U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2004–5237
Conceptual Model and Numerical Simulation of the Ground-Water-Flow System in the Unconsolidated Deposits of the Colville River Watershed, Stevens County, Washington
Conversion Factors and Datums
| Multiply | By | To obtain |
|---|---|---|
| Length | ||
| inch (in.) | 2.54 | centimeter |
| inch (in.) | 25.4 | millimeter |
| foot (ft) | .3048 | meter |
| mile (mi) | 1.609 | kilometer |
| Area | ||
| acre | 4,047 | square meter |
| acre | .4047 | hectare |
| acre | .004047 | square kilometer |
| square foot (ft2) | 929.0 | square centimeter |
| square foot (ft2) | .09290 | square meter |
| section (640 acres or 1 square mile) | 259.0 | square hectometer |
| square mile (mi2) | 259.0 | hectare |
| square mile (mi2) | 2.590 | square kilometer |
| Volume | ||
| gallon (gal) | 3.785 | liter |
| gallon (gal) | .003785 | cubic meter |
| million gallons (Mgal) | 3,785 | cubic meter |
| cubic foot (ft3) | .02832 | cubic meter |
| acre-foot (acre-ft) | 1,233 | cubic meter |
| acre-foot (acre-ft) | .001233 | cubic hectometer |
| Flow rate | ||
| acre-foot per year (acre-ft/yr) | 1,233 | cubic meter per year |
| acre-foot per year (acre-ft/yr) | .001233 | cubic hectometer per year |
| foot per day (ft/d) | .3048 | meter per day |
| cubic foot per second (ft3/s) | .02832 | cubic meter per second |
| gallon per day (gal/d) | .003785 | cubic meter per day |
| million gallons per day (Mgal/d) | .04381 | cubic meter per second |
| inch per year (in/yr) | 25.4 | millimeter per year |
| Hydraulic conductivity | ||
| foot per day (ft/d) | 0.3048 | meter per day |
| Hydraulic gradient | ||
| foot per mile (ft/mi) | 0.1894 | meter per kilometer |
| Transmissivity* | ||
| foot squared per day (ft2/d) | 0.09290 | meter squared per day |
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).
*Transmissivity: The standard unit for transmissivity is cubic foot per day per square foot times foot of aquifer thickness [(ft3/d/ft2]ft. In this report, the mathematically reduced form, foot squared per day (ft2/d), is used for convenience.
DATUMS
Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD29).
Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD83).
Altitude, as used in this report, refers to distance above or below sea level.
For more information about USGS activities in Washington, visit the USGS Washington District home page .
