Iran: Disruptions due to flooding ongoing in parts of Mazandaran Province as of June 27

Flood-related disruptions are ongoing across parts of Mazandaran Province as of June 27. Savadkuh County is the worst affected area after heavy rainfall overnight June 25-26 triggered widespread flooding along the Telar River. Authorities have reported at least 24 people have been injured, and five others are missing. The road between Tehran and Qaem Shahr has been closed due to the flooding. Several other roads, homes, vehicles, areas of agricultural land, and other infrastructure have been damaged by the severe weather. Response operations are ongoing, and lingering disruptions are likely in flood-affected areas over the coming days. Further showers and thunderstorms are forecast over the region June 27-28; additional downpours will likely exacerbate the flood situation and hamper ongoing response and recovery efforts.

Further sustained heavy rainfall could trigger additional flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rain has saturated the soil.

Authorities could issue additional mandatory evacuation orders for flood-prone communities. Disruptions to electricity and telecommunications services may occur where significant flooding or landslides impact utility networks.

The severe weather will likely contribute to transport disruptions throughout the region. Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Additionally, ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters. Traffic and commercial trucking delays might occur along regional highways. Flooding downpours could flood some low-lying roads in areas with poor drainage. Strong winds might also pose a hazard to high-profile vehicles.

Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites.

Flooding could heighten the threat of disease outbreaks. Backflow from drains mixed with floodwaters can become trapped in open areas when inundations recede. These stagnant pools often become a breeding ground for mosquitoes and bacteria, increasing the incidence of insect- and water-borne diseases. Exposure to contaminated water from inundated industrial sites, sewer systems, and septic tanks also poses a significant health threat.