الفهرس | Only 14 pages are availabe for public view |
Abstract Water is most important natural resource and life can not exist without it. Ecologists from all over the world are calling for the protection of fresh water against the uncontrolled use and pollution. In humid countries agriculture depends principally upon rainfall and rivers are rarelyused to irrigate the crops. In dry countries like egypt, rainfall is negligible and does not provide enough water necessary to meet the agricultural requlrements. In Egypt. |