Hydrological drought is associated with the effects of periods of precipitation (including snowfall) shortfalls on surface or subsurface water supply (i.e., streamflow, reservoir and lake levels, groundwater). The frequency and severity of hydrological drought is often defined on a watershed or river basin scale.

The researcher of Iran`s Climatological Research Institute, Iman Babaian said that during the next 90 years, rainfalls and snowfalls will decrease by 10 percent.

He also noted that according to forecasts, the temperature in Iran will increase by approximately 3-5 degrees in the mentioned period of time.

Babaian underscored that the groundwater resources in Iran will be decreasing as well, and will become extremely limited.

Back on July 22, ISNA reported quoting Iranian environmental issues expert Parviz Kordovani, that the Islamic Republic would suffer a hydrological drought, even if in the next 20 years, the overall rainfalls in Iran would increase by 20 percent.

The forecasts of Iranian experts come similar to the previously released NASA report, which said that Iran ranks 4th among 45 countries, which currently experience extreme drought.

The NASA report also said that this stage would go on in Iran for the next 30 years.

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