Conversion Factors, Datums, and Abbreviations and Acronyms

Conversion Factors

Multiply	By	To obtain
Length
millimeter (mm)	0.03937	inch (in.)
meter (m)	3.281	foot (ft)
kilometer (km)	0.6214	mile (mi)
Area
square kilometer (km2)	0.3861	square mile (mi2)
Volume
cubic hectometer (hm3)	810.7	acre-foot (acre-ft)
Flow rate
cubic meter per second (m3/s)	70.07	acre-foot per day (acre-ft/d)
Mass
gram (g)	0.03527	ounce, avoirdupois (oz)
kilogram (kg)	2.205	pound avoirdupois (lb)
metric ton per day	1.102	ton per day (ton/d)

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

Datums

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

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

Abbreviations and Acronyms

ADCP	acoustic Doppler current profiler
CVO	Cascade Volcano Observatory
D16	Geometric mean particle-size diameter of the cumulative percent finer than 16th percentile
D50	Geometric mean particle-size diameter of the cumulative percent finer than 50th percentile
D84	Geometric mean particle-size diameter of the cumulative percent finer than 84th percentile
EWI	equal width increment
GPS	global positioning system
NWIS	National Water Information System
RKM	river kilometer
RTK	real-time kinematic
PSD	particle-size distribution
SEWI	single equal width increment
USFWS	U.S. Fish and Wildlife Service
USGS	U.S. Geological Survey