IntermediateTopic 69 of 112Civil & Structural

Dams

Gravity, arch and embankment dams resist water pressure.

In depth

Gravity dams resist water by weight; arch dams transfer load to abutments; embankment dams use earth/rockfill with impervious core. Design checks sliding, overturning, uplift, seepage, spillway capacity and seismic loads. Instrumentation monitors safety.

Key points

  • Hydrostatic and uplift forces
  • Probable maximum flood
  • Stilling basins
Example

Hoover Dam is a concrete arch-gravity dam 221 m high.

Why it matters

Dams hold large volumes of water and must resist very large forces, so their design is one of the most demanding in civil engineering.

Where this is used

  • Designing a concrete gravity dam to resist sliding and overturning.
  • Choosing an earth embankment dam where rock is weak.
  • Designing an arch dam in a narrow gorge with strong rock abutments.

Frequently asked questions

What is Dams?

Gravity, arch and embankment dams resist water pressure.

Why is it important to understand dams?

Dams hold large volumes of water and must resist very large forces, so their design is one of the most demanding in civil engineering.

What is the main difference between gravity and arch dams?

Gravity dams rely on their weight to resist water pressure, while arch dams transfer the load to the valley sides through arch action.

What is an embankment dam?

A dam built from earth or rockfill, which suits sites where soft ground or wide valleys make concrete impractical.

How is Dams used in practice?

Typical applications include designing a concrete gravity dam to resist sliding and overturning, choosing an earth embankment dam where rock is weak and designing an arch dam in a narrow gorge with strong rock abutments.

What should I learn before Dams?

Study "Bearings and expansion joints" first (topic 68 of 112 in Civil & Structural). It covers the groundwork this topic builds on.

What are the key points of Dams?

Hydrostatic and uplift forces. Probable maximum flood. Stilling basins.

Can you give an example of Dams?

Hoover Dam is a concrete arch-gravity dam 221 m high.

What comes after Dams?

The next topic is "Structural health monitoring", which builds directly on this one.

How difficult is Dams?

It is classed as Intermediate in Civil & Structural (topic 69 of 112). It is an intermediate topic. Work through the beginner topics in Civil & Structural first.

Learning path

Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.

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