Group items matching

in title, tags, annotations or url

Updated Oct 2011

Updated Oct 2011

Using the Everglades, USA Updated Nov 2011

Brilliant resource for freshwater and river management strategies.

"Hydraulic radius = cross sectional area / wetted perimeter. Hydraulic radius is a measure of the efficiency of the the river channel. The higher the hydraulic radius, the more efficient the river channel is. The more efficient the river is, the more energy the water will have to move downstream (so as hydraulic radius increases, velocity increases) carry load (so as hydraulic radius increases, the river's competence and capacity increases) increase the rate of erosion (in the upper course, as hydraulic radius increases, there is a higher rate of vertical erosion, so gradient increases; further downstream where the river is closer to base level, as hydraulic radius increases, there is a higher rate of lateral erosion)."

An excellent website that looks at the key issues surrounding building Dams upstream on the Mekong. Good for international and local conflicts

 How science is replacing pigs: Flood forecasting in the Philippines

"For many developing countries hungry for energy sources, hydropower is an attractive option. But dams also can place heavy burdens on surrounding populations and eco-systems. While China touts its Three Gorges dam - the world's largest - as environmentally friendly, the United States has begun tearing down a number of its own structures for safety, economic, and environmental reasons. To broaden your knowledge of dams around the world, explore below the economic, environmental, social, and political aspects of five big dam projects in Turkey, Brazil, Laos, Lesotho, and China. "

A short CNN documentary about pollution in the Ganges River.