Suggested citation and version history for Leake, S.A., Greer William, Watt, Dennis, and Weghorst, Paul, 2008, Use of superposition models to simulate possible depletion of Colorado River water by ground-water withdrawal: U.S. Geological Survey Scientific Investigations Report 2008-5189, 25 p. [http://pubs.usgs.gov/sir/2008/5189/]. Version 1.0, October 29, 2008 Initial release online at http://pubs.usgs.gov/sir/2008/5189/