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IB ESS SL 4.1.6 Water Body Steady State Questions

Explain how inputs and outputs can maintain a water body in steady state.

Syllabus
First assessment 2026
Course
ESS SL
Level
SL

Exam points

  • define steady state in a water body as a condition in which inputs and outputs are balanced and storage remains approximately constant
  • calculate or explain changes in stored water using rainfall inputs, extraction outputs and water-supply data
  • evaluate whether water use is sustainable by comparing storage, recharge, demand, water quality, environmental needs and management capacity

IB ESS SL 4.1.6 Water Body Steady State Questions question 1

[Maximum number: 1]
Figure 5: Dam storage, urban and agricultural water use, and rainfall in the Western Cape, South Africa, 2014–2018

Figure 5: Dam storage, urban and agricultural water use, and rainfall in the Western Cape, South Africa, 2014–2018

Outline one reason for the variation in the volume of water stored in dams, as shown in Figure 5.

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