Water inflow into Tehran dams has decreased by about 27 percent since the start of the wet season, in Iran which started in November.

Mohammad-Reza Bakhtiari, the managing director of Tehran province Water and Wastewater Company, said on Saturday that input of the five dams around the capital has decreased to over 620 million cubic meters, while the figure was about 855 million cubic meters in the same period last year.

He added that the current volume of water reserve in Amir Kabir, Latian, Lar, Taleghan and Mamlu dams is 97, 60, 67, 232 and 71 million cubic meters, respectively.

According to Bakhtiari, rainfall was also down 31 percent from the beginning of the wet season to 164.1 millimeters, down from 218.9 millimeters in the same period last year.

Head of Iran's Geological Survey and Mineral Explorations Organization, Alireza Shahidi, has recently said that the country is in a 30-year drought cycle, noting that the dry spell started about 10 to 20 years ago and now its effects are more observable.

In 2021, large-scale water protests took place in two important provinces, Khuzestan and Esfahan, with several people killed and hundreds injured by security forces.

As drought persists, more underground water is exploited for irrigation, depleting natural reservoirs formed during thousands of years. However, politicians and experts say that there are no consistent government plans to deal with the water crisis, which can result in mass migration of millions of people in the next ten years.