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<br /> <br />23, Temporal distribution of measured and simulated pH at Yampa River near Maybell, 1950-99,...................., 31 <br />24, Temporal distribution of concentrations of nitrate at Yampa River near Maybell, 1950-94........,.................., 33 <br />25, Temporal distribution of difference between onsite and measured laboratory pH at Yampa River near <br />Maybell, 1980-99 """",..""""""",.."""",..""""" ,......"""""""""",.."""",.. ,..""",'..".."",.."..""""".."""",.. 34 <br /> <br />TABLES <br /> <br />L River miles of sites sampled for this study ..............................,........................,....................,..........,..............,...... 7 <br />2, Summary of Wilcoxon-Mann-Whitney rank-sum tests comparing flow-adjusted physical measurements, <br />constituent concentrations, and thermodynamic properties of water samples collected from Yampa River near <br />Maybell during 1950-74 with those measurements, concentrations, and properties collected during 1975-99.... 26 <br />3. Ousite measurements and concentrations of major and minor water-quality constituents in samples collected <br />from Yampa River and tributary sites, August 1999 and March 2000........,.........................................................., 40 <br /> <br />CONVERSION FACTORS, VERTICAL DATUM, AND ABBREVIATIONS <br /> <br />Multiply By To obtain <br /> Length <br />inch 2,54 centimeter <br />foot (ft) 0.3048 meter <br />mile 1.609 kilometer <br /> Area <br />square mile 2.590 square kilometer <br /> Volume <br />acre-foot (acre~ft) 1,233 cubic meter <br /> Flow <br />cubic foot per second (ft3/s) 0,02832 cubic meter per second <br /> Mass <br />ton per day (ton/d) 0,9072 metric ton per day <br /> Pressure <br />atmosphere, standard (atm) IOU kilopascal <br /> <br />Temperature in degrees Celsius (0 C) may be converted to degrees Fahrenheit (0 F) as follows: <br /> <br />"F=L8 ("C) +32 <br /> <br />Sea level: In this report "sea level" refers to the National Geodetic Vertical Datum of 1929-a geodetic datum derived <br />from a general adjustment of the first-order level nets of the United States and Canada, formerly called Sea Level <br />Datum of 1929, <br /> <br />Altitude, as used in this report, refers to distance above or below sea level. <br /> <br />ADDITIONAL ABBREVIATIONS <br /> <br />~g/L <br />JlIIlol/L <br />flSlcm <br />mglL <br /> <br />micrograms per liter <br />rnicromoles per liter <br />microsiemens per centimeter at 25 degrees Celsius <br />milligrams per liter <br /> <br />iv CONTENTS <br />