Summary — Frequency of runoff in the cropped area of the French basin of Lac Léman. Agricultural runoff from the Chablais region of France, is believed to contribute to the pollution of the waters of Lac Leman (Lake Geneva). This study aimed at determining which factors influence the frequency of runoff from agricultural lands. Two hundred agricultural fields under a wide diversity of agricultural practices were monitored during a winter and a summer period. For each field the kinetics of formation of superficial soil crusting that can prevent infiltration of rainfall into deeper soil layers was evaluated and the presence of runoff was observed. Additionally, the farmers were surveyed to determine the specific agricultural practices that were used on each field. The

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