DETERMINATION OF THE REGIONALIZED EQUATION OF HEAVY RAINFALL FOR THE COPPER HYDROGRAPHIC BASIN IN SALVADOR-BA

Abstract

Knowledge about heavy rainfall based on intensity, duration and frequency pressures is an important tool in urban planning and dimensioning of hydraulic projects. The Rio do Cobre hydrographic basin in Salvador-BA has an area of 20.65 km2, being the fifth largest basin in the municipality. The region has a population density of 4,319.56 inhabitants/km², with the aggravating factor being one of the areas of greatest poverty in the capital of Bahia, often suffering from flooding and flooding. In this sense, this work aimed to determine the maximum rainfall associated with different return periods using probabilistic methods and to obtain the parameters of regionalized protection from intense rainfall for the Rio do Cobre watershed in Salvador. For that, a historical series of 75 years was used, which was adjusted by the distribution of extremes, or Gumbel distribution, to obtain the maximum precipitation. The results of the migration parameters for the IDF were K= 360.1246, m=0.1992 and n=-0.61926, with a captain of instruction r²=0.975.