How Cities Run Dry: Drivers of Water Shortages and Policy Implications

The briefing examines the global trend of shrinking lakes and reservoirs, highlighting a study that found 53% of nearly 2,000 lakes experienced significant storage declines between 1992 and 2020. It distinguishes between anthropogenic drivers, such as unsustainable consumption seen in the Aral Sea, and climate drivers, such as increased evaporation in Mongolia. The author argues that this attribution allows policymakers to choose between demand management and behavioral changes for overuse, or infrastructure resilience and conservation for climate-driven losses.

• A comprehensive study of nearly 2,000 lakes worldwide found that 53 percent saw significant declines in water storage from 1992 to 2020. Over the last three decades, freshwater lakes globally have lost water storage every year equivalent to 17 times the volume of Lake Mead.
• The primary drivers of dwindling lake water levels are categorized into three areas: unsustainable water consumption, increasing temperatures and evaporation rates, and changes in precipitation patterns and runoff.
• Different drivers require distinct policy responses: unsustainable water use should be addressed via sustainable withdrawal rates, demand management, and behavioral changes, while climate-driven declines require adaptation strategies like water source diversification and infrastructure resilience.
• Specific examples illustrate these drivers: the Aral Sea has shrunk by 88 percent since 1920 due to human overuse, while Lake Khyargas in Mongolia has declined primarily due to temperature-fueled evaporation. Conversely, Lake Sevan in Armenia shows that enforcing withdrawal limits can increase storage in overused basins.
• Global mean lake evaporation rates are projected to increase by 16 percent by 2100. Innovative infrastructure can mitigate this, such as a floating photovoltaic array at the Passaúna reservoir in Brazil, which reduced evaporation by 60 percent.

APA

Petach, T. (2024). How Cities Run Dry: Drivers of Water Shortages and Policy Implications. Energy Innovation. https://energyinnovation.org/expert-voice/how-cities-run-dry-drivers-of-water-shortages-and-policy-implications/

Chicago

Petach, Tanya. How Cities Run Dry: Drivers of Water Shortages and Policy Implications. Energy Innovation, 2024. https://energyinnovation.org/expert-voice/how-cities-run-dry-drivers-of-water-shortages-and-policy-implications/.

Wikipedia

{{cite report |last1=Petach |first1=Tanya |title=How Cities Run Dry: Drivers of Water Shortages and Policy Implications |publisher=Energy Innovation |date=30 July 2024 |url=https://energyinnovation.org/expert-voice/how-cities-run-dry-drivers-of-water-shortages-and-policy-implications/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{petach2024how, author = {Petach, Tanya}, title = {{How Cities Run Dry: Drivers of Water Shortages and Policy Implications}}, institution = {Energy Innovation}, year = {2024}, month = jul, url = {https://energyinnovation.org/expert-voice/how-cities-run-dry-drivers-of-water-shortages-and-policy-implications/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }