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Unconfined Aquifer

evapotransporation - суммарное испарение; stream - водоток; река; precipitation – осадки; (un)saturated zone – (не) насыщенная зона; water table - уровень подземных вод; ,unconfined aquifer – безнапорные; capillary fringe - капиллярная зона; confined (artesian) aquifer - напорные воды

An aquifer under atmospheric pressure which is only partially filled with water. The top of the saturated area is known as the water table. It is also known as a water table aquifer.

(www.Wikipedia)

15. Read the texts once more carefully and choose the correct alternative for these words and words combinations.

1.sideways

5. confined aquifer

2. erosion

6. rain, snow belong to

3. stop \ catch smth

7. vaporization

4. be in a very small space between two other things

8. water table

16. Find in the texts words with the opposite meaning to the following ones.

1. permeable

2. artesian aquifer

3. saturated zone

4. hillrise

17.Match the words in the right column with the words in the left one.

1. saturated

A. aquifer

2. artesian

B. bedrock

3. permeability

C. zone

4. atmospheric

D. pressure

5. impermeable

E. layers

6. depositional

F. table

7. unconsolidated

G. sequences

8. fractured

H. outwash

9. water

I. limestone

10. glacial

J. materials

18. Read underlined key hydrogeology terms and fulfill the after-reading exercises.

Artesian well -a well whose source of water is a confined (artesian) aquifer. The water level in artesian wells stands at some height above the water table because of the pressure (artesian pressure) of the aquifer. The level at which it stands is the potentiometric (or pressure) surface of the aquifer. If the potentiometric surface is above the land surface, the well is a flowing artesian well.

Capillary fringe - the area of the saturated zone just above the water table in which water is held in the soil by surface tension

Cone of depression - the conical-shaped depression of the water table around a pumping well caused by the withdrawal of water; a valley in the water table. Because of pumping, ground water in the vicinity of the well will deviate from the natural direction of ground water flow and flow towards and into the well.

Confining layer- layer of geologic material which hampers the movement of water into and out of an aquifer. Examples are unfractured igneous rock, metamorphic rock, and shale, or unconsolidated sediments such as clays. This is also known as a confining bed.

Consolidated rock –solid rock that underlies soils; consists of mineral or rock particles of different sizes and shapes that have been welded into a mass by heat and pressure or by chemical reaction. This rock must contain interconnected pores or fractures to serve as an aquifer.

Discharge the volume flux of water.

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