Monitoring and studying rainfall runoff pollution from urban impervious surfaces

Abstract

<p>Urban impervious surface rainfall runoff pollution is a significant component of non-point source pollution, with pollutants accumulating on these surfaces during dry periods being the primary source of contaminants in rainfall runoff. Using the first ten rainfall events of 2015 as a case study, impervious surfaces such as the roofs of teaching buildings, campus roads, and nearby main traffic roads within the university campus in southeastern Beijing were selected for field sampling and analysis of natural rainfall and rainfall runoff pollution. The findings indicate that the initial rainfall runoff pollution following winter is severe, with water quality falling below Class V. Subsequently, the pollution levels decrease; however, the severity of water pollution varies at different sampling locations. Notably, ammonia nitrogen concentrations are higher near building toilet exhaust outlets, and the presence of pervious surface facilities can mitigate runoff pollution. Based on the analysis and research findings, several recommendations for controlling and managing urban rainfall runoff pollution are proposed.</p>