19.Match the English term with the Russian one.

1. сapillary fringe	A. откачка
2. overwithdrawal	B. оседание почвы
3. drawdown	C. безнапорные воды
4. watershed	D. режимная скважина
5. permeability	E. капиллярная зона
6. subsidence	F. напорные воды
7. discharge	G. разгрузка
8. unconfined aquifer	H. водоупор
9. water table well	I. проницаемость
10. artesian aquifer	J. понижение уровня вод
11. confining layer	K. уровень подземных вод
12. water table	L. водораздел

20. Match the terms with the definitions.

1. artesian well	A. a place where ground water naturally comes to the surface at the intersection of the water table and land surface.
2. consolidated rock	B. a valley in the water table.
3. spring	C. the vertical drop of the water level in a well caused by ground water pumping; also, the difference between the water level before pumping and the water level during pumping.
4.cone of depression	D. the spaces between particles within geological material (rock or sediment) occupied by water or air.
5. subsidence	E. the process by which over-pumping from an aquifer creates a flow imbalance within an area, which results in salt water encroaching into and contaminating a freshwater supply.
6. drawdown	F. a well whose source of water is a confined aquifer.
7. ground water aquifer	G. all the land area and water within the confines of a drainage divide in which all surface runoff will pass through an identifiable outlet, such as a stream or river.
8. pores	H. this rock must contain interconnected pores or fractures to serve as an aquifer.
9. salt water intrusion	I. the sinking or depression of the land surface as a result of too much ground water withdrawal.
10. saturated zone	J. all water beneath the land surface. It includes water in the saturated and unsaturated zones.
11. underground water	K. the subsurface zone in which all pores in the aquifer are filled with water.
12. watershed	L. a water-bearing layer of rock or sediment capable of yielding usable quantities of water

21. Look at the diagrams below and describe them. Use the following words and word combinations.

1. ground water, conical-shaped depression, pumping well, vicinity, deviate from.

2. beneath the land surface, saturated zone, unsaturated zone, filled with.

3. source of water, water table, unconfined aquifer, water level, some height above, the level at which.

Fig. 1

Fig.2

Fig.3