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Sensitivity analysis of runoff hydrographs due to temporal rainfall patterns in Makkah Al-Mukkramah region, Saudi Arabia

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Abstract

Runoff peak and volume in flood studies are estimated relying on temporal rainfall distribution from various storm patterns. Usually, SCS distributions types (I, II, III, IA) are commonly used. Using these distributions in runoff calculations assume that the in situ temporal rainfall pattern typically behaves as the one described by the SCS-type distribution, which is due to cyclonic frontal storms and actually developed in temperate environment. To what extent such assumption is valid in the arid environment? How much the impacts of rainfall temporal patterns are reflected in runoff volumes and peaks? The aim objectives of the current study are to answer the above two questions and clarify the validity of aforementioned assumption and exemplify such effect. Real rainfall data collected from rain gauges of Makkah Al-Mukkramah region over a period of more than 20 years are utilized. Temporal rainfall patterns and their parameters are deduced. Many hydrological simulations are performed and comparisons, in terms of runoff volume and peak flows, are made to show the effects of the common rainfall storm patterns and the developed rainfall storm patterns in the region based on the current study. Results indicate that major bursts of the design rainfall storm pattern are located in the first time of the storm period in the two quartiles which is mainly due to convective rainfall type in thunderstorms unlike the commonly used by SCS types relying on frontal cyclonic storms. Makkah Al-Mukkramah temporal rainfall pattern does not behave as the “typical pattern” assumed by SCS distributions that are deduced from different environments. The impacts of the temporal pattern reflected as an overestimate in the runoff peak reached to 68 %. The developed hyetographs and tables presented in the current study are recommended to enhance economical and rational design practice in watersheds of Makkah Al-Mukkramah region.

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Acknowledgment

The authors would like to thank Mr. Abdelaziz Al-Bishri and Mr. Abdullah Al-Maliki, the technicians at the department of hydrology and water resources management, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University for keen helping. The first author is on leave from Faculty of Engineering, Azhar University, Cairo, Egypt, and the second author is on leave from Faculty of Engineering, Mansoura University, Mansoura, Egypt.

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Authors and Affiliations

  1. Department of Hydrology and Water Resources Management, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, P.O. Box 80208, Jeddah, 21589, Saudi Arabia

    Hatem A. Ewea, Amro M. M. Elfeki, Jarbou A. Bahrawi & Nassir S. Al-Amri

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  1. Hatem A. Ewea
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  2. Amro M. M. Elfeki
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  3. Jarbou A. Bahrawi
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  4. Nassir S. Al-Amri
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Correspondence to Hatem A. Ewea.

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Ewea, H.A., Elfeki, A.M.M., Bahrawi, J.A. et al. Sensitivity analysis of runoff hydrographs due to temporal rainfall patterns in Makkah Al-Mukkramah region, Saudi Arabia. Arab J Geosci 9, 424 (2016). https://doi.org/10.1007/s12517-016-2443-5

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  • DOI: https://doi.org/10.1007/s12517-016-2443-5

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