Wave train
Also: wave train
A wave train is a series of irregular waves in a rapid. The size of the waves is one criterion of the difficulty grade.
In the scale, Wikibooks describes waves from “small” to “extreme”. Packrafts with plenty of freeboard and a spray deck or self-bailing cope well; open boats fill up quickly.
Sources and further reading
Research as of 13 Nov 2026. We have marked manufacturer information as such.