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A-level Geography

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Question 11 mark
  • A-level Geography: AQA 7037, Edexcel 9GE0, OCR H481
Spec and skills
  • Paper scope: AQA Paper 1 · Edexcel Paper 1 · OCR Physical systems and Geographical debates
  • Spec AQA 3.1.1.2
  • Spec Edexcel Topics 5.2 and 5.3
  • Spec OCR 1.2
  • Topic spec AQA 3.1.1.2
  • Topic spec Edexcel Topics 5.2 and 5.3
  • Topic spec OCR 1.2
  • Skill: p02-hydrographs-s1
  • Learning check

The hydrograph shows one storm. Take peak rainfall as 12:00, the end of the wettest two-hour period. What is the lag time?

A storm hydrograph for an upland river: discharge is 3 cumecs at 06:00, rises steeply from 10:00 to a peak of 24 cumecs at 16:00, then falls more gently to 4 cumecs by 04:00.Discharge (cumecs). 06: Discharge (cumecs) 3; 08: Discharge (cumecs) 3; 10: Discharge (cumecs) 4; 12: Discharge (cumecs) 7; 14: Discharge (cumecs) 15; 16: Discharge (cumecs) 24; 18: Discharge (cumecs) 21; 20: Discharge (cumecs) 15; 22: Discharge (cumecs) 10; 00: Discharge (cumecs) 7; 02: Discharge (cumecs) 5; 04: Discharge (cumecs) 4Discharge (cumecs)051015202506081012141618202200020433471524211510754Discharge (cumecs)Hour (24-hour clock)
Chart values
CategoryDischarge (cumecs)
063
083
104
127
1415
1624
1821
2015
2210
007
025
044
  • 8interactive lessons
  • 328practice questions
  • 20data-response sets with original figures

AQA, Edexcel and OCR A-level

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7 topics

  • Water and carbon cycles2
  • Coastal and glaciated landscapes1
  • Hazards and ecosystems1
  • Places and urban change1
  • Statistics2

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Independent practice for AQA (7037), Pearson Edexcel (9GE0) and OCR (H481) A-level Geography. Not affiliated with or endorsed by AQA, Pearson or OCR; every question and figure is our own.

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