Lori C. Emler and Thomas Meixner
The water quality of urban runoff is uniquely significant to arid and semi-arid regions, such as southern Arizona, which count urban runoff among the limited renewable resources for a continued water supply. Despite the essential nature of this resource, the hydrochemical evolution of urban runoff over the course of a storm and a rainy season overall is less well understood than is ideal for researchers and resource managers alike. In particular, nitrogen species contribute to many of the highest priority water quality concerns for water managers. This research project addresses the evolution of nitrogen over the course of individual storm events that occurred during the winter rainy season and the summer monsoon season in two urban catchments in the semi-arid city of Tucson, Arizona. This poster discusses analytical methods and presents preliminary data for a subset of sampled storms and the associated hydrochemical results.