Современные проблемы промышленного и гражданского строительства на занятиях английского языка. Кузьмина Е.В. - 49 стр.

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Sometimes the rainfall finds its way into the soil and forms water bodies

at various levels because of the impervious nature of the under soil. Often a

water body deep in the soil consists of a sand or gravel stratum which connects

or empties into the basin of an inland lake and provides a splendid source of

water supply through the medium of a drilled well.

Man uses water for domestic and sanitary purposes and returns it to the

source through sewage disposal system. Industry likewise replaces water

diverted to its use. Hence the cycle is completed but it is of prime importance

that the supply be protected against pollution, for if it fouls no one can predict

how disastrous may be the results.

An adequate supply of pure, wholesome and palatable water is essential

to the maintenance of high standards of health and to provide the convenience

modern society demands. In some localities water is available in unlimited

quantities and converting it to use is not a difficult problem. This is especially

true of towns situated on large inland lakes or rivers. On the other hand there

are cities where geographical location requires elaborate systems of water

supply, and to provide a satisfactory supply of water in these localities becomes

a large engineering task.

The importance of a sufficient supply of water for domestic and industrial

purpose has long been a deciding factor in the location cities. The earliest

settlers realized this need and took advantage of natural water sources by

establishing colonies in close proximity to them

Water may be taken from any sources of water for human consumption

after it has undergone a preliminary treatment to assure its purity. As man’s

communities grew in population, the demand for water increased and the need

for protection of the source of water supply against the possibility of

contamination became evident. Progress and civilization have called for

elaborate and various systems and methods of water treatment.