| Summary: | Nowadays, the highest priority issue of water resources management is supply of increasing water demand with limited water resources. Water resources are a basis of sustainable development, so sustainable approach should be based on usage and management of water resources. In the twenty first century, the world is faced with a major water crisis. And the problems are originated from deficiencies and errors in the management of water resources. Thus, sustainable use of water resources is crucial for humanity. The sustainable development is defined as supply objectives and needs of today without jeopardizing objectives and demands of future generations. The long-term objectives instead of short-term ones should be considered in the assessment of water resources. Water resources are handled as a whole in basin management. This approachment constitutes the notion of integrated water resources management.
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