Glad someone took some solid drone footage of this before the new Drone laws kicked in Canada. While we only have one professional FAA drone pilot onboard, and I'm not sure I want to also get certified in Canada, even if few people would enforce it in BC and SE Alaska (other then the eagles... and seagulls). :D
I've gone through when the tides were just perfect and made that channel on the East side a giant whirlpool. Seemed like the whole channel, but in reality probably about half the width. Not very big tides, but just the right mix.
Try getting some video of Roaring Hole Rapids on a big tide, it's much more impressive than Nakwakto, despite the lower speeds. (Nepah Lagoon) Only on a big ebb tide though, otherwise it's just average.
you have eight minutes to get through.... when it ebbs, it is draining over 80 miles of inlets, all uncharted...even the orca's know not to try to run Nakwakto...
"Rapids" is a common term applied to these types of tidal features. And since the definition of a word is just derived from how it is commonly used ... Also, check out this video, starting around 1:30, of Ford's Terror, AK (a place I visited in 1996). I don't see any significant whirlpools, so "rapids" seems like a much better term to describe them. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-q7qKyZItk_Y.html