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Nos ultimos anos a bacia do rio Una, localizada no estado de Pernambuco, vem sendo palco de desastres causados por cheias. Nos anos de 2000, 2005 e, mais recentemente, em 2010 e 2011, varias cidades da Mata Sul registraram chuvas que foram considerados os maiores da historia, podendo ser uma das consequencias das mudancas climaticas, que acaba aumentando a intensidade e o numero desses eventos extremos. O objetivo deste trabalho e avaliar a tendencia dos indices de deteccao de mudancas climaticas dependentes da precipitacao pluvial, definidos pela Organizacao Meteorologica Mundial (OMM). Foram utilizados dados diarios de 14 postos pluviometricos da antiga rede de estacoes pluviometricas da SUDENE, da APAC e do ITEP, os quais apresentaram informacoes com qualidade confiavel de precipitacao pluvial com series historicas de aproximadamente 43 a 49 anos consecutivos, contados de 1963 ate 2006 para uns municipios da bacia, e de 1963 ate 2012 para outros. Utilizou-se o software RCLIMDEX (versao 2. 13.1) para calcular os indices climaticos e as possiveis tendencias climaticas. Diagnosticaram-se tendencias negativas do indice PRCPTOT e positiva do indice DCU. Na bacia do Una, destaca-se a localidade de Barreiros, localizada no setor leste, que apresentou tendencias positivas dos indices R50mm, Rx1day e Rx5day, evidenciado aumento das chuvas intensas (acima de 50 mm) em 24 horas e em cinco dias consecutivos, indicando que o setor leste da bacia do Una esta sujeita a eventos com chuvas extremas e consequentemente a periodos de enchentes pela ocupacao irregular e pelo mau uso do solo. A B S T R A C T In recent years the Una river basin , located in the state of Pernambuco, has suffered disasters caused by floods . In the years 2000 , 2005 and most recently in 2010 and 2011 , several cities in South Woods recorded rains that were considered the largest in history , being one of the possible consequences of climate change or just variability of the local climate , which end increasing number and intensity of these extreme events . The objective of this study is to evaluate the trend in the rates of detection of climate -dependent changes of rainfall , defined by the World Meteorological Organization ( WMO ) . We used daily data from 14 rainfall stations in the ancient network of rainfall stations SUDENE , APAC and ITEP , which presented information with reliable quality rainfall with historical series of approximately 43 to 49 consecutive years , from 1963 until 2006 used to few municipalities in the basin, and from 1963 to 2012 for others. By using RClimdex software was used to calculate the indices and their climatic trends. Negative trends PRCPTOT positive index and index DCU were diagnosed. In the Una basin, there is the town of Barreiros, located in the eastern sector, which saw positive trends R50mm, Rx1day and Rx5day indexes, evidenced increased intense rainfall (over 50 mm ) in 24 hours on five consecutive days, indicating that the eastern sector of the Una basin is subject to more extreme rainfall events and hence the periods of flooding by the illegal occupation and the misuse of land. Keywords: Precipitation, watershed, disasters, floods

Tendências de Mudanças Climáticas na Bacia do Rio Una, Pernambuco – Brasil (Trends of Climate Change on the Una River Basin, Pernambuco – Brazil)