Conversion Factors, Datums, and Abbreviations and Acronyms

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)
Area
square meter (m2)	10.76	square foot (ft2)
square kilometer (km2)	0.3861	square mile (mi2)
Volume
cubic meter (m3)	0.0008107	acre-foot (acre-ft)
cubic meter (m3)	35.31	cubic foot (ft3)
cubic meter (m3)	1.308	cubic yard (yd3)
liter (L)	0.03531	cubic foot (ft3)
Flow rate
cubic meter per second (m3/s)	35.31	cubic foot per second (ft3/s)
cubic meter per year (m3/yr)	1.308	cubic yard per year (yd3/yr)
meter per second (m/s)	3.281	foot per second (ft/s)
meter per year (m/yr)	3.281	foot per year (ft/yr)
millimeter per year (mm/yr)	0.0397	inch per year (in/yr)
kilogram per second (kg/s)	2.205	pound per second (lb/s)
kilogram per meter per second [(kg/m)/s]	4.486	pound avoirdupois per foot per second [(lb/ft)/s]
Mass
kilogram (kg)	2.205	pound avoirdupois (lb)

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).

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

Abbreviations and Acronyms

BAGS	Bedload Assessment in Gravel-bedded Streams
BLM	Bureau of Land Management
FPkm	flood-plain kilometer
GIS	geographic information system
GPS	global positioning system
HEC-RAS	Hydrologic Engineering Center’s River Analysis System
ka	kiloannum, a unit of time equal to one thousand years
LIDAR	Light Detection and Ranging
MLLW	mean lower low water
NAIP	National Agriculture Imagery Program
Rkm	river kilometer
RMSE	root mean square error
RTK	real-time kinematic
USFS	U.S. Forest Service
USGS	U.S. Geological Survey
UTM	Universal Transverse Mercator

Revised July 2012

First posted May 26, 2010