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Characterization of first flush behaviour is important for urban stormwater management design. While mass-based definitions for first flush are common, current first flush definitions were developed considering tropical and temperate climates rather than continental climates. This study aims to investigate first flush behaviour in two urban and mixed land use subcatchments in London, Ontario, Canada, which is located in a continental climate. Data was analysed using four first flush definitions. The results revealed first flush was moderate for total suspended solids (TSS), total phosphorus (TP), and soluble reactive phosphorus (SRP). As expected, particulate pollutants (TSS) showed a stronger first flush as compared to mixed (TP) and dissolved pollutants (SRP). No significant correlation was found between the strength of the first flush definition and rainfall characteristics likely due to first flush occurring only during the initial runoff period. None of the monitored events satisfied FF30 criteria, suggesting this definition may be unsuitable for continental climates. Significant differences in first flush strength between definitions suggest further research is needed to identify suitable definitions for continental climates.

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First Flush Stormwater Phenomena for Cold Climate Urban Subcatchments in London, Ontario

  • 会议论文

  • 发表日期：

    2025年

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  • Shagun Chaudhary,
  • Pradeep Goel,
  • Dillon Vyn,
  • Sabrina Jivani,
  • Imtiaz Shah,
  • Clare E. Robinson

摘要

Characterization of first flush behaviour is important for urban stormwater management design. While mass-based definitions for first flush are common, current first flush definitions were developed considering tropical and temperate climates rather than continental climates. This study aims to investigate first flush behaviour in two urban and mixed land use subcatchments in London, Ontario, Canada, which is located in a continental climate. Data was analysed using four first flush definitions. The results revealed first flush was moderate for total suspended solids (TSS), total phosphorus (TP), and soluble reactive phosphorus (SRP). As expected, particulate pollutants (TSS) showed a stronger first flush as compared to mixed (TP) and dissolved pollutants (SRP). No significant correlation was found between the strength of the first flush definition and rainfall characteristics likely due to first flush occurring only during the initial runoff period. None of the monitored events satisfied FF30 criteria, suggesting this definition may be unsuitable for continental climates. Significant differences in first flush strength between definitions suggest further research is needed to identify suitable definitions for continental climates.