Conversion Factors, Datums, and Abbreviations and Acronyms


Conversion Factors


Multiply	By	To obtain
foot (ft)	0.3048	meter (m)
mile (mi)	1.609	kilometer (km)
square mile (mi2)	2.590	square kilometer (km2)
cubic mile (mi3)	4.168	cubic kilometer (km3)




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


°F=(1.8×°C)+32.


Datums


Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD88).


Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD83).


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


Abbreviations and Acronyms


CPRAS	Columbia Plateau regional aquifer system
CRBG	Columbia River Basalt Group
DEM	digital elevation map
GIS	geographical information system
GWMA	Groundwater Management Area
NWIS	National Water Information System
RASA	Regional Aquifer-System Analysis program
USGS	U.S. Geological Survey

First posted February 25, 2011