Prognóstico da demanda hídrica do açude Barra do Juá e Riacho do Navio, em Floresta - PE, frente à transposição do Rio São Francisco

Abstract

The Barra do Juá dam is a reservoir located in the municipality of Floresta, in Pernambuco, and runs the course of the Riacho do Navio, both of which are located in the Pajeú river basin. The dam and stream are inserted indirectly in the Transposition Project of the São Francisco river, and are eventually supplied by the Muquém reservoir, part of the Eixo Leste canal. The two sources of this study have importance for the development of the territory in its amount and downstream, being vital for the population and economic activities. Considering the relevance of the reservoir, this work aims at estimating water demand for human consumption, animal watering and agriculture in order to advise users in the search for a guarantee of supply of the transposed waters of the São Francisco River and to better manage the resources available. Data were collected from the Brazilian Institute of Geography and Statistics (IBGE), the Municipality of Floresta (PMF) and the National Institute of Meteorology (INMET) for the projection of growth (arithmetic, geometric, decreasing growth rate and logistic curve) and estimates of evapotranspiration for the most cultivated crops in the region to calculate the required water volume in 2019 (currently), 2029 (short term horizon), 2039 (medium term horizon) and 2049 (long horizon term). The results showed that the sector that consumes the most water is agriculture, with an average of 95.21%, followed by 3.00% for animal consumption and 1.79% for human consumption. It is concluded that the necessary regulation to guarantee water supply will bring benefits to the region, facilitating the return of the population to the rural area, the consolidation of agriculture in the region and constant irrigation throughout the water.