Rainfall Intensity – Duration Frequency Curves for Maxima Duration Series for Ondo Town, Ondo State, Nigeria
Keywords:
Rainfall Intensity, Total Amount, Rain, Maxima Series, and Duration Frequency Curves.Abstract
Rainfall intensity is defined as the ratio of the total amount of rain (rainfall depth) falling during a given period to the duration of the period It is expressed in depth units per unit time, usually as mm per hour (mm/h). The statistical characteristics of high-intensity, short-duration, convective rainfall are essentially independent of locations within a region and are similar in many parts of the world. Analysis of short-term rainfall data suggests that there is a reasonably stable relationship governing the intensity characteristics of this type of rainfall [1]. Point rainfall average intensities and return periods for specified durations were calculated for annual maxima series. Plots of these were made to give the intensity – duration frequency curves. The amount of rain expected in 12 hours on the 50 – years curve is about 17.5mm per hour. Also, at the 10 – year curve, the average intensity corresponding to 12 hours is about 12.4mm per hour. This study is used for various water resources engineering designs and planning.
References
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[5]. World Meteorological Organization (WMO) Laboratory Intercomparison of Rainfall Intensity Gauges, September 2004 – September 2005 Available online at http://www.wmo.int/pages/prog/www/IMOP/publications/IOM-84_Lab_RI/IOM-84_RIgauges_Sept2004-2005.pdf
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