This comparison covers Large-Scale vs Small-Scale Water Management — The Exam Comparison within Water Resource Management for GCSE Geography. Revise Water Resource Management in The Challenge of Resource Management for GCSE Geography with 15 exam-style questions and 26 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 8 of 14 in this topic. Use this comparison to connect the idea to the wider topic before moving on to questions and flashcards.
⚖️ Large-Scale vs Small-Scale Water Management — The Exam Comparison
| Factor | Large-Scale (Three Gorges Dam) | Small-Scale (Sand Dams / Fog Catchers) |
|---|---|---|
| Cost | ~$25 billion; requires government/foreign finance | $500-$15,000; affordable at community level |
| Population served | Electricity for ~100 million; flood protection for millions downstream | Hundreds to a few thousand people per scheme |
| Displacement | 1.2 million people displaced | None — no flooding of land |
| Environmental impact | Major: biodiversity loss, sediment trapping, landslides, river delta erosion | Minimal: passive collection, no rivers blocked |
| Community ownership | State-owned; communities have limited input | Community-built and managed; strong local ownership |
| Reliability | High — consistent output regardless of season | Variable — fog catchers need coastal fog; sand dams need seasonal rivers |
| Scalability | Can address national-level water and energy needs | Cannot supply cities or large-scale agriculture |
| Speed of impact | Years/decades to plan and build | Weeks to months to implement |
| Best suited for | National energy/flood/water challenges in large countries | Remote rural communities in LICs needing immediate improvement |
A Level 3 exam answer would conclude: both approaches have an important role — large-scale schemes address national challenges but carry high social and environmental costs; small-scale solutions are more sustainable and equitable for local communities. The question is not which is "better" in general but which is appropriate for the specific context.
Practice questions for Water Resource Management
What is the difference between physical and economic water scarcity?
Explain three reasons why global demand for water is increasing.