Why are the upper courses of rivers often chosen for hydroelectric power schemes?

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Question

Why are the upper courses of rivers often chosen for hydroelectric power schemes?

Accepted Answer

Steep gradients and narrow valleys suit dams and fast water — Award 1 mark. A narrow valley is cheaper to dam, and a large drop in height gives the water more energy to turn turbines.

Answer

Steep gradients and narrow valleys suit dams and fast water

Answer

Slow water in the upper course makes power generation easier

Answer

Deltas at the source give a large store of water behind dams

Answer

Wide floodplains provide a lot of space for the turbines

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