For the same discharge, gradient, and channel cross section, a stream with a boulder-strewn bed would be more turbulent than one with a sandy bed.

Question

Quizplus · Accepted Answer

Boulders create more obstructions and irregularities in the flow of water, causing it to become more turbulent as it moves around and over them. A sandy bed, on the other hand, is relatively smooth and does not disrupt the flow of water as much, resulting in a less turbulent stream.

For the Same Discharge, Gradient, and Channel Cross Section, a Stream