Hyfran Plus

HYFRAN-PLUS is built on rigorous statistical foundations. The software allows users to fit a large number of statistical distributions to data series that satisfy the fundamental assumptions of . These assumptions are essential for valid frequency analysis, and HYFRAN-PLUS provides built-in tests to verify them.

: This is the "Plus" in HYFRAN-PLUS. It uses graphical tools and statistical tests (like the Jarque-Bera or Wald-Wolfowitz tests) to classify data based on its "tail behavior," helping users distinguish between regular and sub-exponential distributions to avoid underestimating rare, high-impact events. Data Validation : Before fitting, the program can run tests for independence, stationarity, and homogeneity

Another significant feature of Hyfran Plus is its ability to handle historical and censored data. In many parts of the world, systematic records of river flow only began in the mid-20th century. However, there may be historical evidence of massive floods that occurred prior to instrumental records (paleo-floods). Hyfran Plus allows for the integration of this qualitative historical information into the statistical model, effectively extending the effective record length and reducing uncertainty. This capability is crucial for "low-flow" analysis as well, aiding in the management of droughts and water supply allocation during dry periods.

Meet the new standard: Hyfran Plus. 💙 Effective. Reliable. Essential. hyfran plus

Hyfran Plus is a software program dedicated to performing on data series, particularly those dealing with extreme values, such as maximum daily rainfall, peak river flows, or flood events. It is developed to assist researchers and engineers in determining the probability of specific occurrences, which is essential for determining return periods (e.g., 100-year flood).

HYFRAN-PLUS is a commercial software product with a clear and transparent pricing structure:

, primarily designed to estimate the probability of extreme events such as floods and storms. It is widely used by hydrologists to fit historical data to various statistical distributions to predict future occurrences over specific return periods (e.g., 10, 50, or 100 years). ResearchGate Core Functionalities HYFRAN-PLUS is built on rigorous statistical foundations

Another study in the Al-Khoser River Basin used HYFRAN-PLUS to test eleven probability distribution functions. Among the tested distributions, the , followed by log-normal and gamma distributions. The study generated synthetic storms for return periods of 5, 10, 25, 50, and 100 years to construct IDF curves for improved storm management.

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HYFRAN-PLUS stands out due to its rich set of features that guide the user from raw data to reliable predictions. The software (Version 2.2) is available in both English and French. : This is the "Plus" in HYFRAN-PLUS

In conclusion, Hyfran Plus represents a critical intersection of mathematical rigor and practical engineering necessity. While it may lack the flashiness of modern big data dashboards or machine learning platforms, its reliability and specialized focus make it an indispensable tool in the hydrologist’s toolkit. By standardizing the complex process of frequency analysis, Hyfran Plus ensures that the infrastructure society relies upon is built not on guesswork, but on a solid foundation of statistical probability and historical evidence.

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