IDFequations: an R-based tool to generate intensity-duration-frequency (IDF) equations

Abstract

Abstract IDFequations is a tool for determining intensity-duration-frequency (IDF) equations. It was specially developed to facilitate the adjustment of different probabilistic models in the frequency analysis of historical precipitation series and the adjustment of the IDF curve model without the user requiring prior knowledge about the model parameters. The tool integrates the ten most used statistical distributions to estimate maximum 1-day precipitation values for different return periods (Tr). A fitting equation was used to estimate sub-daily rainfall. The empirical parameters (k, m, t0 and n) were defined using an algorithm developed in the R programming language. It is directly connected to two precipitation database servers. It also provides IDF equations from precipitation estimation remote-sensing and local data.