What is reliable surface runoff? What percentage of the world’s reliable runoff are we using and what percentage are we likely to be using by 2025? How is most of the world’s water used? Define water...

What is reliable surface runoff? What percentage of the world’s reliable runoff are we using and what percentage are we likely to be using by 2025? How is most of the world’s water used? Define water footprint and virtual water and give two examples of each. Describe the availability and use of freshwater resources in the United States and the water shortages that could occur during this century. What are three major problems resulting from the way people are using water from the Colorado River basin?