ABSTRACT
Almost half of the world’s land area has arid and semi-arid climates, where rainfall is rare and irregular. Besides, 60% of these lands are in the developing countries (Singh et al. 1990 cited in Al-Ghafri 2012, 192). Despite the low availability of water, civilizations exist there since thousands of years. Man succeeded to fetch and supply water necessary for his subsistence from surface sources or from beneath the ground, which made his settlement possible in harsh conditions as those in the lands of Oman. Indeed, Oman is characterized by little and irregular rainfall, very high 198temperature, and low humidity in the interior of the country. Talking about settled life in Oman, Costa (1983, 275) writes, “Where life is hard and difficult, sometimes reduced to pure survival, the objet d’art tends to be absent: this, of course, does not mean that in those areas art is absent. Aesthetic values, taste and imagination find their ways of expression in the building styles, in the design and decoration of tools and weapons, in the patterns of weaving and basketry; they are also expressed in the design of the hydraulic works.” By hydraulic works, Costa means those systems that made settlements possible in the territory of Oman, throughout history: the aqueducts named locally aflaj (plural of falaj).
