Abstract
Flood water dangerous are increasing worldwide as a result of frequent recurrence of large floods in many areas due to severe climatic changes taking place in the world in recent times and their impact on rainfall intensities and duration periods. Three years ago Dhukna city exposed to an extreme storm, which leads to that the right bank of the great valley passing on the Eastern side, U\S of the main culvert, has been collapsed. In addition, the water surface has been recorded to be passing over the main culvert (32 vents each of 2.5m x 1.5m) by more than one meter. The present paper introduces a study for the hydrological characteristics of Dhukna city, Qassim region, KSA, as one of the cities expected to be exposed to dangerous of floods due to a steady civil development in the different utilities, especially asphaltic surface roads areas. The characteristics of the different drainage basins spill its water to the city, have been well defined. The SCS-CN method has been used to estimate the flood water quantities for all surrounding drainage basins which drain its water directly to the main valley, especially that passing through the city. Also, the performance of the existing main culvert is evaluated and its efficiency has been checked. A proposal has been suggested to increase the main culvert efficiency and to accommodate the expected incoming flood water through the great valley.
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