From Urban Planning to Precipitation: How Municipal Management Influences Drought in Tehran and Denver

Core Problem:Drought has become an increasingly urban problem, influenced not only by climate variability but also by municipal planning and management decisions. In many cities, limited coordination between land-use policies, water infrastructure, and governance structures intensifies drought vulnerability. This study addresses how municipal management contributes to drought conditions in two semi-arid cities—Tehran and Denver—and why understanding this relationship is vital for sustainable urban water resilience.Approach:A comparative analysis was conducted using satellite-derived land-cover data, municipal water-use statistics, and policy documents from 2000 to 2025. Spatial indicators such as impervious surface ratio and vegetation index (NDVI) were correlated with standardized drought indices (SPI, SPEI). The study also reviewed local zoning laws, water pricing systems, and conservation programs to assess how governance frameworks mediate hydrological stress.Key Findings:Results show that Tehran’s rapid urban expansion, limited green infrastructure, and fragmented water governance have intensified drought exposure and reduced adaptive capacity. In contrast, Denver’s integrated urban planning, tiered water pricing, and wastewater reuse policies have effectively mitigated drought impacts and stabilized municipal water demand.Impact:The study demonstrates that drought resilience is strongly shaped by local governance rather than climate alone. Strengthening municipal coordination, enforcing land-use controls, and investing in water-sensitive infrastructure can significantly reduce drought risks. These findings provide actionable insights for policymakers seeking urban adaptation strategies under escalating climate pressures.