Mike, it's just another term, in a long string of descriptors, that this group uses interchangeably. They seem to change up what they call these earthen embankments, based on what they think will distract from the real truth, most effectively, at the given moment.
On a happy note, I have B-I-N-G-O now.
So far this week, only 4 days old, I've seen this Facebook group call these Canal Embankment Dams 5 different things:
Members of this FB group have used Riverbank (again), Levee (again), Canal Banks (again), a "garden" (new term), and the catch all, Earthen Embankment. I also might have seen hillside, slope and berm.
Now it's a new "mashup" of a few old names in this new one you mentioned, a Levee Embankment.
But the real name, used by most with a knowledge of what these structures do, and how they were made, is either an Earthen Dam or Embankment Dam.
I still prefer the descriptive term though, water impounding structure. Because it really does matters what's on the "other side" of the earth that the invasive vegetation is growing on. And if that happens to be WATER on the other side of those "trees" (the majority of time) then it is called a DAM, plain & simple.
And these members do know that trees are NOT allowed on Dams, only turf grass is approved to cover them, for protection of the DAM and the PUBLIC below.
What's next? Maybe a new thing, called a "leveeberm"