A symbol for one million?acre feet. This symbol, commonly used in reservoir management in the U.S., should be written Maf. 1 Maf = about 1.2335 billion (109) cubic meters
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}