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U.S. Geological Survey Scientific Investigations Series 2009-5268

Trends in Water Quality in the Southeastern United States, 1973–2005

Conversion Factors

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Inch/Pound to SI

Multiply

By

To obtain
Length

mile (mi)

1.609

kilometer (km)
Area

square mile (mi2)

259.0

hectare (ha)

square mile (mi2)

2.590

square kilometer (km2)

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

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

 

Acronyms used in the report:

 
AMLE   Adjusted maximum likelihood estimator
HR   Hydrologic Region (a major watershed)
LOWESS   Locally weighted scatterplot smoothing
LRL   Laboratory reporting level
MDL   Method detection level
MRL   Minimum reporting level
MVUE   Minimum variance unbiased estimator
NADP/NTN   National Atmospheric Deposition Program/National Trends Network
NASQAN   National Stream Quality Accounting Network
NAWQA   National Water Quality Assessment Program
NHD   National Hydrography Dataset
NTU   Nephelometric turbidity unit
NWIS   National Water Information System (database)
NWQL   National Water Quality Laboratory
NWQSS   National Water Quality Surveillance System
RC   Re-censored (pertains to data)
SPARROW   Spatially Referenced Regression on Watershed Attributes
STORET   Storage and Retrieval (database)
USEPA   U.S. Environmental Protection Agency
USGS   U.S. Geological Survey

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