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CONVERSION FACTORS AND ABBREVIATIONS Multiply By To obtain Length inch (in) 25.4 millimeter 2.54 centimeter foot (ft) 0.3048 meter mile (mi) 1.609 kilometer Area square foot (W) 0.0929 square meter square mile (mi) 2.590 square kilometer Volume gallon (gal) 3.785 liter 3785 milliliter Flow gallon per minute (gal/min) 0.06308 liter per second million gallons per day (Mgal/d) 0.04381 cubic meter per second Hydraulic Conductivity foot per day (ft/d) 0.3048 meter per day Transmissivity square foot per day (ftz/d) 0.09290 square meter per day 3.53 x 10-4 centimeter per second Physical and Chemical Water-Quality Units Terature: Water and air temperature are given in degrees Celsius (°C), which can be converted to degrees Fahrenheit (°F) by use of the following equation: OF = 1.8(°C) + 32 Specific electrical conductance of water is expressed in microsiemens per centimeter at 25 degrees Celsius (µS/cm). This unit is equivalent to micromhos per centimeter at 25 degrees Celsius. milligrams ter liter (mg/L) or micrograms Wr liter (per: Milligrams per liter is a unit expressing the concentration of chemical constituents in solution as weight (milligrams) of solute per unit volume (liter) of water. One thousand micrograms per liter is equivalent to one milligram per liter. For concen- trations less than 7,000 mg/L, the numerical value is the same as for concentrations in parts per million. nenhelometric turbidity unit (HM: A measure of turbidity in a water sample, roughly equivalent to Formazin turbidity unit (FTU) and Jackson turbidity unit (JTU). Other Sea level: In this report "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929)--a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called "Mean Sea Level of 1929." Vi