From mid-March to April 2019 widespread flash flooding affected large parts of Iran, most severely in Golestan, Fars, Khuzestan, Lorestan, and other provinces. Iran has been hit by three major waves of rain and flooding over the course of two weeks which led to flooding in at least 26 of Iran's 31 provinces and at least 70 people died nationwide as of 6 April, according to the officials. The first wave of rain began on 17 March, leading to flooding in two northern provinces, Golestan and Mazandaran with the former province receiving as much as 70 percent of its average annual rainfall in single day. Several large dams have been overflowed, particularly in Khuzestan and Golestan, therefore many villages and several cities have been evacuated. About 1,900 cities and villages across country have been damaged by severe floods as well as hundreds of millions of dollars of damage to water and agriculture infrastructure. 78 roads were blocked and the reliability of 84 bridges was questioned.
Severity of the floods was greatly increased by converting flood routes and dry river beds for urban development without providing proper drainage infrastructure. According to an Iranian official, due to record rainfalls, more than 140 rivers have burst their banks and about 409 landslides have happened in the country. The impact of the floods was heightened because of the Nowruz holiday; many Iranians were traveling and many deaths occurred due to flash flooding on roads and highways. Around 12,000 km of roads were damaged by the flooding, about 36% of Iran's national road network. The floods caused US$4.1 billion in damages, in which US$1.5 billion was the agricultural damage. Further, according to Red Crescent, two million people are in need of humanitarian aid due to the devastating floods.
Civil and armed forces have been mobilized since 24 March after the command of Ali Khamenei, Iran's Supreme Leader, and vice President, Eshaq Jahangiri, along with several ministers as well as army commanders have traveled to the areas affected by floods. However, the lack of government aid and delayed response at the first days quickly heightened political tensions throughout the nation. Many Iranians including politicians took to social media platforms to criticize the handling of the floods by the government, specifically President Hassan Rouhani. Civilian outrage ultimately led to deadly clashes between protesters and government soldiers. The floods prompted a large outcry against the government rule which was perceived as worsening the floods through destructive measures such as the destruction of natural plant coverage, obstruction of flood outlets, and converting flood routes and dry river beds to residential areas following the Islamic Revolution.
Locations Golestan and Mazandaran
On 20 March 2019, massive rainfall in the two provinces of Golestan and Mazandaran in Iran brought about heavy flooding. These floods resulted in financial damages to the people living in these areas and also the deaths of two children. State-run media reports indicated that flash floods had surfaced in 70 villages in Golestan and more than 200 villages in Mazandaran. Iran's Minister of Energy also reported that 360 villages in Golestan province and 193 villages in Mazandaran province had lost electricity due to floods. Coincident with Iran's national holiday, Nowruz.
The first wave of rain began on 17 March, leading to flooding in two northern provinces, Golestan and Mazandaran with the former province receiving as much as 70 percent of its average annual rainfall in a single day. Several large dams have overflowed, particularly in Khuzestan and Golestan, therefore, many villages and several cities were evacuated. In many areas, homes and lands have been partially or totally submerged for several days. Portions of Golestan province received 50-70 percent of their average annual rainfall over a five-day period. Some areas recorded approximately of rainfall, equivalent to a year's-worth of rain. These amounts exceed any accumulations in the region in at least 70 years. The flooding in Golestan and Mazandaran provinces is considered a 1-in-100-year event.
On 6 April 2019, about two weeks after the flood, the town of Aqqala in the northern province of Golestan, is still covered with lethal flood. Local authorities say "they have to wait for the water to vaporize".
The governor of Golestan province was also reportedly on vacation outside the country during the floods. Later, he was dismissed by the vice President.
Shiraz
On 25 March, flash floods following heavy rains in Southwestern Iran in the vicinity of the city of Shiraz killed 19 peopleDeath toll from Iran flooding rises to 44, say officials 28 March 2019 at 8:00 pm and injured more than 200 others. Many people were traveling for the Nowruz holiday, and were injured or killed when their cars were swept off of roads. Rain was short but heavy, lasting in two bursts of approximately 15 minutes each; however, the impact was exacerbated by the heavy road traffic at the time. Iran's Meteorological Organisation gave warnings for further floods, as heavy rains were expected to last at least until 27 March. The leader of the Iranian Ministry of Energy has stated that climate change was a contributing factor to the flooding. As of 26 March 2019, 20 of Iran's 31 provinces are either currently flooded or facing the possibility of imminent flooding.
According to a dissident news organization, local sources reported that as many as 150 people were killed in the floods in Shiraz on 25 March. Official reports, however, indicated that a total of 21 people were killed in Fars province, which includes Shiraz, by 5 April.
A brief but intense rainfall caused a sudden flash flood that submerged the main highway between Shiraz and Esfahan, trapping many travelers who had been leaving the city after Nowruz celebrations. City officials did not warn the people of Shiraz of the deadly weather conditions resulting in many deaths.
