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CONVERSION FACTORS, VERTICAL DATUM, AND ABBREVIATIONS <br />Multiply By To obtain <br /> Length <br />mile (mi) 1.609 kilometer (km) <br /> Volume <br />cubic foot (ft3) 0.02832 cubic meter <br /> Flow <br />cubic foot per second (ft3/s) 0.02832 cubic meter per second <br /> Mass <br />pound avoirdupois (lb avdp) 0.4536 kilogram <br />pound per day (lb/d) 0.4536 kilogram per day <br />pound per year (lb/yr) 0.4536 kilogram per year <br />ton, short 0.9072 metric ton <br />ton per day (ton/d) 0.9072 metric ton per day <br />ton per year (ton/yr) 0.9072 metric ton per year <br />Temperature in degrees Celsius (° C) may be converted to degrees Fahrenheit (° F) as follows: <br />° F=1.8° C+32 <br />Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25°C). <br />Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) or micrograms per <br />liter (µg/L). Concentrations in milligrams per liter are commonly expressed as parts per million (ppm), and concentra- <br />tions in micrograms per liter are commonly expressed as parts per billion (ppb). <br />ACRONYMS <br />BOR Bureau of Reclamation <br />NIWQP National Irrigation Water Quality Program <br />USGS U.S. Geological Survey <br />iv CONTENTS