Posted: 2:29 pm PT
In February 2016, the US Embassy in Baghdad released a fact sheet on Mosul Dam. It warned that in the event of a dam failure, the floodwave would resemble an in-land tidal wave between Mosul and Samarra’, and would sweep downstream anything in its path, including bodies, buildings, cars, unexploded ordinances, hazardous chemicals, and waste. It notes that less than 6 inches of moving water is strong enough to knock a person off his feet, and 16 inches of moving water can carry away most automobiles. Flooding south of Samarra would resemble that of Hurricane Katrina, with standing water that pervades much of Baghdad for weeks to months. As floodwaters recede, mud and waste-covered remnants of previous infrastructure will be left behind. Flood water could reach depths greater than 45 feet in some parts of Mosul City in as little as one to four hours, giving residents little time to flee. Flood water could reach Tikrit in one to two days. Flood water could reach Baghdad in three to four days and have depths of up to 33 feet in the river channel. Some parts of Baghdad would be flooded, which could include Baghdad International Airport (see US Embassy Baghdad Issues Warning on Possible Collapse of Iraq’s Mosul Dam).
The State Department’s July 2016 Travel Warning notes that the Government of Iraq has taken measures in improving the structural integrity of the dam but urged contingency planning for those who reside in the floodplain. The same Travel Warning also notes that the ability of the Embassy to assist U.S. citizens facing difficulty is extremely limited.
The Government of Iraq has begun to take measures to improve the structural integrity of the Mosul Dam. A dam failure could cause significant flooding and interruption of essential services from Mosul to Baghdad. While it is impossible to accurately predict the likelihood of the dam failing, the Embassy has made contingency plans to relocate its personnel in such an event. The Embassy recommends that U.S. citizens in Iraq, especially those who reside in the floodplain of the Tigris River, prepare their own contingency plans, have valid U.S. passports, and stay informed of local media reports and Embassy security messages for updates.
Dexter Filkins has a new story in @NewYorker (subscription) about the potential coming flood if the Mosul Dam collapses and cause a “catastrophe of Biblical proportions.” Earlier this month, Al Jazeera also reported that the Mosul Dam collapse ‘will be worse than a nuclear bomb’. Apparently warnings by scientists and environmentalists about an imminent collapse are dismissed by Iraqi officials as far-fetched.