ANALYSIS OF PLUVIOMETRIC DATA FOR THE PREVENTION OF RISKS OF INSTABILITY OF SLOPES IN THE MUNICIPALITY OF NITERÓI

Abstract

This research aims to analyze the rainfall data from the network of rain gauges installed in the city of Niterói in order to guide the Civil Defense and the population in actions to reduce the risk of landslides on slopes. The study was based on data from rain gauges in Niterói and information obtained from the Municipal Plan for Reducing Flood Risks and Slope Instability developed by a team of researchers from UFF. Rainfall records from 2014 to 2019 were studied. It was found that during that period there was no intensity higher than that observed in 2010, when the disaster of Morro do Bumba. Most of the maximum rainfall measured in the period were below 41 mm in the 24-hour period, a limit considered critical for the city of Niterói. The return time calculated for the largest registered ones presented values ​​inferior to eight years, indicating the non-occurrence of extreme events in the analyzed period. The locations of the sixteen rain gauges are adequate to cover the entire municipality, constituting an important resource for assisting Civil Defense agencies and the population in actions to reduce the risks of instability on slopes.