What's a "low-lying area?"

A commenter left us this question last night:

Which people should evacuate and what is considered low lying. I live in a third story apartment in summerville

We left an answer in comments (voluntary evacuations of low-lying areas are famously subjective and vague), but here's a more specific way of finding out whether your location is low-lying, at least from an insurance company perspective.

It's the Floodsmart.gov site's risk assessment page. Enter your address and you'll get a flood risk rating.

Turns out mine is "high."

Comments

[Sheo]

What is technical definition of "Low Lying Area"