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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?

Sediment accumulation within the reservoir Signup and view all the answers

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

Gravel Signup and view all the answers

What is the typical trap efficiency of dams for gravel?

100% Signup and view all the answers

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

Sand Signup and view all the answers

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

Reservoir sedimentation Signup and view all the answers

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

Due to trapping by upstream dams Signup and view all the answers

What is the result of decreased sediment loads in rivers?

Increased channel erosion Signup and view all the answers

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

To estimate the amount of water the dam will collect Signup and view all the answers

What is an environmental impact of sediment accumulation in dams?

Reduced water quality Signup and view all the answers

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

Geotechnical suitability of the foundation Signup and view all the answers

What is measured at gauge stations in dam construction?

Surface runoff and flood flows Signup and view all the answers

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

Stratigraphy and rock formations Signup and view all the answers

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

Cost-benefit analysis of dam construction Signup and view all the answers