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Bali, a small and active volcanic island in the humid tropics, is close to the east of Java, Republic of Indonesia, with an area of about 5,600km2 and a total population of about 2.8 millions. Subak system, a traditional irrigation system of Bali island, is considered to be an example of skillful and developed irrigation system at the foot of volcanic mountains.A large number of studies about the subak system have already been made, but there is no attempt to make clear the relationship between actual condition of subak system and its physical conditions.

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