According to your last link, they actually began building a second dam further downstream in the 90s:
> A second structure, the Badush dam, was started 20km downstream, to prevent a catastrophe in the event of the Mosul dam’s failure. But work on Badush halted in the 1990s because of the pressure of sanctions, leaving it only 40% complete.
EDIT: Your last link is the same as the submission.
> A second structure, the Badush dam, was started 20km downstream, to prevent a catastrophe in the event of the Mosul dam’s failure. But work on Badush halted in the 1990s because of the pressure of sanctions, leaving it only 40% complete.
EDIT: Your last link is the same as the submission.