O-LevelGeographyThe natural environmentMay/June 2013Paper 2 Q830 Marks
Two groups of students were investigating the characteristics of a local river which flowed for 15 km from its source to the sea. They wanted to investigate possible reasons for changes in velocity (speed of flow) downstream. They carried out their fieldwork at five sites along the course of the river. They decided to test the following hypotheses: Hypothesis 1: Velocity increases as the river bed slopes more steeply. Hypothesis 2: Velocity increases as the wetted perimeter of the river channel increases.
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