The initial investigations of the Shiraz flash floods showed that a water canal adjacent to the Quran Gate was paved over in the early 2000s for use as a road by the Shiraz municipality. The road expansion did not include a sufficient drainage system.
Lorestan
The railway between Tehran and southwestern Iran had already been shut down on 1 April following initial floods.
Heavy rains on 3 April, have completely overwhelmed several towns in the mountainous Lorestan province. The town of Poldokhtar in Lorestan province was engulfed by flood water. After the floodwaters subsided, cars and homes remained sunken in thick layers of mud. According to a dissident news agency, an internal police report stated that at least 90 people were killed when floods engulfed the western city of Poldokhtar in Lorestan province. According to the IRGC-affiliated Tasnim News Agency, Heydari said that the conditions in Poldokhtar were "horrific".
At least 150,000 people were evacuated within the province.
Khuzestan Due to heavy rain fall in Zagros Mountains, Dez River and Karkheh River overflowed and water accumulated in Dez Dam and Karkheh Dam so that Karkhe dam's reservoir located in Khuzestan province, reached to 8400 m3/sec. As dams reached to their maximum capacity, power ministry of Iran managed to release water.
On 31 March the Government of Iran declared a state of emergency for Khuzestan province. President Hassan Rouhani deployed "all available capacities" to assist victims.
Khuzestan's governor Gholamreza Shariati ordered six towns and cities and about 70 villages located along the Karkheh River have to be evacuated, but about Ahvaz, Khuzestan's capital is not an injunction for evacuation. 47 camps in the province have been prepared to house for 30,400 people.
In order to prevent disaster occurrence, the Karkheh Dam, which was at near capacity, was opened to discharge excessive water.
On 8 April 2019, 20 lifeboats for rescue works in Iran floods was donated by Germany. Khuzestan Red Crescent Society Director Ali Khodadadi said officials will use them for rescue operations in Dasht-e-Azadegan, Shush, Shushtar, Ahvaz and other regions located in the southwestern Khuzestan province.
During the second week of April, about 200 villages had been evacuated, with 46,000 people displaced and living in emergency shelters. In total, 6 cities and 210 villages were inundated.
In Ahvaz, 110 patients were evacuated from a hospital for the mentally ill on 8 April, according to a government news agency.
Tehran A major rockfall caused by heavy rains on 31 March injured five people.
Kermanshah At least 19,000 people were evacuated from their homes following floods on 31 March.
Isfahan On 31 March, Golpayegan Dam located in Isfahan province near the borders with Markazi and Lorestan provinces filled, therefore the people residing in the areas near the downstream of the dam and river banks were warned to evacuate their homes.
Other cities On 25 March, there was a warning because of flood in some 26 provinces of 31 and villages near rivers and dams in several provinces have been ordered to evacuate from rising water. In Hamedan, heavy snowfall was reported to have destroyed buildings. Water levels in Lake Urmia, in northwestern Iran, rose by 42 cm by 5 April.
On 14 April, Officials warned people living in the east of Iran, because of heavy rains forecast.
Causes Using NASA's data, an atmospheric river (AR), named AR Dena, was found responsible for the record floods of March 2019 in Iran. This rare AR started its long, 9000 km journey from the Atlantic Ocean and travelled across North Africa before its final landfall over the Zagros Mountains. Water transport by AR Dena was equivalent to more than 150 times the aggregated flow of the four major rivers in the region (Tigris, Euphrates, Karun and Karkheh). This event was a compelling example of rapid dry-to-wet transitions and intensification of extremes, resulting from the climate change.
Climate change According to an Aljazeera report, the recent floods arose from climate change and global warming. The head of Iran's meteorology service stated that a decades-long drought has not been solved by the flood.
Damage Province Deaths Agricultural damage (preliminary) Fars province 23 US$77.4 million Lorestan 15 US$94.1 million Golestan province 8 US$480.0 million Mazandaran 6 US$166.4 million Hamadan 5 N/A North Khorasan 3 US$28.9 million Rasht/Qazvin 2 N/A Kohgiluyeh and Boyer-Ahmad 2 US$58.2 million Khuzestan 1 US$138.2 million Kermanshah 1 US$33.0 million Semnan province 1 US$5.7 million Qom 1 N/A Razavi Khorasan 1 N/A Chaharmahal and Bakhtiari 0 US$45.3 million Isfahan 0 US$22.8 million Sistan and Balochistan 0 US$5.9 million Total 77+ 1.1+ billion USD The flooding caused the destruction of hundreds of millions of dollars of infrastructure and the collapse of at least 314 bridges across the country. Twenty-three of the nation's thirty-one provinces were affected. Agriculture suffered tremendous damage, with losses in the sector reaching 46 trillion rials (US$1.1 billion) by 3 April. Golestan accounted for the largest portion at 20 trillion rials (US$480 million). At least 25,000 houses were completely destroyed, while another 60,000 sustained some form of damage. 44 public libraries in Iran also suffered flood damage. According to reports from Aljazeera, out of 800 villages affected by the flood in Golestan, 95 villages are yet to recover from it.