IB ESS 4.1.6 Water body steady state
IB ESS 4.1.6 Water body steady state

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise modelling water bodies as steady-state systems, balancing inputs, outputs and sustainable removal rates.
How this is tested
- use a flow diagram to distinguish inputs, outputs and storage in a water body
- calculate a sustainable harvesting rate from inflow, outflow and storage-change data
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