RT Report T1 Water Management of the Amazon Basin K1 water management K1 river basin K1 forest K1 water resources development K1 water quality management K1 climate change SN 92-9089-017-7 YR 1991 FD 1991 LK https://wedocs.unep.org/handle/20.500.11822/30384 UL https://wedocs.unep.org/handle/20.500.11822/30384 NO This paper analyzes annual maximum precipitation series for the Xingu and Tapajos basins located both in the Amazon basin. The analysis has the objective of indicating a probability distribution function that can be used in design flood calculations for spillways of large dams in the region. Due to the short length of the records in the region and the robustness of the estimates of population descriptors (ex: variation and skewness coefficients) based on probability weighted moments, this approach is adopted as the main methodology. DS UN Environment Document Repository RD Sep 24, 2026