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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11834

Title: RAINFALL INTENSITY-DURATION-FREQUENCY RELATIONSHIP FOR SOME REGIONS IN SAUDI ARABIA
Authors: Ibrahim H. Elsebaie
Keywords: IDF curve, rainfall intensity, rainfall duration, rainfall frequency relationships
Issue Date: 2011
Publisher: International Journal of Arts & Sciences (IJAS), CCSU, USA
Abstract: Intensity-Duration-Frequency (IDF) relationship of rainfall amount is one of the most commonly used tools in water resources engineering for planning designing, and operation of water resources projects, or for various engineering projects against floods. The objective of this research is therefore, to derive IDF relationship of rainfall for two regions in the kingdom. These relationships are useful in the design of urban drainage works, culverts and other hydraulic structures. Two commonly frequency analysis techniques were used to develop the relationship between the rainfall intensity, storm duration, and return periods from rainfall data for two regions in Saudi Arabia. These techniques are: Gumbel and the Log Pearson Type III distribution. In order to do that, rainfall data was obtained for different durations. A set of curves was plotted using the intensity-duration-frequency data to be the basis of the analysis. An equation for calculating rainfall intensity for every region was derived based on the results obtained from the IDF data. The results obtained using Gumbel distribution are slightly higher than the results obtained using the Log Pearson III distribution. In general, the results obtained using the two approaches are very close and have the same trend. Rainfall intensities are drawn from these two methods and the results obtained from that work showed good consistency with what has been done before in some parts of the study area. The chi-squared goodness-of-fit test was used to determine the best fit probability distribution. Further studies are recommended whenever there will be more data to verify the results obtained or updating those IDF curves.
URI: http://hdl.handle.net/123456789/11834
Appears in Collections:College of Engineering

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