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GCSE Geography · key term
The pattern of variation in a river’s discharge throughout a year.
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Specification 1.3.2 · Component 1
Revise: Causes and Effects of River FloodingAn annual regime is the pattern of variation in a river’s discharge throughout a year. It shows seasonal changes, rather than the response to one storm.
Specification 2.2.1 · Component 1, Component 2
The pattern of variation in a river's discharge over a year, commonly shown using mean monthly discharge.
Distinguish an annual regime from a storm hydrograph: one shows the seasonal pattern across a year; the other shows the response to a particular storm.
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An annual regime shows the pattern of discharge through the year, often using mean monthly discharge. Many UK rivers have higher discharge in winter, when evaporation and transpiration are lower and wet ground encourages run-off. Summer discharge is often lower because warmer conditions and active vegetation increase water losses to the atmosphere.
