Observations for
Maximum Precipitation for a Return Period of years mm



This map shows the maximum precipitation amounts for multiple return periods for Brasil using a Regional Frequency Analysis using L-moments (RFA-LM).

The RFA-LM (Nunez et al., 2010) determines the frequency of drought events by pooling stations in climatologically homogeneous regions. This allows application of more robust statistics, especially in regions with limited datasets such as the drylands.

The L-moment-approach is an improvement over normal moment theory, as outliers and extreme events do not disproportionately influence distribution selection. As such, the RFA-LM method is the most approriate method in regions with interannual variability and short record lengths. More information on the methodology of the RFA-LM can be found here.


Nuñez, J.H., K. Verbist, J. Wallis, M. Schaeffer, L. Morales, and W.M. Cornelis. 2011. Regional frequency analysis for mapping drought events in north-central Chile. J. Hydrol. 405 352-366.

This map was developed in collaboration with Logo Brasil

Dataset Documentation

Drought Frequency Analysis

Drought Atlas of Latin America and the Caribbean
Data Source
CAZALAC Center, Drought Atlas
Regional Frequency Analysis using L-Moments


Access the dataset used to create this map.


Contact mwar_lac@unesco.org with any technical questions or problems with this Map Room.