Best index for measuring time interval that VCI can be caused drought severity of drought, as well as the impact of plants. In addition to this. This study also has to find a relationship between the two with a drought index depth of rain accumulated in each of the ping River basin, on the steps to use to select the most reliable estimate for drought and other water groups. In the next country Thailand as a result of that, there are monthly average NMDI index is the lowest in February and an increase equal to 0.408 continuously until the maximum value is equal to the value in July NMDI index is 0.545 changed little until August. Since then, the value of the index NMDI dropped steadily until a minimum value in February. For the VCI has been changed in the index as the index NMDI, with the highest monthly average in November, equal to the minimum, and in March, 0.846 is equal to basic, which can be summarized in 0.617 that VCI has NMDI and index can be applied in the evaluation of drought conditions.Machuen or dry conditions, because the two have a relationship to the index in the same direction, with the drought conditions occurred in each sub basin. Later, Take both drought index is related to the depth of rain accumulated in each year between the months of April through August of each sub basin. It was found that the index is the relative coefficients of the United NMDI (r) equals 0.689 across sub-basin, which are relatively high to very high. While the General index is up r VCI sub basin, which are equivalent to 0.290 is quite low, so that NMDI is the proper index used to evaluate State drought for other countries Thailand from watershed assessment index NMDI by the data between 2549 (2006)To 2553 (2010) found that the basin that contains the highest moisture condition 3 is the first basin of southern Songkhla lake basin on the West Coast, and the Pattani basin. Best the watershed there is a maximum of three drought-hit first is the Mekong River (northeast), the basin and the Wang basin from these studies. Shows that NMDI is the drought index is suitable to be applied to check the moisture and drought conditions.
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