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CONTENTS <br />Abstract.................................................................................................................................................. ............................... <br />1 <br />Introduction........................................................................................................................................... ............................... <br />2 <br />Purposeand scope ....................................................................................................................... ............................... <br />2 <br />Acknowledgments....................................................................................................................... ............................... <br />2 <br />Description of the South Platte River Basin .......................................................................................... ............................... <br />2 <br />Physicalsetting ........................................................................................................................... ............................... <br />3 <br />Hydrologicsetting ....................................................................................................................... ............................... <br />3 <br />Wateruse ..................................................................................................................................... ............................... <br />11 <br />Urban practices .. .. ........ .. .. <br />15 <br />Agriculturalpractices .................................................................................................................. ............................... <br />15 <br />Water - quality issues in the basin ................................................................................................. ............................... <br />16 <br />Sources and characteristics of available water-quality data <br />18 <br />Data- selection criteria and screening procedures ........................................................................ ............................... <br />18 <br />'i Quality assurance of data <br />Sitecharacterization ............................................................................................................................... ............................... <br />32 <br />Data- analysis methods ........................................................................................................................... ............................... <br />32 <br />Nutrients................................................................................................................................................. ............................... <br />34 <br />Description of surface -water data ................................................................................................ ............................... <br />34 <br />Descriptionof ground -water data ................................................................................................ ............................... <br />40 <br />Concentrations in surface water .................................................................................................. ............................... <br />47 <br />Trendsin surface water ............................................................................................................... ............................... <br />60 <br />Relation of concentration to streamflow ..................................................................................... ............................... <br />60 <br />Loadsin surface water ................................................................................................................ ............................... <br />67 <br />Concentrationsin ground water .................................................................................................. ............................... <br />71 <br />Suspendedsediment ............................................................................................................................... ............................... <br />78 <br />Descriptionof data ....................................................................................................................... ............................... <br />81 <br />Concentrations..........................................................................................................::................. ............................... <br />84 <br />Loads............................................................................................................................................ ............................... <br />88 <br />Pesticides............................................................................................................................................... ............................... <br />88 <br />Descriptionof surface -water data ................................................................................................ ............................... <br />88 <br />Descriptionof ground -water data ................................................................................................ ............................... <br />91 <br />Concentrations in surface water .................................................................................................. ............................... <br />97 <br />Concentrationsin ground water ................................................................................................... ............................... <br />101 <br />Summary............................................................................................................................................... ............................... <br />101 <br />SouthPlatte River Basin ............................................................................................................. ............................... <br />101 <br />Sources and characteristics of available water - quality data ........................................................ ............................... <br />106 <br />Nutrients...................................................................................................................................... ............................... <br />106 <br />Suspendedsediment ..................................................................................................................... ............................... <br />107 <br />Pesticides..................................................................................................................................... ............................... <br />107 <br />Referencescited .................................................................................................................................... ...:........................... <br />108 <br />Supplementaldata ................................................................................................................................. ............................... <br />i <br />111 <br />CONTENTS <br />III <br />