Nowadays, shortage and decrease in fresh water is approximately under increased all
over the world. Based on the statistics published by FAO (Food and Agriculture organization),
need for fresh water has almost become double per 21 years, while useful water resources have
been reduced by half in relation to 30 years ago. It seems that useful water resources will
become one fourth up to 2025 than useful water resources in 1960. Meanwhile, danger of various
pollutions for water resources frequently increased the value and importance of them. Due to
mentioned cases, if water resources aren’t managed in better way, the life of human being will be
threatened by the shortage of water. Thus, it is necessary to acquire the exact and up to date
information about the condition of water resources and prediction of their situation in future in
order to achieve optimum management for water resources.
