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1. A water supply system is a complex of …
A. engineers
B. engineered structures
C. hydrology and hydraulics
D. water purification plants
2. Water disinfection is accomplished with the help of …
A. dissolved calcium and magnesium salts
B. ultraviolet and sun light
C. harmful bacteria and microorganisms
D. chlorine or ozone
Salts of … are considered helpful in goiter and tooth decay prevention.
A. calcium
B. sodium
C. iodine and fluorine
D. magnesium
After water is used, sewage should be discharged into a ….
A. lake or river
B. reservoir
C. sewerage system
D. pumping station
Ion exchange is a means (средство) of … hard water.
A. purifying
B. disinfecting
C. softening
D. aerating
Water for industry, irrigation or fire fighting must meet … standards of purity … water for drinking.
A. lower… than
B. higher … than
C. the same … as
D. much higher … than
Ex. 10. Insert the appropriate word.
| abundance, artesian, discharge, engineering, fire, industry, street, pressure, public, shortage, suitable, treatment, water |
1. Should we test our drinking water if it comes from a … water supply?
2. Early people had no need of … structures to supply their water.
3. More than 60% of water supply in Minsk is from … sources in which natural … produces a constant supply of water with little or no pumping.
4. Water … is necessary to make water … for drinking or for any other use.
5. Some chemical enterprises … pollutants into water bodies.
6. A water supply system is an arrangement for transporting water from areas of … to an area of …. This includes works for the collection, transmission, treatment, storage, and distribution of water for homes, commercial establishments, …, and irrigation, as well as for such public needs as … fighting and … flushing.
Ex. 11. Translate the words and word combinations in brackets.
Some (горные породы) allow little or no water to flow through; these are known as (непроницаемый) rocks. Others are permeable and allow considerable storage of water and act as major (источники) of water supply; these are known as (водоносные пласты/ горизонты). Groundwater is water held underground in the (почва) or in pores and crevices in rock.
An aquifer in hydrology is a (проницаемый) rock layer that contains groundwater and releases it in appreciable (количества). The rock contains water-filled pore (пространства), and, when the spaces are connected, the water is able to flow (через/ сквозь) the matrix of the rock. An aquifer also may be called a water-bearing stratum or zone.
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| Ex. 6. Study and memorize the following pairs of derivatives. | | | TEXT B. Components of a Water Supply System |