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Journal of Environmental Hydrology
ISSN 1058-3912 |
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Electronic Journal of the International Association for
Environmental Hydrology
JEH Volume 19 (2011), Paper 1 Posted January 29, 2011 RAINFALL-RUNOFF MODELING IN THE AL-MADINAH AREA OF WESTERN SAUDI ARABIA
Ali M. Subyani1 2General Directorate of Water, Madinah, Saudi Arabia ABSTRACT The Al-Madinah area, which is located in the western region of Saudi Arabia, is characterized by extremely arid conditions. This area is also subject to flash flooding that occurs immediately after heavy, short rainstorms, resulting in loss of life, infrastructure, and property. This valuable and important area requires the development of sustainable structures that can withstand such flooding. In this study, a runoff model adapted from the US Soil Conservation Service was built for the catchments of five selected ungauged dry wadis in the Al-Madinah area. Data from 16 rain gauges that have been recording the annual maximum daily rainfall for over 30 years were analyzed and used to derive the Gumbel extreme value distribution for 25-yr, 50-yr and 100-yr return periods. Hydrographs for different return periods were drawn using the results from this analysis along with the morphometric parameters of the wadi catchments. Regional maps of maximum probable precipitation and probable maximum flood were also produced for the study area. These results will be helpful when decisions are made regarding the planning, management, operation, and maintenance of flood mitigation measures in this important area. Reference: Subyani, A.M., and F.S. Al-Ahmadi. 2011. Rainfall-runoff modeling in the Al-Madinah area of Western Saudi Arabia. Journal of Environmental Hydrology, Vol. 19, Paper 1. CONTACT: Ali M. Subyani Hydrogeology Department King Abdulaziz University P.O.Box 80206 Jeddah 21589 Saudi Arabia E-mail: asubyani@hotmail.com |
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