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A Bacia Hidrografica do Riacho do Pontal esta localizada na regiao semiarida do Estado de Pernambuco, proxima a importantes polos de fruticultura irrigada como o de Petrolina-Juazeiro, porem, pela baixa disponibilidade hidrica a agricultura irrigada apresenta grandes limitacoes. Por essa razao, levar-se em consideracao apenas a problematica da disponibilidade hidrica da Bacia sem que haja estudos relevantes em relacao as mudancas climaticas, pode vir a ocasionar uma serie de dificuldades em relacao a oferta de agua. Dessa forma, utilizou-se uma metodologia empregada em paises como Estados Unidos e Australia para o diagnostico do estresse hidrologico, que estima atraves de metodos estatisticos, a vulnerabilidade das mudancas climaticas da Bacia e a demanda da populacao pelos recursos hidricos. A metodologia leva em consideracao a dinâmica natural da Bacia com base na serie historica das vazoes naturais de 1935 a 1985, portanto antes das modificacoes acarretadas pela acao antropica tais como: obras de regularizacao de vazoes realizadas por reservatorios, desvios de agua, evaporacoes em reservatorios, usos consuntivos, etc. A partir dos resultados obtidos constatou-se que a Bacia apresenta uma alta variabilidade climatica, alta nao-estacionariedade da serie hidrologica analisada, alta vulnerabilidade as mudancas climaticas, alta razao de uso dos recursos hidricos e alto estresse hidrologico, indicando com isso que os sistemas de abastecimento de agua da regiao atuam no limite da capacidade, sendo sujeita a variacoes nos padroes climaticos, bem como indica a impossibilidade da Bacia ofertar agua suficiente para atender as demandas, de forma que a sua integracao com a Bacia Hidrografica do Rio Sao Francisco e a alternativa mais viavel para a realidade da regiao. Palavras-chave: mudancas climaticas, disponibilidade hidrica, fruticultura irrigada, integracao de Bacias hidrograficas. Abstract The river basin Pontal is localized in the semiarid region of Pernambuco, near to big centers of irrigated fruit growing as the Petrolina-Juazeiro, however, through the low availability of water the irrigated agriculture presents major limitations. For this reason, lead into consideration only the problematic of hydric availability the basin without there is relevant studies on climate changes, can occasion a lot of difficulties in relation to water offer. Thus, was used a methodology housekeeper in countries like the United States and Australia for the diagnosis of the hydrologic stress, what estimate through statistical methods, the vulnerability of climate changes the basin and the demand of the population by hydric resources. The methodology takes into consideration the natural dynamics of the basin based on historical series of natural flow rates from 1935 to 1985, therefore before the modifications brought about by human activities such as: regularization of stream flow realized by reservoirs, water diversions, evaporation in reservoirs, consultive uses, among others. From the results obtained it was found that the basin presents a high climatic variability, high nonstationarity the hydrologic series analyzed, high vulnerability to climate change, high reason of use of the water resources and high hydrologic stress, indicating with it, that the systems the supply of water in the region, operate in the capacity threshold is subject to variations in weather patterns, as well as indicates the impossibility of basin offer enough water to answer the demands, so that their integration with the watershed of the Sao Francisco River is the most viable alternative to the reality of the region. Keywords : climate change, water availability, irrigated fruit, watersheds integration.

Estimativa do Estresse Hidrológico na Bacia Hidrográfica do Riacho do Pontal-PE / Hydrological stress estimate in Pontal watershed-PE