Condições operacionais de estruturas hídricas destinadas ao armazenamento de água no Vale do Rio Pajeú

Abstract

One of the problems related to water resources in Brazil, beyond the unconscious use of the water and overused by population, it’s your irregular geographical distribuition, so that only 3% of these resources are located in the Norteast, region that owns 27,3% of the population of the country and is characterized by high annual evaporations and low precipitation rates, which are even smaller in the Semiaridregion.In this context, one of the most important rivers of the state of Pernambuco and that constitutes the greater hydrographic basin is the Pajeú, which is born in the city of Brejinho -PE and flowsinto the Itaparica dam, with a river mouth located between the cities of Floresta and Itacuruba. Because it’s an intermittent river, one of the main initiatives of the public power to increase the water supply over time has been and continues to be the construction of large hydraulic works such as dams, whose purpose it’s to store water for supplying the cities and for the cultivation of land and animal breeding. Along the Pajeú River there are 30 reservoirs with a capacity of more than 1 million m³ of water, and the Serrinha dam has the highest storage potential with 311 million m³. Due to the lack of information on the current state of these water structures, the present work proposed to raise, between august and december of the 2018, the state of conservation and the operating dynamics of sixof the main water bodies of the Pajeú River and its tributaries.Therefore were done surveys in locoof the structural and operational aspectsof this dams, as well as approaches were taken with the managers of eachone.It was found that most of the structures shows a worrying derelictionscenario, with Brotas and Jazigo dams being the most serious cases and Saco I, which has the best condition among all of them, however all can be classified as high associated potential harm and high category therefore, prone to disruption if they remain without the short-term contemplation of a preventive management and maintenance plan.