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2.5. Read the text.

1. On the basis of word-building chains with the stem “sprinkle” and “pipe” try to define:

– what systems of sprinkler irrigation came into widespread use;

– whether there is any information concerning the classification of the sprinkler systems and their main constituent parts.

2. Translate the text into Ukrainian: text a.

1. In sprinkler irrigation the water falls on the land surface in a uniform pattern. This method came into widespread use because it could be adapted to most sites and crops.

2. The advantages of sprinkler irrigation are:

a) Erosion can be controlled. Safe irrigation is possible on land too steep for the efficient use of other methods.

b) Uniform application is possible on all kinds of soil. On sandy soils that have high intake rates, sprinkler irrigation distributes water better than other methods do.

c) Land preparation is not required. More land is available for cropping. Field ditches, corrugations and dikes are needed.

d) Shallow streams of irrigation water can be used efficiently.

3. The limitations are:

a) Rather high initial cost of installations.

b) Much water may be lost due to evaporation and wind.

c) A constant water supply is needed for the most economical use of equipment.

d) The water must be clean and free of sand and debris.

e) Light soils, which have slow intake rates, cannot be irrigated efficiently in hot, windy climates. But the techniques are changing and it is to be hoped that the things will not stay the same.

4. Three types of sprinkler systems are used to irrigate farm crops: rotating sprinkler heads, fixed jets, perforated pipes.

5. Rotating sprinkler head systems are the more widely used type. In Ukraine the “Fregate”, “Volzhanka” and “Dnieper” sprinklers are among the most efficient types of sprinkling machines which are in widespread use, and their number is constantly increasing.

6. Each rotating sprinkler head applies water to a given area. This area is governed by the nozzle size and the water pressure.

7. Sprinklers in the low-pressure range have small area of coverage. Medium-pressure sprinklers cover larger areas and have a wide range of precipitation rates.

8. High-pressure sprinklers cover large areas, and precipitation rates are higher than for the moderate or medium pressures.

9. The sprinkler system includes the pumping plant to provide needed pressure, the sprinkler, the riser pipe, the main pipeline, and the lateral distribution pipe.

10. Sprinkler systems are classified as:

a) permanent installations, with buried main and lateral lines;

b) semi-permanent installations, with fixed main lines and portable laterals;

c) fully portable systems.

11. Sprinklers with perforated pipes deliver water through very small holes.

III. Vocabulary study

3.1. Translate into Ukrainian the following words with common stem and word-combinations:

– to cover, covered, coverage, covering, to discover, discovery, coverture, discoverable.

– efficiency, efficient, efficiently, inefficient, inefficiency, efficacious, efficacity, efficacy, efficience.

– to fix, fixable, fixation, fixed, fixative, fixature, fixedly, fixedness, fixing, fixity, fixture, to unfix, unfixed;

– limit (n), limit (v), limitable, limitary, limitation, limited, limitative, limiting, limitless, unlimited, limiter;

– press (n), press (v), pressure, pressing, pressed, presser, pressurize, impress, impression, impressive, impressment.

3.2. Match the words from the left-hand column to the corresponding translation from the right-hand column:

головний трубопровід

permanent installation

тиск води

constant water supply

регулювати

range

висока вартість обладнання

land surface

ефективне використання

limitation

земна поверхня

nozzle size

стаціонарна установка

portable laterals

діапазон

water pressure

розмір насадки

main pipeline

безперервне водопостачання

high cost of installation

обмеження

to control

пересувний боковий трубопровід

efficient use

3.3. Give Ukrainian equivalents of the following words and word-combinations:

uniform application, rotating sprinkler head, perforated pipes, economical use, intake rate, light soil, evaporation, shallow streams, land preparation, safe irrigation, sandy soil, cropping, field ditch, fixed jets, debris, windy climate, widespread use, precipitation rates, fully portable system, pumping plant.

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