Conversion Factors, Datums, and Acronyms and Abbreviations

Conversion Factors

Multiply	By	To obtain
Length
inch (in.)	25.4	millimeter (mm)
foot (ft)	0.3048	meter (m)
mile (mi)	1.609	kilometer (km)
Area
acre	0.004047	square kilometer (km2)
square mile (mi2)	2.590	square kilometer (km2)
square yard (yd2)	0.8361	square meter (m2)
cubic foot (ft3)	0.02832	cubic meter (m3)
acre-foot (acre-ft)	1,233	cubic meter (m3)
Flow Rate
cubic foot per second (ft3/s)	0.02832	cubic meter per second (m3/s)
cubic foot per second per square mile [(ft3/s)/mi2]	0.01093	cubic meter per second per square kilometer [(m3/s)/km2]
Energy
kilowatthour (kWh)	3,600,000	joule (J)

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

°F=(1.8×°C)+32.

*Transmissivity: The standard unit for transmissivity is cubic foot per day per square foot times foot of aquifer thickness [(ft³/d)/ft²]ft. In this report, the mathematically reduced form, foot squared per day (ft²/d), is used for convenience.

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 distance above the vertical datum.

Acronyms and Abbreviations

BA	biological assessment
BLM	Bureau of Land Management
EWEB	Eugene Water and Electric Board
EFC	Environmental Flow Component
ESA	Endangered Species Act
FERC	Federal Energy Regulatory Commission
GLO	General Land Office
HEC	Hydrologic Engineering Center
IHA	Indicators of Hydrologic Alteration
LTER	Long-Term Ecological Research
NMFS	National Marine Fisheries Service
ODEQ	Oregon Department of Environmental Quality
SRP	Sustainable Rivers Project
TMDL	Total Maximum Daily Load
TNC	The Nature Conservancy
USACE	U.S. Army Corps of Engineers
USFS	U.S. Forest Service
USFWS	U.S. Fish and Wildlife Service
USGS	U.S. Geological Survey
WTC	water temperature control
WY	water year

First posted February 8, 2010