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<br />~~~1'.!.'1 <br />~./ '- '.Jo .. ~.-~ ."_ <br /> <br />CONTENTS <br /> <br />Abslract.................................................................................................................................................................................1 <br />Introduction ........................................................................................................................................................................... 2 <br />Purpose and scope ...........................................................................,........................................................................... 3 <br />Background hydrology and description of slody area ................................................................................................ 3 <br />Me!hods of data collection ..................................................................................,................................................................. 5 <br />Discharge measurements........................................................... ..................................................................................5 <br />Continuous river-stage and ground-waler.level measurements .................................................................................. 7 <br /> <br />Waler-quality sampling ....................................................,.......................................................................................... 8 <br />Sediment sampling.................................................................. ....................................................................................10 <br />QuantiEy of ground-waler discharge...................................................................................................................................... 11 <br />Large-area 110w syslem ............................................................................................................................................... 11 <br />Small-area 110w syslem ............................................................................................................................................... 12 <br />Quality of ground-water discharge........................................................................................................................................ 17 <br />Large-area 110w syslem ............................................................................................................................................... 17 <br />Small-area 110w syslem ............................................................................................................................................... 23 <br />Summary...............................................................................................................................................................................35 <br />References cited .................................................................................................................................................................... 37 <br />Hydrologic and water-quality data........................................................................................................................................ 39 <br /> <br />PLATE <br /> <br />[In pocket] <br /> <br />1. Map showing location of sampling siles in study area <br /> <br />FIGURES <br /> <br />1-18, Graphs showing: <br />1. Mean mon!hly discharge at two streaml1ow-gaging stations on !he Sou!h Platte River between <br />Denver and Fort Lupton.............................................................................................................................. 4 <br />2. (A) Daily l1uctoations in discharge from !he Metro Wastewaler ReclamaEion District eftluent <br />outfalls, and (B) daily changes in river stage at Henderson and Road 8.................................................... 13 <br />3. Difference in altitode between surface waler and water in !he lA wells at Henderson and <br /> <br />Road 8 ........................................................,................................................................................................ 14 <br />4. RaEe of instantaneous ground-water discharge across !he sediment/waler inlerface wi!h (A) time, <br />and (B) distance downstream from !he Metro Waslewaler Reclamation District eftluenE outfalls ............ 15 <br />5. Rale of instantaneous ground-waler discharge across !he sediment/waler interface wi!h time <br />in !he Sou!h Platte River at (A) McKay Road on January 24 and 25, 1993; (B) Henderson on <br />January 26 and 27, 1993; and (C) Road 8 on November 18 and 19, 1992................................................. 16 <br />6. Values of pH in waler from wells at McKay Road, Henderson, and Road 8 ............................................. 18 <br />7. Average difference in pH between ground water and surface waler, by well, at McKay Road, <br />Henderson, and Road 8.....................................,......................................................................................... 19 <br />8. Concentrations of dissolved oxygen in water from wells at McKay Road, Henderson, and <br />Road 8 ......................................................................................................................................................... 20 <br />9. Concentrations of dissolved nitrite plus nilrale in water from wells at McKay Road, Henderson, <br />and Road 8 .................................................................................................................................................. 23 <br />10. Concentrations of dissolved ammonium in waler from wells aE McKay Road, Henderson, and <br /> <br />Road 8 ......................................................................................................................................................... 24 <br /> <br />CONTENTS III <br />