Conversion Factors and Datums


Conversion Factors


Multiply	By	To obtain
Length
centimeter (cm)	0.3937	inch (in.)
millimeter (mm)	0.03937	inch (in.)
meter (m)	3.281	foot (ft)
kilometer (km)	0.6214	mile (mi)
kilometer (km)	0.5400	mile, nautical (nmi)
meter (m)	1.094	yard (yd)
Area
square meter (m2)	0.0002471	acre
hectare (ha)	2.471	acre
square hectometer (hm2)	2.471	acre
square kilometer (km2)	247.1	acre
square meter (m2)	10.76	square foot (ft2)
square kilometer (km2)	0.3861	square mile (mi2)
Volume
cubic meter (m3)	264.2	gallon (gal)
cubic decimeter (dm3)	0.2642	gallon (gal)
cubic meter (m3)	0.0002642	million gallons (Mgal)
cubic centimeter (cm3)	0.06102	cubic inch (in3)
Flow Rate
cubic meter per second (m3/s)	70.07	acre-foot per day (acre-ft/d)




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 of 1988 (NAVD 88).


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


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


First posted February 16, 2012