Sand Overextraction Weakens Riverbanks as Concrete Demand Soars 2026

Sand overextraction from riverbeds is weakening riverbanks as concrete demand soars, according to a new study in Reviews of Geophysics. The demand for sand and gravel has more than doubled in the last two decades, leading to severe environmental consequences including weaker riverbanks, lower groundwater levels, coastal salt intrusion, and poorer water quality.

The Global Sand Crisis: A Growing Environmental Threat

In 2024, city-building and infrastructure projects worldwide consumed 28 billion tonnes of sand and gravel to produce concrete. Researchers who reviewed extraction data dating back to 1974 found that since 2000, demand has surged by over 100%, with more than 80% of current demand originating from Asia, particularly China and India, where rapid urban development and road construction are driving the need.

Much of this material is being extracted from rivers across Asia and Africa. While data on extraction is scarce, where available, it shows that extraction rates often exceed natural sediment replacement by severalfold. This unsustainable practice is causing rivers to deepen and widen, undermining the stability of riverbanks and the ecosystems that depend on them.

Environmental Consequences of Sand Overextraction

The impacts of sand overextraction are far-reaching:

• Weaker riverbanks – increased erosion and risk of collapse
• Lower groundwater levels – reduced water availability for communities and agriculture
• Coastal salt intrusion – saltwater contaminating freshwater aquifers
• Poorer water quality – increased turbidity and pollution

These effects not only harm the environment but also threaten human livelihoods, as millions rely on rivers for drinking water, irrigation, and fishing.

Data Comparison: Extraction vs. Natural Replenishment

This table illustrates the stark imbalance between extraction and natural replenishment, highlighting the urgent need for better management.

Solutions: Better Management and Sustainable Alternatives

Researchers suggest that satellite imaging and river mapping can be used to monitor and manage sand and gravel mining more effectively, helping to minimize negative impacts. Additionally, reducing demand is crucial. This can be achieved by using materials more efficiently and developing alternatives such as processed construction waste, recycled glass, and treated bottom ash from waste incineration.

Implementing these solutions requires policy changes, industry cooperation, and public awareness. By adopting sustainable practices, we can protect our rivers while still meeting the needs of a growing global population.

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