Characterization of Stormwater Runoff from a Light Rail Transit Area

Area of Science:

• Environmental science
• Water quality monitoring
• Transportation engineering

Background:

• Stormwater runoff from Light Rail Transit (LRT) facilities is inadequately monitored globally.
• Understanding LRT runoff characteristics is crucial for effective environmental management.

Purpose of the Study:

• To assess the quality and quantity of stormwater runoff from LRT facilities during operational and non-operational phases.
• To investigate the relationship between antecedent dry days and pollutant concentrations in LRT runoff.
• To compare LRT runoff pollution levels with other transportation land uses.

Main Methods:

• Monitoring of runoff quality and quantity from LRT facilities between 2010 and 2013.
• Statistical analysis of event mean concentration (EMC) of pollutants.
• Correlation analysis between antecedent dry days (ADD) and pollutant EMCs.
• Comparative analysis with data from an adjacent road bridge site.

Main Results:

• Pollutant EMCs exhibited minimal statistical variability between operational and non-operational LRT phases.
• A moderate to strong positive correlation was observed between ADD and pollutant EMCs during the non-operational phase.
• The first flush phenomenon in LRT runoff was comparable to other transportation land uses.
• Pollutant EMC and unit load from a road bridge site were 2 to 9 times higher than from LRT facilities.

Conclusions:

• Light Rail Transit (LRT) facilities demonstrate potential for non-point source pollution management due to consistent runoff quality.
• Automated operation and elevated track designs of LRT systems may contribute to reduced environmental impact.
• LRT runoff characteristics, influenced by antecedent conditions, offer insights for targeted stormwater management strategies.