A Frequency Surface for Rainfall Intensity and Durationby G. V. Loganathan, Virginia Tech, Blacksburg, United States,
M. A. Parkin, Virginia Tech, Blacksburg, United States,
Abstract: A technique for developing rainfall intensity-duration-frequency surface is presented. With the aid of the Box-Cox power transformation raw data is transformed into a jointly near normally distributed data. The joint distribution is used to estimate the conditional probabilities (conditioned on duration) of storm events. The method fits the surface over the entire data set instead of taking the conditional traces as done in frequency curve fitting procedures over a few selected subsets of data. The frequency surface procedure permits one to generate frequency curves at arbitrary durations which easily aids in computing peak discharges resulting from arbitrary times of concentration. The methodology is illustrated with the aid of a real life data set.
Subject Headings: Rainfall intensity | Rainfall duration | Rainfall frequency | Curvature | Arbitration | Power transmission | Joints | Probability distribution
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