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Updated: Oct 27, 2025

Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
Published on: November 13, 2017
A case study of flood frequency analysis by intercomparison of graphical linear log-regression method and Gumbel's
M Ramasamy1, S Nagan1, P Senthil Kumar2
1Department of Civil Engineering, Thiagarajar College of Engineering, Thirupparankundram, Madurai, 625 015, Tamil Nadu, India.
Abstract:
Flood Frequency Analysis (FFA) is a systematic tool used for an efficient hydraulic structures design, operation and maintenance. An effort is made to study and compare the Linear Log Regression Graphical Method (LLRGM) and Gumbel's Analytical Method (GAM) to assess the future flood magnitude for any given Return Period (RP). Twenty-four years of annual daily peak flood flow value recorded at Vaigai reservoir gauging station between the year 1995 and 2018 was used in the two methods for detailed analysis. The results indicated that the GAM predicts the maximum possible optimum future flood in comparison with the LLRGM. This conclusion was drawn based on the coefficient of determination R2 obtained as 0.8904, which is nearing 1. Based on the analytical method of Gumbel's, the magnitude of frequency factor K has been introduced based on the size of data and coveted RP. The comparative study will provide boon to regulate the storage water to the posterior areas concerning safety and optimum utilization of water for various uses.
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