Trend Detection in Annual Streamflow Extremes in Brazil

Changes in streamflow extremes can affect the economy and are likely to impact most vulnerable society. Estimating these changes is crucial develop rational adaptation strategies protect Streamflow data from 1106 gauges were used provide a comprehensive analysis of change eight different extreme indices. The modified trend-free prewhitening false discovery rate account for serial correlation multiplicity regional analysis, issues shown here distort results if not properly addressed. estimated proportion with significant trends low high flows was about 23% 15%, respectively. Half had more than 60 years associated greater 5% per decade. A clear spatial pattern identified, where increasing both observed Southern Brazil, decreasing remaining regions, except Amazon, clear, low. Results based only on unaffected by reservoirs suggest that alone do explain southern regions nor hydrographic regions.