The University of Arizona
Arizona Water Resources Research Center
Arizona Water Resources Research Center
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UNITS, ABBREVIATIONS AND CONVERSION FACTORS

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LENGTH
miles (mi) feet (ft) 5,280
miles (mi) kilometers (km) 1.609
feet (ft) meters (m) 0.3048
inches (in) millimeters (mm) 25.4

AREA
miles² (mi²) acres (ac) 640
hectares (ha) meters² (m²) 10,000
acres (ac) feet² (ft²) 43,560
acres (ac) hectares (ha) 2.471

VOLUME
acre-feet (a-f) gallons (gal) 325,851
acre-feet (a-f) feet³ (ft³) 43,560
meters³ (m³) liters (l) 1,000
meters³ (m³) feet³ (ft³) 35.310
feet³ (ft³) liters (l) 28.320
feet³ (ft³) gallons (gal) 7.481
liters (l) quarts (qt) 1.057

FLOW
feet³/second (cfs) liters/minute (lpm) 1,699
feet³/second (cfs) gallons/minute (gpm) 448.831
feet³/second (cfs) million gallons/day (mgpd) 0.6464

MASS
English tons pounds (lb) 2,000
metric tons kilograms (kg) 1,000
pounds (lb) ounces (oz) 16
kilograms (kg) pounds (lb) 2.207
ounces (oz) grams (g) 28.349
liters H20 (l) kilograms (kg) 1
feet³ H20 (ft³) pounds (lb) 62.4

PRESSURE
millibars (mb) Pascals (Pa) 10
millibars (mb) pounds/square inch (psi) 14.5
atmospheres (atm) millibars (mb) 0.001
atmospheres (atm) centimeters Hg (cm) 11,033.27
atmospheres (atm) feet H20 (ft) 33.99

CONCENTRATION
parts/million (ppm) milligrams/liter (mg/l) 1
parts/million (ppm) tons/acre-foot 0.00136


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Arizona Water Resources Research Center UA College of Agriculture and Life Sciences