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Scientific Investigations Report 2007–5164

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5164

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Conversion Factors, Datums, and Abbreviated Water-Quality Units

Conversion Factors

Multiply By To obtain
acre 4,047 square meter (m2)
acre 0.4047 hectare (ha)
acre-ft (acre-ft) 1,233 cubic meter (m3)
acre-ft (acre-ft) 0.001233 cubic hectometer (hm3)
cubic foot (ft3) 28.32 cubic decimeter (dm3)
cubic foot (ft3) 0.02832 cubic meter (m3)
cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)
foot (ft) 0.3048 meter (m)
inch (in.) 2.54 centimeter (cm)
inch (in.) 25.4 millimeter per year (mm/yr)
mile (mi) 1.609 kilometer (km)
ton, short (2,000 lb) 0.9072 megagram (Mg)
ton per day (ton/d) 0.9072 metric ton per day
ton per year (ton/yr) 0.9072 metric ton per year
ounce, avoirdupois (oz) 28.35 gram (g)
square foot (ft2) 929.0 square centimeter (cm2)
square foot (ft2) 0.09290 square meter (m2)
square mile (mi2) 259.0 hectare (ha)
square mile (mi2) 2.590 square kilometer (km2)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8×°C)+32.

Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows:

°C=(°F-32)/1.8.

Datums

Vertical coordinate information is referenced to the North American Vertical Datum 1988 (NAVD 88).

Horizontal coordinate information is referenced to the North American Datum 1983 (NAD 83).

Altitude, as used in this report, refers to distance above the vertical datum.

Water-Quality Units

Specific conductance is reported in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25°C).

Concentrations of chemical constituents in water are reported either in milligrams per liter (mg/L) or micrograms per liter (µg/L).

Concentrations of chemical constituents in water and sediment are reported either in micrograms per kilogram (µg/kg) or micrograms per liter (µg/L), which is equivalent to parts per billion.

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