By John Lee.
A new report by the U.S. Army Corps of Eengineers (USACE) says that the probability of Mosul Dam collapsing is even greater than was previously believed.
According tohe problem is that the dam was shoddily built on unstable ground: The earth underneath it is constantly being eroded by water. Since it was opened in 1985, maintenance crews have had to continuously pour cement under its foundation — a process known as "grouting".
U.S. officials have estimated more than a half million people could be killed if the 113-metre high dam collapsed.
Italian engineering firm Trevi Group is set to sign a contract to shore up the dam, but this has been described as a temporary solution.
The only permanent solution is building a second dam, which could cost upward of $2 billion, but there are currently no plans in place to build it.