Variação temporal da capacidade de uso da água em açudes públicos de Nossa Senhora da Glória-SE

Abstract

In order to evaluate the temporal variation of physical-chemical and microbiological parameters of water and to identify the potential use of public ponds at Nossa Senhora da Glória-SE. For it, it were collected samples at the ponds “Algodoeiro”, “Angico”, “DNOCS”, “Feirinha” and “Fortaleza” in four periods of the year, each four months, the first being between May and August 2018; the second from August to November 2018, the third from November to February 2019 and the fourth from February to May 2019. In this periods, weather data were obtained from INMET's automatic agrometeorological station. After the collections, the water samples were analyzed for physical-chemical and microbiological variables, from which it was possible to perform the multivariate structuring through Principal Component Analysis (PCA), in order to form groups of periods and variables , in addition to classifying the waters, based on toxicity, salinity, sodicity and the risk of irrigation clogging. The physical-chemical quality of the ponds water is not linked only to the climatic characteristics, but also to the particularities of use of each reservoir; The “Feirinha” pond is the one with the best condition of use, with low risk for salinization, sodification and non-toxic levels of sodium, chlorides and bicarbonates, being ideal for irrigation, without presenting risks of clogging irrigation emitters; The waters available in the “Algodoeiro”, “Angico” and “Fortaleza” ponds, during the evaluated period, are classified as unsuitable for irrigation due to the high risk of salinization, toxic chloride content and risk of clogging irrigation emitters.