Choose the best variant

1) The finest material in earth-fill dam is placed…

a) in the center b) outside the core c) on the upstream face

2) Embankment dams are known as…

a) rock-fill b) fill dam c) riprap

3) Rip rap serves as an outer protection against…

a) water action, wind, rain, ice b) fill cracks c) leakage

4) An earth-fill dam is an embankment dam in which compacted earth materials make up…

a) the whole dam b) 1/3 the dam c) more than ½ the dam

Answer the following questions.

a) When is it most economical to build a rock-fill dam?

b) What are the rock-fill dams constructed of?

c) What covering do they have on the upstream face?

d) What makes the rock-fill dam watertight?

Finish the following sentences according to the text.

1) Timber dams are built where…

2) The timber is weighted down with…

3) Planking or other impervious material forms ….

4) Dams with movable gates are built where …

5) A roller can be raised and lowered to allow …

What parts of the text can you define? Do they correspond to the paragraphs? Give the titles to each part.

1._________________ 3._________________

2._________________ … _________________