An A-level student investigating downstream changes in a river basin uses a systematic sampling strategy to collect bedload samples at regular 3-kilometre intervals downstream from the source to measure clast roundness.
Explain one disadvantage of using this sampling strategy in this physical environment.
125 exam-style questions on Edexcel A GCSE Geography Investigating physical environments (rivers or coasts). Each one has a worked solution and a mark scheme showing where the marks go.