The purpose of this activity is to conduct a basic measure of the surface outflow of a watercourse and outflow characteristics. By measuring the speed at which a tennis ball travels down a 10 metre stretch of the watercourse., in addition to the watercourses' cross sectional area we can then calculate discharge. This can indicate the gradient of the river and also the nature of the bedload as water travels faster over an unobstructed riverbed.
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