Dimensionamento de cisternas tipo calçadão associado à variabilidade pluviométrica: estudo de caso no município de Delmiro Gouveia - AL

Abstract

Everybody know northeast region of Brazil suffers long periods of droughts caused by fewer climatic events, so it´s important to search for alternative to store rainfall to be used in droughts. Thus, the cistern type boardwalk stands out as option to collection of rain water from floor of concrete to use in dry periods. However, for complete assistance on the demand, the area of floor going to depend of the rainfall´s local regime, although the precipitation is a component totally aleatory, therefore it´s necessary studies of probability for understanding of behavior precipitations. So, a new mechanism of sizing of the cistern type boardwalk was introduced, associated to the level of frequency of a determined value of precipitation (or risk) and from alteration of a model proposed by ABNT (Association Brazilian of Rules and Techniques). Then, hydrologic information from the town of Delmiro Gouveia - AL were collected for the construction curve of frequency precipitations, and a hypothetic situation was created for the determination of the demand and estimative cost of cistern for different values of area of concrete floor, namely risk. The results show that it's possible spend small values incremental so that decreases significantly decreases the risk of no assistance on the necessary demand.