Answer;
Competence
Competence is the measurement of the largest particles a stream can carry (increases with velocity).
Explanation;
A stream is defined as all channelized movement of water, including large movements of water in rivers, such as the Yangtze River and the Mississippi River
Stream competence is the size of sedimentary particle that can be carried, moved, transported in a channelized stream of water. Each stream has a competency for what size of sedimentary particle it can move by its force (volume and velocity). This competency may change as stream volume and flow of velocity change due to seasonal flooding and other factors of topography.
The difference between stream capacity and stream competence is that capacity measures quantity of sediment while competence measures size of particles comprising sediment.