Conversion Factors, Datums, and Abbreviations and Acronyms

Conversion Factors

Multiply	By	To obtain
Length
foot (ft)	0.3048	meter (m)
mile (mi)	1.609	kilometer (km)
Area
square foot (ft2)	0.09290	square meter (m2)
square mile (mi2)	2.590	square kilometer (km2)
Volume
gallon (gal)	3.785	liter (L)
cubic foot (ft3)	0.02832	cubic meter (m3)
Flow Rate
cubic foot per second (ft3/s)	0.02832	cubic meter per second (m3s)
Mass
ton, short (2,000 lb)	0.9072	megagram (Mg)
ton per day per square mile [(ton/d)/mi2]	0.3503	megagram per day per square kilometer [(Mg/d)/km2]

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

°F=(1.8×°C)+32.

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25°C).

Suspended-sediment concentrations are reported in milligrams per liter (mg/L). Sediment loads are reported in tons.

Water year is the 12-month period from October 1 through September 30 of the following calendar year. The water year is designated by the calendar year in which it ends. For example, water year 2008 is the period from October 1, 2007, through September 30, 2008.

Datums

Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).

Horizontal coordinate information is referenced to North American Datum of 1927 (NAD 27).

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

Abbreviations and Acronyms

Abbreviation/ acronym	Definition
EWI	equal-width-increment
FNU	Formazin Nephelometric Unit
MSPE	model standard percent error
N	number of samples
NWIS	USGS National Water Information System
Q	streamflow
R2	coefficient of determination
RM	river mile
RMSE	root mean squared error
SSC	suspended-sediment concentration
SSQ	suspended-sediment discharge
SSL	suspended-sediment load
T	turbidity
USGS	U. S. Geological Survey