Dimensionamento de cisternas e proposta de tipologias de volume para regiões pluviais homogêneas

Abstract

The adoption of catchment systems of rainwater as source of drinking water is a disseminated practice in many parts of the world. The system efficiency is directly connected to the suitable sizing of the reservoir. The aim of this research is delimit homogeneous pluvial zones to the Rio Grande do Norte State, to assess the variation of volumes of the cistern for regions with similar rain regimes. For delimitation of the homogeneous pluvial zones was used the mean annual precipitation and the PCD (Precipitation Concentration Degree) that allows to estimate the way as the precipitation distributed over the months of the year. The results show that the division in 6 homogeneous groups contemplates all the variation of rainfall characteristics for the. The methods evaluation of the sizing, it cans conclude that the methods Andrade Neto, Rippl Simulação, YAS, Prático Australiano and Efficiency of the 80% are appropriate, whereas the methods presents variation of the volumes consistent with variation in rainfall characteristics. Lastly, it is possible establish typologies of cistern volumes that can meet the diverse situations that exist in practice. In the case of the State of Rio Grande do Norte, we can used six volumes of different cisterns: 3, 5, 8, 12, 16 e 18 m³. Only 7% of available families need of a cistern of 16 m³ for attend satisfactorily their demands, this show that the volume used for all the situations is the adequate volume for a small portion of families, proving the need to use different volumes.