Publications and Research
Document Type
Report
Publication Date
6-17-2026
Abstract
This report examines how ecosystem structure, hydrology, and material flows in Williamsburg, Brooklyn have changed from pre-colonial conditions to the present and how they are expected to evolve under future climate change. Prior to European colonization, the landscape functioned as a forest–wetland mosaic with high infiltration capacity, slow water movement, and strong nutrient retention. These conditions supported stable aquatic ecosystems and minimized pollutant transport to the East River.
Modern urbanization has fundamentally altered this system. Impervious surfaces and engineered drainage systems have shifted hydrology from infiltration-dominated to runoff-dominated pathways, producing rapid “flashy” flows and reducing water residence time.
Storm events now generate large pulses of nutrients, sediments, and contaminants, primarily through combined sewer overflows (CSOs), degrading water quality and ecosystem stability. Future climate projections indicate that these challenges will intensify. Increased precipitation, sea-level rise, and higher temperatures will amplify runoff volumes, increase CSO frequency, and exacerbate hypoxia, nutrient loading, and ecological stress in the East River.
Overall, this analysis demonstrates that the transition from a buffered natural system to a highly connected urban system has transformed storm events from stabilizing processes into drivers of environmental degradation, a trend that is expected to worsen under climate change.
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