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Accueil du site → Doctorat → Royaume-Uni → 1988 → Impact of floods on wadi occupants : An exploratory study of Wadi Khulays-Marrwani in Saudi Arabia

Kent State University (1988)

Impact of floods on wadi occupants : An exploratory study of Wadi Khulays-Marrwani in Saudi Arabia

Al-Doaan, Mahmoud I

Titre : Impact of floods on wadi occupants : An exploratory study of Wadi Khulays-Marrwani in Saudi Arabia

Auteur : Al-Doaan, Mahmoud I

Université de soutenance : Kent State University

Grade : Doctor of Philosophy (PhD) 1988

Résumé
This dissertation examines the impact of floods on wadi occupants, with special reference to Wadi Khulays-Marrwani in western Saudi Arabia. The main objectives were to study the impact of floods on wadis inhabitants and their vital infrastructure. And also to find an optimal protection measures to mitigate flood damages and reduce its risk. Three types of floods with different magnitude that affect Wadi Khulays were studied closely. These are : regular, medium and large floods. Data were collected from different sources such as government agencies, which furnished data for precipitation and runoff. Fieldwork investigation which helped in obtaining primary data such as : survey of the wadi bed, interviews of affected inhabitants, and response of the farm sample questionnaire. The study proved that, there is a strong relationship between flood damage and proximity to active channels. It also showed that 90% of the wadi occupied areas is under large flood impacts, 79.48% is under medium flood effects, and 3% is under regular flood threats. It was also found that the zero damage line or (safe site from flood danger) is matched with the 75 meter contour line above sea level or (11 meters above the dutum line 64 meters). Solving the flood problems in Wadi Khulays-Marrwani can be achieved through three major components : first, relocating of settlements and other vital infrastructure subject to floods to more secure areas. Second, prohibiting human misuse of the wadi major flow courses. Third, installment of adequate flood control measures to secure human lives and significant mobile properties. The study recommendations indicate that more safety can be achieved by implementation of the following : installment of a warning system, introduction of a flow distribution system for the Khulays fan, construction of a dam, and building of a shelter home for those highly threatened by floods. Further studies of occupants perception is highly recommended.

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