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Scientific Investigations Report 2007–5205

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5205

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Conversion Factors, Datums, and Abbreviations and Acronyms

Conversion Factors

Multiply By To obtain
inch (in.) 2.54 centimeter (cm)
inch (in.) 25.4 millimeter (mm)
foot (ft) 0.3048 meter (m)
mile (mi) 1.609 kilometer (km)
acre 4,047 square meter (m2)
acre 0.4047 hectare (ha)
acre 0.4047 square hectometer (hm2)
acre 0.004047 square kilometer (km2)
square foot (ft2) 929.0 square centimeter (cm2)
square foot (ft2) 0.09290 square meter (m2)
square mile (mi2) 259.0 hectare (ha)
square mile (mi2) 2.590 square kilometer (km2)
cubic foot (ft3) 28.32 cubic decimeter (dm3)
cubic foot (ft3) 0.02832 cubic meter (m3)
acre-foot (acre-ft) 1,233 cubic meter (m3)
acre-foot (acre-ft) 0.001233 cubic hectometer (hm3)
acre-foot per day (acre-ft/d) 0.01427 cubic meter per second (m3/s)
acre-foot per year (acre-ft/yr) 1,233 cubic meter per year (m3/yr)
acre-foot per year (acre-ft/yr) 0.001233 cubic hectometer per year (hm3/yr)
cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)
cubic foot per second per square mile [(ft3/s)/mi2] 0.01093 cubic meter per second per square kilometer [(m3/s)/km2]
cubic foot per day (ft3/d) 0.02832 cubic meter per day (m3/d)
foot per mile (ft/mi) 0.1894 meter per kilometer (m/km)

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

°F=(1.8×°C)+32.

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

°C=(°F-32)/1.8.

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.

Abbreviations and Acronyms

ET Evapotranspiration
GIS Geographic Information System
HRU Hydrologic Response Unit
MMS Modular Modeling System
m.y. Million years
PDSI Palmer Drought Severity Index
PRMS Precipitation-Runoff Modeling System
RMSE Root mean square error
USGS U.S. Geological Survey

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