Influência do regime pluviométrico e da temperatura atmosférica no coeficiente de escoamento superficia em telhado cerâmico

Abstract

This work aimed to analyze the influence of the pluviometric regime and atmospheric temperature on the runoff coefficient (C) on a non-glazed ceramic tile roof, in Chapecó city. The experiment was carried out by assembling a small-scale roof with its respective capture and storage systems. Data monitoring was performed with two types of pluviometer and an atmospheric temperature sensor. The measured coefficients showed a high dispersion of values, being its median and mean, 0.57 and 0.58, respectively. The mean C is 20% lower than the values recommended in the literature and generally adopted in projects, which may result in over-dimensioning of the rainwater capture and storage systems of rainwater harvesting. Three of the nine independent variables analyzed showed a moderate positive correlation with C coefficient, pluviometric height, duration of the longest event and thermal amplitude. This relationship is possibly explained by porosity the tile, absorption, evaporation and atmospheric humidity. It is suggested the adoption of C values between a confidence interval of 0.51 to 0.66 for similar climates of the city where the experiment was installed. Since the adoption of the C value is a very important part of a capture and storage project of rainwater harvesting, this work can contribute to promote design environmental and financial sustainability.