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In rain runoff, the levels of seven pollutants (CODMn, TN, DTN, NH3-N, TP, DTP, and PO43-) increased during the initial rainfall duration and decreased within the later period. Rainfall causes the erosion of pollutants from the fundamental surface so that water pollution starts whenever rain runoff takes place, and the pollution degree drops as time passes. The seven toxins all experience this first flush effect, of which, rain has the strongest sc