A Graphical Modeling Tool for Evaluating Nitrogen Loading to and Nitrate Transport in Ground Water in the Mid-Snake Region, South-Central Idaho

Scientific Investigations Report 2006–5137

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5137

Conversion Factors, Datums, Abbreviated Water-Quality Units, Acronyms, and Symbols

Conversion Factors

Multiply	By	To obtain
foot (ft)	0.3048	meter
foot squared per day (ft²/d)	0.09290	meter squared per day
gallon per minute (gal/min)	0.06309	liter per second
inch (in.)	2.54	centimeter
mile (mi)	1.609	kilometer
pounds per acre per year [(lb/acre)/yr]	1.121	kilograms per hectare per year
square mile (mi²)	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).

Transmissivity: The standard unit for transmissivity is cubic foot per day per square foot times aquifer thickness in feet [(ft³/d)/ft²]ft. In this report, the mathematically reduced form, foot squared per day (ft²/d), is used for convenience.

Abbreviated Water-Quality Units, Acronyms, and Symbols

Acronym/Water-Quality Unit/Symbol	Definition
GIS	Geographic Information Systems
GUI	graphical user interface
ESRP	eastern Snake River Plain
IDEQ	Idaho Department of Environmental Quality
mg/L	milligram per liter
NAWQA	National Water-Quality Assessment
NWIS	National Water Information System
RASA	Regional Aquifer-System Analysis
SRNSS	Snake River Nitrate Scenario Simulator
USGS	U.S. Geological Survey
≤	less than or equal to

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