Mosul Dam.

This is coolbert:

More on the Mosul dam that edifice now having been captured by ISIL.

"Mosul's Damn Dam"

"Last week, the barbaric Islamic State (IS) seized the vitally important Mosul dam, dramatically impacting tactical options against them and potentially changing the future of the Middle East."

"Since the dam was completed in the mid-1980’s it has required continuous (daily) maintenance, because it was built on top of gypsum, a soft mineral which dissolves when in contact with water. More than 50,000 tons of materials have been injected into the dam since 1986. The ‘sink hole’ type of cavities that constantly form have to be expeditiously plugged with 'grout', a liquefied mixture of cement and other additives."

"A dam break does not require sabotage. Maintenance failure has the same result."

Water as a weapon of war in the Middle East as you might well imagine having an ancient history.

Depriving an opponent of water or even FLOODING AN AREA tactics worthy of consideration. Too much water or too little water.

From the Siege of Baghdad in 1258 the Mongol breaking dikes and flooding an area, trapping an enemy cavalry force in the process.

"The cavalry were decisively defeated by the Mongols, whose engineers broke dikes along the Tigris River and flooded the ground behind the Abbasid forces, trapping them"

coolbert.