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Flood - Return time 100 years

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This dataset defines flood zones in the Canton of Geneva, Switzerland, corresponding to a 100-year return period, meaning an event with roughly a 1% probability of occurring in any given year. Flooding occurs when a watercourse overflows its bed, and its severity depends on water depth, current strength, and the volume of material carried. Flood zones are delineated in relation to local topography. The data is published by the Système d'information du territoire genevois (SITG), the geographic information system for the Canton of Geneva, and supports land-use planning, risk assessment, and civil protection efforts related to watercourse flooding at the local level.”}(Note: erroneous trailing quote character removed in final) Correcting: {Flooding is the overflow of a watercourse out of its bed. The more or less dangerous nature of flooding depends on the height of water and the strength of the current reached, as well as the amount of material carried. The determination of flood zones is done in relation to the topography. For some…