Hydrographs and Flooding (OCR GCSE Geography A (Geographical Themes)): Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the unit of measurement for river discharge?
What is the unit of measurement for river discharge?
Cubic metres per second
What does a hydrograph show?
What does a hydrograph show?
Discharge changes over time vs rainfall
What is peak discharge?
What is peak discharge?
Maximum amount of water held in channel
What is lag time?
What is lag time?
Time between peak rainfall & peak discharge
What does the rising limb on a hydrograph show?
What does the rising limb on a hydrograph show?
Increase in discharge
What is base flow?
What is base flow?
The normal discharge of the river
How does a lack of vegetation affect lag time?
How does a lack of vegetation affect lag time?
Causes shorter lag time
Why does plenty of vegetation lead to a longer lag time?
Why does plenty of vegetation lead to a longer lag time?
Plants intercept rainfall
What is the effect of short lag time on flood risk?
What is the effect of short lag time on flood risk?
Increases flood risk
Why does prolonged rainfall increase flood risk?
Why does prolonged rainfall increase flood risk?
Soil becomes saturated & can't infiltrate
How does deforestation affect flood risk?
How does deforestation affect flood risk?
Increases flood risk
Why do impermeable surfaces in urban areas increase flood risk?
Why do impermeable surfaces in urban areas increase flood risk?
They increase runoff