Conversion Factors, Datums, and Acronyms and Abbreviations

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 kilometer (km2)	247.1	acre
square kilometer (km2)	0.3861	square mile (mi2)
Volume
cubic meter (m3)	1.308	cubic yard (yd3)
liter (L)	0.2642	gallon (gal)
milliliter (mL)	0.03382	ounce, fluid (fl. oz)
Flow rate
cubic meter per second (m3/s)	35.31	cubic foot per second (ft3/s)
Mass
gram (g)	0.03527	ounce, avoirdupois (oz)
megagram (Mg)	1.102	ton, short (2,000 lb)
megagram per day (Mg/d)	1.102	ton per day (ton/d)
megagram per year (Mg/yr)	1.102	ton per year (ton/year)
megagram per square kilometer (Mg/km2)	2.8547	ton per square mile (ton/mi2)
milligram (mg)	3.527 × 10-5	ounce, avoirdupois (oz)

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

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).

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

Acronyms and Abbreviations

EDI	equal discharge increment
GCLAS	Graphical Constituent Loading Analysis Software
OLS	ordinary least-squares
NWIS	National Water Information System
RK	river kilometer
USGS	U.S. Geological Survey