Dear Colleagues,

Human populations are increasingly concentrated in urban areas, and by 2050, 70% of the world's population will live in cities (UN-Habitat). As the urban population grows, increases in impervious surfaces, combined-flow sewers, and non-point source contaminants put water resources at risk. These include changes in the discharge of potential carcinogens, elevated organic/inorganic nutrients, and weathering products from roads and buildings. Urban surface waters present unique challenges to mitigation efforts. Both rivers and small urban lakes are likely to suffer similar non-point source contamination. Faced with these challenges, municipalities have increasingly become interested in reclaiming waterways by introducing "green" technologies or adaptations aimed at improving water quality. Identifying the sources, effects, and solutions to the complex issues facing urban surface waters requires a cadre of scientists, managers, and community activists to conceive and implement solutions.

In this Special Issue, we welcome submissions focusing on both the changing water quality and biogeochemistry of urban surface waters, as well as efforts to reduce adverse impacts on these systems.

We would encourage submissions from presenters at AGU (December 2020) as well others with related research.

Prof. Stephen Macko
Prof. Stephen MacAvoy
Guest Editors

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