Less than one percent of the total fresh water on Earth is available for human use in streams and lakes (UN Water 2013). The amount of water available today is the same amount that was available 2,000 years ago but the world's population then was merely three percent of what it is today, making the demand and pressure on the freshwater supply increasingly strained (Lane et al. 2003). Available fresh water is also sometimes removed or lost by evaporation and human's dams and diversions.