Before revision: In riffles, these patches form at a velocity between 13 and 89 cm s−1 , which allows for certain types of litter to be more abundant in riffles because they can stand up to the flow.
After revision: In riffles, these patches form at a velocity between 13 and 89 cm /sec , which allows for certain types of litter to be more abundant in riffles because they can stand up to the flow.