There’s over 600 miles of major levees in south Florida.
Even more confusing than that is that several of them go by the same name.
Or sort of:
As described in the video, the L-28 for example includes the tieback, interceptor, gap, borrow, north … and probably more, all of which are separate canals.
That’s why hydrologists spend lots of time studying maps!
(And even then we still get confused.)