Drainage basins and rivers

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Presentation transcript:

Drainage basins and rivers Chapter 17 Drainage basins and rivers

The hydrological cycle

Drainage basin

Velocity

Discharge

Gradient of a river

Vegetation

Permeability of rocks

Load

Wetted perimeter

Transportation

solution

River erosion

River erosion

Waterfalls

Meander

Case studies

Case study

Saturday, May 20, 2006 2:57 AM The Associated Press BEIJING (AP) Construction crews finished the dam of the world's largest hydroelectric project on Saturday, state media reported.The construction of the 607-foot high, 1.4-mile long dam across the Yangtze River does not fully complete the hugely controversial Three Gorges Dam project.The last 12 of the dam's 26 generators are to be installed over the next two years, said the China Yangtze River Three Gorges Project Development Corp. The project is set to be completed in 2008, a year ahead of schedule.Begun in 1993, the project has steamed ahead with the backing of the communist leadership despite objections to its $22 billion cost and environmental and social impact. More than 1.3 million people have been relocated to make way for the dam and its reservoir. Environmentalists and engineers have warned that the reservoir risks becoming polluted with waste from cities and towns upriver, many of which lack adequate sewage treatment plants.