Primary Geography - Water: Where Does It All Come From?

Exploring the effect of water on people's lives in different localities. Steve Backshall follows the journey of water around the water cycle, from a rainy hilltop in Derbyshire to the North Sea. The programme concludes in south west USA, where the Colorado River and Hoover Dam supply water to the cities of the Great American Desert - exactly the same principles but on a much grander scale.