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How are river temperatures affected by dams?

A

Water in a reservoir behind a dam remains the same temperature as the water in the stream below the dam.

B

Water released from deep in a reservoir behind a dam is usually warmer in the summer and cooler in the winter than water in the stream below the dam.

C

Water released from deep in a reservoir behind a dam is usually cooler in the summer and warmer in the winter than water in the stream below the dam.

D

Year-round, water from outlets near the top of a reservoir tend to be cooler than the river water below.

E

Water temperatures in the reservoir behind the dam may vary in temperature from the river water below the dam but how they will be different is impossible to predict.

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