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The primary function of HYFRAN-PLUS is to fit statistical distributions to data series that are independent, identically distributed (IID), and stationary. This is critical for infrastructure planning and risk management in various fields:
Hyfran Plus, developed primarily for the field of hydrology, is a software package dedicated to the frequency analysis of extreme values. Its name, a portmanteau of "Hydrological Frequency Analysis," signals its specific purpose. Unlike general-purpose statistical software such as R, Python, or SPSS, which offer broad analytical capabilities, Hyfran Plus is finely tuned for the specific requirements of water resource engineering. Its primary objective is to help professionals estimate the magnitude of events (such as a 100-year flood) corresponding to specific return periods, a process essential for ensuring public safety and infrastructure resilience.
HYFRAN-PLUS represents a mature, research-backed solution for hydrological frequency analysis. Developed at one of the world's leading centers for statistical hydrology research, the software combines comprehensive distribution libraries, sophisticated fitting methods, and an intelligent Decision Support System to help engineers and researchers make informed decisions about extreme event analysis. hyfran plus
The software assumes that data series are . These assumptions must be verified before analysis, as violations can lead to incorrect conclusions.
The software was developed by the research team of Professor Bernard Bobée at the in Québec, Canada. It represents a significant evolution of the original HYFRAN software. A key enhancement is the integration of a Decision Support System (DSS) which helps analysts select the most appropriate class of statistical distributions for their specific dataset. While its primary application is in hydrology for analyzing extreme events like floods and heavy rainfall, its robust statistical framework allows it to be used for fitting statistical distributions to any Independent and Identically Distributed (IID) data series, finding applications in environmental science, engineering, meteorology, and even medical sciences. The primary function of HYFRAN-PLUS is to fit
results are frequently used to define input data for more complex modeling systems, such as HEC-HMS (Hydrologic Modeling System), which helps simulate rainfall-runoff processes. 4. Why Use HYFRAN-PLUS for Frequency Analysis?
Identifies and isolates unrepresentative data spikes that could disproportionately skew the distribution's tail behavior. Supported Probability Distributions Developed at one of the world's leading centers
A 2022 study used the HYFRAN-PLUS model to generate and analyze rainfall data for the Al-Madinah Munawwara region. By comparing data from 1960–1990 and 1990–2020, the study successfully demonstrated a significant climate change impact on rainfall patterns, offering crucial insights for water resource planners to design appropriate storage systems and assess future water availability.
This article provides an in-depth look at what Hyfran Plus does, its applications in modern hydrology, and why it is a preferred tool for analyzing maximum daily rainfall and flood data. What is Hyfran Plus?