Why are moments called watershed?

On Thursday, New York Democratic Senator Kirsten Gillibrand commented on the ongoing allegations of sexual harassment against prominent men in politics and entertainment, notably including Matt Lauer and Garrison Keillor just this week:

I think we are in a watershed moment where it’s going to be an important change for our women, for our daughters, for men and for society about what we deem is acceptable. And in the world we live in today, we won’t tolerate abuse of power and position in any form from anyone.

Across chambers, and across the aisle, Speaker of the House Paul Ryan echoed Gillibrand’s sentiments and language to National Public Radio: “We are having a watershed moment in this country. I think this is a defining moment in this country. And I think it needs to be a defining moment in this country.”

We so often describe “defining moments” of “important change” as “watershed moments.” But what it so pivotal about a watershed?

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Which way will the water go? (Pixabay)

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