Drought is a natural phenomenon considered a natural disaster, caused by a serious shortage of rainfall over a long period of time, reducing the moisture content in the air and the water content in the soil, depleting river flows. streams, lowering of pond and lake water levels, water levels in underground aquifers, adversely affecting plant growth, causing environmental degradation, causing poverty and disease ... if arranged in order of cause Property and life losses worldwide are the fourth most drought-prone after floods, earthquakes and typhoons. Particularly for the Central Highlands region, drought is a natural disaster causing the most negative impact on the life and production. Due to abnormal weather, rainfall is often prolonged or temporary Very little rain, negligible rainfall for a long time almost all year round, this is a common situation in arid and semi-arid areas. Rainfall over a long period of time is significantly lower than the average for many years of the same period. This situation can occur in most areas, including rainy areas. It does not rain very little, but in a certain period of time it did not rain or it just met the minimum needs of production and the surrounding environment. This is a common situation in monsoon climate regions, with a marked difference in rainfall between the rainy and dry seasons.