First flush
Initial surface runoff of a rainstorm / From Wikipedia, the free encyclopedia
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For first flush tea, see Tea § Cultivation and harvesting.
First flush is the initial surface runoff of a rainstorm. During this phase, water pollution entering storm drains in areas with high proportions of impervious surfaces is typically more concentrated compared to the remainder of the storm. Consequently, these high concentrations of urban runoff result in high levels of pollutants discharged from storm sewers to surface waters.[1][2]: 216