Temperature can be converted to degrees Fahrenheit (°F) or degrees Celsius (°C) by using the following equations:°F = (°C x 1.8) + 32°C = (°F-32) / 1.8 Sea Level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD or 1929)-a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929. Abbreviated water-quality units: Chemical concentrations are given in metric units. Waterquality units are expressed in micrograms per liter (µg/L) or milligrams per liter (mg/L) in this report. Multiply By To obtain Area inch (in.) 2.54 centimeter foot (ft) 0.3048 meter mile (mi) 1.609 kilometer square mile (mi 2) 2.590 square kilometer Volume cubic foot (ft 3) 0.02832 cubic meter Flow Rate cubic foot per second (ft 3 /s) 0.02832 cubic meter per second Cover photograph: Groundwater level monitoring well BR-107 in Brunswick County, North Carolina (photograph by J.M. Fine, USGS).
Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29). Horizontal coordinate information (latitudes and longitudes) is referenced to the North American Datum of 1983 (NAD 83). Transmissivity: The standard unit for transmissivity is cubic foot per day per square foot times foot of aquifer thickness [(ft 3 /d)/ft 2 ]ft. In this report, the mathematically reduced form, foot squared per day (ft 2 /d), is used for convenience.
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