RESULTS & DISCUSSION
4.1 Rainfall in 29 years period
From exploring rainfall data, annual rainfall of the region ranged from the minimum in the Southwestern part,
778.25 mm, to a maximum in the Northeastern part, 3,021.50 mm. An example of fluctuating annual rainfall at 2
stations in the Southwest (Nakhon Rachasima Station) and the Northeast (Nakhon Phanom Station) of the study
area is shown in figure 2 where rainfall has fluctuated overtime. Rainfall in September and October in the Northeast
comes from The Northeast monsoon where the amount of rainfall is higher than in the Southwest.
In most areas or over 70% of the Northeast receives