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<br />FIGURES <br /> <br />_I. Map showing location of study area........................................................................................................................... 3 <br />2. Hydrographs showing daily mean streamflow for selected sites on the Arkansas River, April 199O-March 1993 .. 6 <br />3. Boxplots showmg vanaUons in pH 10 the Arkansas RIver, Apnl199O-March 1993............. .......... ....................... 9 <br />4. Boxplots showmg variations in dissolved-solids concentrations in the Arkansas RIver, April 199O-March 1993.. II <br />5-24. Graphs showing: <br />5. Comparison of median concentrations of six major ions in the Arkansas River, April 1990-March 1993...... 13 <br />6. Median dissolved- and total-recoverable cadmium concentrations by streamflow regime in the upper <br />Arkansas River, April 199O-March 1993 .......................................................................................................... 17 <br />7. Median dissolved- and total-recoverable copper concentrations by streamflow regime in the upper <br />Arkansas River, April I 990-March 1993 .......................................................................................................... 20 <br />8. Median percentages of dissolved copper in percentage of total-recoverable copper concentrations <br />in the upper Arkansas River, April 1 990-March 1993...................................................................................... 21 <br />9. Median dissolved- and total-recoverable iron concentrations by streamflow regime in the upper <br />Arkansas River, April I 99O-March 1993 .......................................................................................................... 23 <br />10. Median percentages of dissolved-iron in percentage of total-recoverable iron concentrations in the upper <br />Arkansas River, April I 99O-March 1993 .......................................................................................................... 24 <br />II. Median dissolved- and total-recoverable lead concentrations by streamflow regime in the upper <br />Arkansas River, April 199O-March 1993 .......................................................................................................... 27 <br />12. Median percentages of dissolved lead in percentage of total-recoverable lead concentrations in the upper <br />Arkansas River, April 199O-March 1993 .......................................................................................................... 28 <br />13. Median dissolved- and total-recoverable manganese concentrations by streamflow regime in the upper <br />Arkansas River, April I 99O-March 1993 .......................................................................................................... 30 <br />14. Median percentages of dissolved manganese in percentage of total-recoverable manganese concentrations <br />in the upper Arkansas River, April I 99O-March 1993...................................................................................... 31 <br />15. Median dissolved- and total-recoverable zinc concentrations by streamflow regime in the upper <br />Arkansas River, April 199O-March 1993 .......................................................................................................... 34 <br />16. Median percentages of dissolved zinc in percentage of total-recoverable zinc concentrations in the upper <br />Arkansas River, April I 99O-March 1993 .......................................................................................................... 35 <br />17. Median lotal-recoverable chromium concentrations by streamflow regime in the lower <br />Arkansas River, April 1990-March 1993 .......................................................................................................... 39 <br />18. Median dissolved- and total-recoverable copper concentrations by streamflow regime in the <br />lower Arkansas River, April I 990-March 1993................................................................................................ 41 <br />19. Median dissolved- and total-recoverable iron concentrations by streamflow regime in the <br />lower Arkansas River, April 1 990-March 1993 ................................................................................................ 42 <br />20. Median total-recoverable lead concentrations by streamflow regime in the lower <br />Arkansas River, April I 990-March 1993 .......................................................................................................... 44 <br />21. Median dissolved- and total-recoverable manganese concentrations by streamflow regime in the <br />lower Arkansas River, April I 990-March 1993 ................................................................................................ 45 <br />22. Median dissolved- and total-recoverable nickel concentrations by streamflow regime in the lower <br />Arkansas River, April1990-March 1993 .......................................................................................................... 47 <br />23. Median dissolved- and total-recoverable selenium concentrations by streamflow regime in the lower <br />Arkansas River, April I 99O-March 1993 .......................................................................................................... 48 <br />24. Median dissolved- and total-recoverable zinc concentrations by streamflow regime in the lower <br />Arkansas River, April I 99O-March 1993 .......................................................................................................... 50 <br />25. Boxplols showing variations in total-ammonia concentrations in the Arkansas River, April I 99O-March 1993..... 52 <br />26. Graphs showing median total-ammonia and total-nitrite plus nitrate concentrations by streamflow regime in the <br />Arkansas River, April 1990-March 1993 .................................................................................................................... 54 <br />27-30. Boxplots showing: <br />27. Variations in total-nitrite plus nitrate concentrations in the Arkansas River, April I 99O-March 1993 ............ 55 <br />28. Variations in total-phosphorus concentrations in the Arkansas River, April I 990-March 1993 ...................... 57 <br />29. Variations in dissolved-uranium concentrations in the Arkansas River, April I 99O-March 1993.................... 58 <br />30. Variations in total-suspended-sediment concentrations in the Arkansas River, April I 990-March 1993 ........ 63 <br /> <br />IV CONTENTS <br />