Conversion Factors, Datums, Acronyms, and Abbreviations

Conversion Factors

SI to Inch/Pound

Multiply	By	To obtain
centimeter (cm)	0.3937	inch (in.)
meter (m)	3.2808333	U.S. Survey foot (ft)
kilometer (km)	0.6214	mile (mi)
cubic meter per second (m3/s)	35.31	cubic foot per second (ft3/s)
millisecond (ms)	0.001	second (s)

Inch/Pound to SI

Multiply	By	To obtain
foot (ft)	0.3048	meter (m)
foot per second (ft/s)	0.3048	meter per second (m/s)
cubic foot per second (ft3/s)	0.02832	cubic meter per second (m3/s)

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

°C= (°F-32)/1.8.

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

Horizontal coordinate information is referenced to Washington State Plane South coordinate system and datum NAD 83, unless noted otherwise.

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

Acronyms and Abbreviations

GPS	global positioning system
LIDAR	Light Detection and Ranging
ppm	parts per million
RMS	root mean square
RTK	Real-Time Kinematic
TSC	Trimble Survey Controller
USGS	U.S. Geological Survey
WAWSC	USGS Washington Water Science Center