Safety of Mosul and Haditha Dams, West Iraq as Affected by Karstification

Mosul and Haditha dams are two large earthfill in Iraq constructed on the Tigris Euphrates rivers, respectively. The were almost at same period mid-eighties of last century. Both suffer from karstification within their foundations. In former, however, problem is more severe than latter. Dam was karstified gypsum limestone beds; different grouting techniques used, but works still going to keep dam as safe possible sealing foundation hampered by type geology. rocks also. To avoid effect safety this dam, an exceptionally long grout curtain treatment work. length extended under concrete structures river channel beyond abutments forming left right sides extensions cut off water percolation around which could cause formation sinkholes. depths all parts varied following zones intensities. details both discussed using updated data relying experience authors. current status also with some recommendations possible.