The floods constitute the most important disaster among the natural hazards. Floods represent about 30% of the total number of natural disasters and economic damages, and almost 25% of the fatalities produced by the natural disasters (Fig. 4). The extensive and enhanced statistical data show that, in the period 1975–2001, some 95 significant floods per year have been produced, which have caused a mean of some 11,000 fatalities per year, and have affected some 150 M people per year, which signifies that in the last decade of the twentieth century, 25% of the world population has been affected by the floods (6).
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