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Case Studies | Engineering Science | Saudi Arabia | Volume 13 Issue 5, May 2024 | Popularity: 4.7 / 10

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Flash Floods Mitigation for Al Kharj City, KSA: Case Study

Mohamed Sh. El-Manadely, Mostafa A-B Ebrahim

Abstract: Al Kharj city is under the effect of wadis of 14166 km2 catchment area. Due to its urban expansion, many rainfall events led to flash floods that inundated parts of the city and caused huge economic losses. A man - made water passage was constructed to convey flash floods to the city downstream. A hydrologic study is carried out for estimating 100 yr. design storm, delineating of wadis, determining their morphological characteristics using Watershed Modeling System (WMS) and estimating the maximum flood discharge using Hydrologic Engineering Center - Hydrologic Modelling System (HEC - HMS). The dimensions of this passage and the associated culverts are proved insufficient for rainy storms of 50 yr. return period or larger which led to water spillage. Two solutions are proposed. The first is to re - design the water passage and the culverts to convey the 100 yr. flood using Hydrologic Engineering Center - River Analysis System (HEC - RAS). The second solution is to construct series of dams on selected upstream wadis. A comparison between the two solutions is provided.

Keywords: design; flood management; hydraulic; hydrology; surface runoff; mitigation; flash

Edition: Volume 13 Issue 5, May 2024

Pages: 802 - 808

DOI: https://www.doi.org/10.21275/SR24513131636

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