precipitation is dominated by monsoon circulation mechanism Southeast Asia and is affected by terrain conditions, so closely associated with the northeast monsoon. In a year's existence 2 seasons: the rainy season (May rainfall> 100 mm with a frequency of ≥ 75%) lasted 4 months, from September to May 12. The dry season (May rainfall <100 mm with a frequency ≤ 75%) lasted 8 months, from May 1 to May 8. the average annual rainfall in the study area change from 2500 to 3000 mm. Interannual variability of rainfall and maximum 2 2 minimum. The main maxima occur in October with from 762 to 924 precipitation mm, maximum sub happen in May or June (rain leading to sub-chronic) with rainfall from 77 to 225 mm. Main minima occurred from February to April with rainfall from 34 to 85 mm, the minimum side occurred on July rainfall from 71 to 110 mm.
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