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"Years of abnormally low rainfall" - at what point does "abnormal" become normal?

Never. That might make it sound less like an emergency.

For example, one of the first things you'll read in the wikipedia article on "Drought" is this:

> The longest drought in recorded history started 400 years ago in the Atacama Desert in Chile and still continues.

So long as a settlement’s reason for its location has shifted drastically, never.