................................. ............................... <br />37 <br />CONTENTS III <br />