There are expressions whose currency is due to no good reason, but simply reflects the suggestibility of people. Let someone prominently placed commit a linguistic howler, and you can be sure that others will fall in line. The perfectly good word ‘affect,’ used as verb, has fallen into desuetude to be replaced by the miserable ‘impact’ used as a verb. Thus, ‘Mary was deeply impacted by her father’s death.’ You mean her sire’s demise induced constipation in the poor girl? Why this barbarism when ‘Mary was deeply affected by her father’s death’ is available? Part of the answer has to be that people are lemmings who uncritically repeat whatever they hear.

'Impactation' is correctly used in this curious medical article dredged up from the bowels of the Internet: Rectal Impactation Following Enema With Concrete Mix.