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The analysis of time distribution of rainfall in heavy storms

ABSTRACT:

The research objective was to analyze the time distribution of rainfall caused by flash floods in Gregorio watershed (São Carlos, São Paulo, Brazil). Two methodologies of temporal distribution of rainfall were applied for adopted return periods of 25, 50 and 100 years: the Huff 1st quartile method and the alternating blocks method; wherein the flood inundation areas were simulated with HEC-GeoRAS software. The time distribution of both rainfall methods exhibit 46% discrepancy in peak flow, 57% in flood inundation area and 1.5 m in water depth.

Keywords:
flood inundation area; time distribution of rainfall; hydrological simulation

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