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The storm hydrograph is one of the most important analytical tools in hydrology. It shows how a river responds to a single rainfall event, revealing the speed and magnitude of the catchment's response. Interpreting hydrographs and explaining the factors that control their shape is a core skill for AQA A-Level Geography Paper 1.
Key Definition: A storm hydrograph (flood hydrograph) is a graph showing river discharge (m³/s) on the y-axis against time on the x-axis, illustrating the change in a river's flow in response to a precipitation event.
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