Автор работы: Пользователь скрыл имя, 23 Апреля 2014 в 08:35, реферат
Questions of meliorative water economic building are widely discussed now in our country in connection with deterioration of ecological conditions on the irrigated earths. Conditions are so serious that are cancelled by government «projects of a century» on a transfer of waters of northern and Siberian rivers on the south and to Central Asia, building of channels Volga - Chograj is suspended, Volga - Don-2, Rostov - Krasnodar other is published many critical materials about low economic efficiency of water managements, about negative ecological consequences, poor quality of the constructed hydraulic engineering constructions, the overestimated water consumption, the big losses of irrigating water, poor harvests on the irrigated earths etc.