Dimensionamento de reservatório para aproveitamento de águas pluviais em edificações uma análise comparativa utilizando dados de pluviômetro e TRMM

Abstract

The use of rainwater for non-potable purposes has become increasingly common in regions with scarce water availability. This water is stored in reservoirs, the volume of which is designed to avoid unnecessary expenditure. One of the key variables in calculating the volume of reservoirs is the region’s rainfall data, which is not always available in good quality due to the limitations of traditional data collection methods. Satellites have emerged as an alternative for collecting rainfall data, as they cover a large area and operate continuously over time. In this context, this study aims to analyze the design behavior of rainwater reservoirs in buildings using data from the Tropical Rainfall Measuring Mission (TRMM) satellite and rain gauge data from 1998 to 2018. In particular, the aim is to collect and analyze rainfall data between 1998 and 2018, compare the volumes of the designed reservoirs and analyze which variables have the greatest impact on reservoir sizes. To do this, information was used, such as consumption and catchment area, from three buildings in the city of Delmiro Goueia - AL, as well as rain gauge data collected on the HidroWeb platform and TRMM data, specifically product 3B42-V7. This information was used in the Simulation Method to calculate the volume of the reservoirs. It was found that satellite data tends to underestimate the total rainfall for the period analyzed. In addition, the TRMM has a tendency to overestimate rainfall data in rainy periods and underestimate it in dry periods. As a result, it is not possible to design the reservoirs satisfactorily with the satellite data, as they require twice the volume when compared to reservoirs designed using rain gauge data. In addition, daily consumption and total rainfall are the variables that have the greatest impact on the final design volume.