It is a short story, included in a collection, that I read a long while ago (at least 10 years ago). Set in Central(?) Africa and features some sort of lake/dam super building/engineering project.
Reference is made to an apocalyptic war/trauma event throughout the story, but it is only at the end of the story that it is revealed that the event concluded with what amounted to white genocide.
I'm looking for the title, author, and if possible what collection/s it appeared in (or any of the above).