Conversion Factors, Datums, and Abbreviations and Acronyms


Inch/Pound to SI


Multiply	By	To obtain
inch (in.)	2.54	centimeter (cm)
foot (ft)	0.3048	meter (m)
mile (mi)	1.609	kilometer (km)
Acre	4,047	square meter (m2)
square mile (mi2)	640	acre
square foot (ft2)	0.09290	square meter (m2)
acre-foot (acre-ft)	43,560	cubic foot (ft3)
acre-foot per yr (acre-ft/yr)	119.3	cubic foot per day (ft3/d)
foot per day (ft/d)	0.3048	meter per day (m/d)
foot per year (ft/yr)	0.3048	meter per year (m/yr)
gallons per minute (gal/min)	192.5	cubic foot per day (ft3/d)
cubic foot per second (ft3/s)	86,400	cubic foot per day (ft3/d)
foot squared per day (ft2/d)	0.09290	meter squared per day (m2/d)

SI to Inch/Pound


Multiply	By	To obtain
centimeter (cm)	0.3937	inch (in.)
meter (m)	3.281	foot (ft)
millimeter (mm)	0.03937	inch (in.)

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 (NAVD88).


Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD27), utilizing the NAD_1927_StatePlane_Oregon_North_FIPS_3601 projection.


Elevation, as used in this report, refers to distance above the vertical datum in a strict sense when associated with a value and in a broad sense when not associated with a value.


Abbreviations and Acronyms


AR	artificial recharge
ASR	aquifer storage and recovery
CLU	Common Land Unit
CRBG	Columbia River Basalt Group
HFB	Horizontal Flow Barrier
LPF	Layer Property Flow
MRC	master recession curve
OWRD	Oregon Water Resources Department
PART	Stream hydrograph separation computer program that uses the streamflow partitioning method
RM	river mile
RORA	Streamflow recession analysis computer program based on the Rorabaugh method
SWCD	Soil and Water Conservation District
USGS	U.S. Geological Survey
WRIS	Water Rights Information System

First posted March 1, 2012