Scientific Investigations Report 2006-5035

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5035

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Conversion Factors, Datums, Definitions, and Abbreviations and Acronyms

Conversion Factors

Multiply By To obtain
cubic foot per second (ft3/s) 0.02832 cubic meter per second
foot (ft) 0.3048 meter
inch (in.) 2.54 centimeter
inch per year (in/yr) 25.4 millimeter per year
mile (mi) 1.609 kilometer
square mile 2.590 square kilometer

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.

Definitions

Water year: In U.S. Geological Survey reports, a water year is the 12-month period from October 1 through September 30. The water year is designated by the calendar year in which it ends; thus, the water year ending September 30, 2001, is called the “2001 water year”.

Climatic year: In U.S. Geological Survey reports, a climatic year is the 12-month period from April 1 through March 31. The climatic year is designated by the calendar year in which it begins; thus, the climatic year beginning April 1, 2001, is called the”2001 climatic year.”

Abbreviations and Acronyms

Abbreviations and Acronyms Meaning
GIS Geographic Information System
GLS Generalized Least Squares
IDEQ Idaho Department of Environmental Quality
MSE mean square error
NPDES National Pollution Discharge Elimination System
OLS Ordinary Least Squares
TMDL Total Maximum Daily Load
USGS U.S. Geological Survey

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For more information about USGS activities in Idaho, visit the USGS Idaho Water Science Center home page .


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