“…Significant variability in sediment‐associated contaminant transport during flood events has been reported in a range of catchment types (e.g., Coynel, Schäfer, Blanc, & Bossy, ; Leenaers, ; Resongles, Casiot, Freydier, Le Gall, & Elbaz‐Poulichet, ; Zonta, Collavini, Zaggia, & Zuliani, ). This includes varying concentrations across the flood hydrograph, where elevated concentrations are often dependent on discharge (Bradley & Lewin, ; Zonta et al, ), and contaminants may exhibit a “ first flush ” response (Lee, Bang, Ketchum, Choe, & Yu, ; Yin & Li, ).…”