Multiple choice general knowledge science & technology

For generation of hydroelectric power, why are dams not permanent solutions, and are instead short-lived structures?

  1. water volume usually decreases over time due to significant cracks in the dam

  2. dams are usually not well built, so they will collapse, usually within a few years of construction

  3. debris and rocks are deposited on the downstream side of the dam, thus making the power of the impounded water lowered

  4. sediment is deposited on the upstream side of the dam, thus making the impounded water a lower volume
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dams face a longevity issue primarily due to siltation. Rivers carry sediment which settles in the reservoir (upstream), gradually reducing the volume of water the dam can hold and eventually rendering the power generation ineffective. This is a natural geological process that limits a dam's lifespan.

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