Geography A-Level
Lag Time
What Lag Time means in Geography A-Level, as defined for Pearson Edexcel.
Definitions of Lag Time
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
The temporal interval between peak precipitation and peak discharge, indicating the efficiency of basin drainage and flood risk.
The time difference between peak rainfall and peak river discharge on a storm hydrograph.
Topics that use Lag Time
- The Water Cycle and Water Insecurity (Pearson Edexcel A-Level)
Related terms
- Albedo Feedback
- Anthropogenic Modification
- Aquifer
- Clausius-Clapeyron Relationship
- Cryosphere
- Drainage Basin Dynamics
- Eustatic Sea Level Rise
- Eutrophication
Using Lag Time in the exam
Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.
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