Abstract
The semiarid region of Northeast Brazil experienced during the years 2012 to 2020 one of its worst periods of severe drought. This was largely due to the conditions of the El Niño phenomenon in the Pacific Ocean and the oceanographic and atmospheric conditions of the Atlantic Ocean. In this article, it was intended to address the aspects of water management due to this extreme drought, both from the supply and demand side, in a typical hydrographic basin in the Brazilian semiarid, the Piancó-Piranhas-Açu river basin. With the reduction of rainfall and the consequent tax flow to the main reservoirs in the region, the operation of the reservoirs responsible for the main uses of the region's water resources is shown to be of fundamental importance: irrigated agriculture (with an estimated area of around 50 hectares in the basin); aquaculture; human and industrial supply, among others. Actions aimed at the rational use of water, monitoring and negotiated water allocation mechanisms, as well as communication were also carried out.
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