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How is water trapped from coastal waters?

(a) By building canals

(b) By building dams

(c) By digging wells

(d) By storing in tanks

This question was addressed to me during an online interview.

Asked question is from Tidal Energy topic in section Ocean Energy & Geothermal Energy of Energy Engineering

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Right choice is (b) By building dams

For explanation I would say: The tides are one of the sources of energy from the oceans. This energy can be tapped from coastal waters by building dams. Dams entrap the water at high tide and release it at low tide back to the sea.

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