For a physical geography enquiry investigating downstream changes along a river channel, a student measured surface velocity at five locations using the float method (timing a buoyant object over a 5-metre distance).
Explain one way the student could improve the accuracy or reliability of the velocity data collected.
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.