Unit 7: Option A — Freshwater: Drainage Basins
Topic 7.1: Drainage basin hydrology and geomorphology Questions
Practice 20 exam-style questions for IB Geography Topic 7.1. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Estimate3 marks
The table shows the peak annual discharge of a small river recorded in two decades.
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Explain how the processes of erosion and deposition together form a meander.
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Outline how river discharge and hydraulic radius are related as you move downstream.
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A small drainage basin's discharge rose after its land use changed. Outline two land-use changes that could explain this rise, and state how each increases run-off.
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The table gives the grid positions of four points along a large river basin (1 grid unit = 40 km).
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Explain the sequence of depositional processes by which a river builds a delta.
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Outline two physical factors, other than rock type, that can make a drainage basin respond quickly to a storm.
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The table shows the velocity of a river and the largest sediment it can carry at four points along its course.
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The table lists some of the world's tallest waterfalls.
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Explain how the differential erosion of hard and soft rock produces a waterfall.
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Lag time on a storm hydrograph is the gap between…
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Explain how the permeability of the rock in a drainage basin affects the stores and flows of water within it.
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The storm hydrograph below shows rainfall and the discharge of two contrasting basins after one storm.
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The table tracks four parts of a drainage-basin system as a share of the rainfall during one rainfall event.
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2026
Calculate the total volume of precipitation falling on the drainage basin in one year.
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Which factor would lengthen a basin's lag time?
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2026
State what lag time means on a storm hydrograph.
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A delta is most likely to form where a river…
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River discharge is the volume of water passing a point each…
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A drainage basin is the area of land that is…
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