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<idAbs>Par inondation, on entend le débordement d'un cours d'eau hors de son lit. Le caractère plus ou moins dangereux des inondations dépend de la hauteur d'eau et de la force du courant atteinte, ainsi que de la quantité de matériaux charriés.&lt;br /&gt;&lt;br /&gt;La détermination des zones d'inondation se fait par rapport à la topographie. Pour certaines zones, l'apparition d'inondations dépend de conditions particulières concomitantes au déroulement de l'évènement de crue, comme: les embâcles sous les ponts et passerelles, la rupture d'un ouvrage de protection ou les courbes de remous aux points de confluence des cours d'eau ou du lac.&lt;br /&gt;&lt;br /&gt;Les périodes de retour pour lesquelles les zones d'inondation ont été déterminées sont de 30, 100 et 300 ans et pour certains cours d'eau 2 et 10 ans. Les zones d'inondation conditionnelle sont représentatives des conditions particulières décrites ci-dessus.</idAbs>
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<keyword>Eaux intérieures</keyword>
<keyword>Sciences de la terre</keyword>
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<idPurp>Inondation - Temps de retour 10 ans</idPurp>
<idCredit>© 2026 SITG</idCredit>
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