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ПОСОБИЕ (гидротехнич строительство) 174.doc
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4. Finish the following sentences according to the text.

  1. In the design of almost every dam there must be .....

  2. ..... permit to control the release of water.

  3. Spillways must have the capacity to discharge major floods without...

  4. Overflow spillways are widely used on ....

  5. A steep-sloped open channel is called a chute, or ... and which is usually constructed of ...

  6. It may be constructed around .... when ...

  7. ... is one in which the flow after passing over the crest is carried away in a channel running ...

  8. In a shaft spillway the water drops through ...

  9. Small shaft spillways may be constructed of ...

  10. ... may be used if space is limited.

5. Answer the following questions.

  1. Is spillway the dangerous valve for a dam?

  2. What is an overflow spillway designed to?

  3. What structure is relatively light and is well adapted to earth and rock-fill dams?

  4. Why is the chute usually narrowed and then widened near the end?

  5. What drains may be used?

  6. Where is a side-channel spillway used?

  7. Where can a shaft spillway be used?

  8. What advantages have siphon spillways?

6. Copy out the table and fill in it.

Types of spillways

Characteristics

Usage

Additional information

1.overflow spillway

gravity, arch, buttress dams

2. …

expansion joints are required

3. …

run parallel to the crest

4. shaft spillway

5. …

It is used when space is limited.

7. Make a short summary of the text.

8. Choose the pairs of opposites.

necessary, to build, to permit, maximum, open, light, possible, to narrow, watertight, high, vertical, limited, impossible, to widen, permeable, low, horizontal, unlimited, heavy, close, to forbid, minimum, to damage, unnecessary, dangerous, safe

9. Choose the pairs of synonyms.

dam, velocity, sufficient, a trough, space, discharge, harm, room, a chute, to allow, structure, release, adequate, speed, embankment, construction, damage, to permit

10. Fill in the necessary preposition.

1) ___ the design ___ every dam; 2) to prevent sth ___ sth; 3) to be a safety valve ___ sth; 4) ___ the same time; 5) to flow ___ sth; 6) to be constructed __ sth; 7) to be preferred ___ sth; 8) to be required ___ sth; 9) to be available ___ sth; 10) to drop ___ sth.

11. Translate the following words into English using the vocabulary of the text.

Сливать воду, предотвращать от разрушения, различные цели, объем воды, дополнительные сооружения, в тоже время, заранее установленный уровень воды, крутой откос открытого канала, железобетонные плиты, топографические условия, предпочтительное местоположение, постоянная ширина, уменьшать скорость, параллельно гребню, вертикальный трубопровод, автоматически поддерживать уровень воды, проходить через гребень, построенный полностью из металла.