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Drainage Analysis Of Mountainous Watersheds In Ras Al Khaimah Emirate, Uae

By Author: Suba karan
Total Articles: 23

The United Arab Emirates (UAE) is void of any rivers or perennial streams. However, a number of Wadis of different categories and valley beds are present. Wadis are mostly dry but they drain the runoff to their regions only during the rainy seasons. The runoff generation from the rainfall behaves differently from one Wadi to the other according to the nature of topography and headwater catchments. In the mountains, floods are the result from heavy rainfall where small part of the rain water infiltrates in the Wadi beds and thus produce fairly large flood discharge. Most of the annual rainfall therefore reaches the plain which corresponds to a relatively high annual runoff. The mean annual runoff of major wadis in U A E is about 120 MCM [1]. In the piedmont areas, both infiltration and runoff are observed. Therefore, heavy rainfall may give rise to runoff, even in a fairly permeable zone (gravel plain). A large part of the annual rainfall in this area flows out into the dune region. In such a region where runoff is almost inexistent, the only water loss is due to evaporation. The water loss is directly proportional to the number of days of rainfall and its depth.

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