Rainfall measurements in Bolivia: Conversion of statistics from 15-min to 1-min by EXCELL RSC model and accuracy test of ITU-R P.837

Abstract

The comparison of 1-min rainfall rate measurements with predictions from ITU-R P.837-7, in different regions and climates is useful for testing and improves its accuracy. We report for the first time, results of a comparative study in Bolivia. The ITU-R P.837-7 method is tested against precipitation data gathered in 3 pluviometric stations, with 15-min time resolution. EXCELL RCS model is used for downconverting statistics to 1-min integration time. A slight correction on this model was needed for 2 stations located at high altitudes. Error analysis for each station shows that ITU-R P.837-7, using monthly mean total rainfall as input, has good performance. In absence of this information, predictions based on digital maps produce an increase of error metrics. EXCELL RCS model has demonstrated being a tool helping to overcome the lack of 1-min rainfall measurements. We believe our findings contributes to rainfall modelling for propagation purposes in South America.