Colorado River Basin statistics on water usage reveal that per capita water usage has actually declined by an average of at least one percent per year from 1990 to 2008. However, overall withdrawals from the basin have increased. The facts suggest that the increase in water usage cannot be blamed on overconsumption, but rather overpopulation. It is more than likely that the 10 million increase in the number of people who use water from the Colorado River Basin is the cause of this depleting resource. Read more from the Pacific Institute.