Multiply By To obtain foot (ft) 0.3048 meter square mile (mi 2) 2.590 square kilometer acre-foot (acre-ft) 0.001233 cubic hectometer cubic foot per second (ft 3 /s) 0.02832 cubic meter per second gallon per minute (gal/min) 0.06308 liter per second gallon per day (gal/day) 0.003785 cubic meter per day Contents v ABBREVIATED WATER-QUALITY UNITS Chemical concentration and water temperature are given only in metric units. Chemical concentration in water is given in milligrams per liter (mg/L) or micrograms per liter (µg/L). Milligrams per liter is a unit expressing the solute mass (milligrams) per unit of volume (liter) of water. One thousand micrograms per liter is equivalent to 1 milligram per liter. For concentrations less than 7,000 milligrams per liter, the numerical value is about the same as for concentrations in parts per million. Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25°C). Chemical concentrations in streambed sediment are given in micrograms per gram (µg/g) or micrograms per kilogram (µg/kg). Micrograms per gram is equal to parts per million (ppm). Micrograms per kilograms is equal to parts per billion (ppb). VERTICAL DATUM Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929)-a geodetic datum derived from a general adjustment of the first-order level nets of the United States and Canada, formerly called "Sea Level Datum of 1929".

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