Translate the following words into English using the vocabulary of the text

Использовать природные ресурсы; развитие водных ресурсов; проявляться в запасах воды; использование гидравлического сооружения; осушительные и оросительные системы; применение инженерных правил; инженерия по использованию водных ресурсов; паводковый контроль; дренаж и канализационные системы; улучшение навигации; управление экосистемой; предотвращать разрушение; указывать на развитие науки в будущем.

27. Read the following text and fill in the missed words.

a) quantity g) needed l) economic

b) accurately h) power m) tests

c) demands i) create n) chemical

d) provide j) water-supply o) methods

e) quality k) acceptable p) determine

f) water-resources engineer

The job of ____1____ may be limited by a number of basic questions associated basically with the ____2____ and quality of water. The first question is: "How mush water is ____3____?" This is probably the most difficult of all design problems to answer ____4____, because it involves social, ____5____ and engineering aspects. Basically the answer depends on future ____6____ for irrigating crops, domestic water and hydro­electric ____7____.

Being adequate in quantity, water must often withstand cer­tain ____8____ of quality. Thus the second question is: "What is the ____9____ of water?" Problems of water quality are encountered in planning ____10____ and irrigation projects. Polluted streams ____11____ many problems. Therefore in order to ____12____ the amount and character of impurities in water it is necessary to employ ____13____ and bacteriological tests. The effect of these impurities on water quality - must be evaluated and set standards of ____14____ quality. The engineer must then ____15____ the necessary facilities for removing impurities from the water by mechanical, chemical or bacteriological ____16____.