It is of great significance to reasonably discriminate the first flush effect of rainfall runoff, scientifically evaluate the flushing strength, and explore the factors influencing the first flush effect. In the present study, the corrected five-level classification criteria of MFF30 (the ratio of cumulative pollution load ratio to cumulative runoff ratio when the top 30% of surface runoff occurs) were developed. Overland flow processes and runoff water quality were measured within the seven different subcatchments during the seven rainfall events in Beijing, and the factors that influenced the TSS, COD, and TN flushing strengths were analyzed. The results showed that the first flush effects could be explicitly quantified and compared by using the corrected MFF30 method. If other precipitation or underlying surface conditions were similar, antecedent dry days, dynamic variation in rainfall intensity, surface slope and width of the subcatchment, and traffic flow greatly made the impact on the first flush effect.
LI Qi
,
ZHANG Na
,
LUO Yingjie
,
WANG Xin
,
JING Yongcai
. The first flush effect of urban rainfall runoff based on MFF30 method[J]. Journal of University of Chinese Academy of Sciences, 2019
, 36(5)
: 650
-662
.
DOI: 10.7523/j.issn.2095-6134.2019.05.011
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