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Avaliação da Disponibilidade Hídrica e da Demanda Hídrica no Trecho do Rio Piranhas-Açu entre os Açudes Coremas-Mãe D’água e Armando Ribeiro Gonçalves

2011; Brazilian Association of Water Resources; Volume: 16; Issue: 4 Linguagem: Inglês

10.21168/rbrh.v16n4.p7-19

2318-0331

EULINA MOURA, Antônio Marozzi Righetto, RANIERE LIMA,

Hydrology and Watershed Management Studies

Piranhas-Acu River Basin is a federal basin located in the semiarid region of the Brazilian Northeast. Sixty per cent of its area is in the State of Paraiba, and 40% in Rio Grande do Norte. The main river, the Piranhas-Acu, is a vital source for many socio-economic activities carried out along its course. The reach under study has several pipeline systems, irrigation projects, and supplies several towns along the rivers. All these activities require a large volume of water as compared to the scarcity of water in the semiarid region. Considering the importance of this water resource for the region and the need to implement appropriate management, this paper aims to survey the actual conditions of water supply in this part of the Piranhas-Acu by hydrologic modeling which include the provision of major dam contribution basins of the river, and their monthly water balance. The rainfall-runoff model applied to the sub-basins was the MODHISA-hydrological model for the Semi-Arid. The simulation of the transformation of mean precipitation that occurred in the sub-basin in inflows to the Piranhas-Acu generated 50 years of synthetic flow data at relevant points of the Piranhas-Acu river and its tributaries enabling the construction of duration curves for flows along the reach studied. When we compare the available flows to the current and future demands for raw water intakes from the stretch, we observe that service is fully assured. It was also concluded that the MODHISA was very appropriate to the hydrological characteristics of the sub-basins of Piranhas- Acu catchment