Dam Construction and Hydrology
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Questions and Answers

What is the primary function of a dam?

  • To generate electricity
  • To develop fisheries
  • To prevent the flow of water and accumulate it in a reservoir (correct)
  • To provide navigational facilities

What happens to sediments when a river is stilled behind a dam?

  • They evaporate into the air
  • They are carried away by the current
  • They are transported to other rivers
  • They settle at the bottom of the reservoir (correct)

What is the term for the proportion of a river's total sediment load captured by a dam?

  • Trap efficiency (correct)
  • Reservoir capacity
  • Sediment capacity
  • Sediment balance

What is the consequence of dams interrupting the sediment transport through rivers systems?

<p>Sediment accumulation within the reservoir (C)</p> Signup and view all the answers

What type of sediment is virtually certain to be trapped by dams?

<p>Gravel (C)</p> Signup and view all the answers

What is the typical trap efficiency of dams for gravel?

<p>100% (B)</p> Signup and view all the answers

What can be transported as either bed load or suspended load, depending on turbulence of the flow?

<p>Sand (A)</p> Signup and view all the answers

What is the term for the process of sediment accumulation within a reservoir?

<p>Reservoir sedimentation (C)</p> Signup and view all the answers

Why do most river systems around the world show decreased sediment loads?

<p>Due to trapping by upstream dams (B)</p> Signup and view all the answers

What is the result of decreased sediment loads in rivers?

<p>Increased channel erosion (C)</p> Signup and view all the answers

What is the primary focus of studying hydrologic data in dam construction?

<p>To estimate the amount of water the dam will collect (B)</p> Signup and view all the answers

What is an environmental impact of sediment accumulation in dams?

<p>Reduced water quality (C)</p> Signup and view all the answers

What is a key consideration in site selection for dam construction?

<p>Geotechnical suitability of the foundation (A)</p> Signup and view all the answers

What is measured at gauge stations in dam construction?

<p>Surface runoff and flood flows (A)</p> Signup and view all the answers

What is studied in the context of dam construction to understand the structural stability of the foundation?

<p>Stratigraphy and rock formations (D)</p> Signup and view all the answers

What is a key aspect of the political and economic considerations in dam construction?

<p>Cost-benefit analysis of dam construction (A)</p> Signup and view all the answers

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