Possibility of operative decision-making is considered about the scales of possible leash flood at the known values of factors influence on floods and expected vectors priorities of factors influence and scales of flood. The vectors priorities are determined with the use of unclear description of factors influence on the scales of flood. The method of operative decision-making about the scales of flood is offered. The results operative determination character of floods are resulted at four different sets of values factors influence on floods.
flood flood, scale of flood, decision-making, factor of influence