Relationship between Drought and Rainfall Due to Tropical Cyclone and Depression in Ninh Thuan, Vietnam

Tropical depressions/cyclones are natural phenomena which might impact negatively on human beings and the environment. Like other natural hazards, they sometimes can cause severe damage to the economy, infrastructure and community so that the benefits that come along with such hazards have almost been neglected. On the land, rainfall during and after the tropical cyclones has significantly decreased drought conditions in some semi-arid and arid areas. In the case of Ninh Thuan Province, tropical depression/cyclones could cause the flooding in the area where it is passed, but the weak tropical depression/cyclones can help to increase 0.5 - 12.39 times of monthly rainfall and contribute to total rainfall of 7 – 40% in dry season; and 0.4-2.18 times and 37 - 145% in wet season, respectively; or 3 – 39% of annual climatological rainfall. As the results, agriculture economic and local people can be taken a benefit from tropical depression/cyclones. Based on these results, the authorities can have some strategies to adapt and develop the local economy after such natural hazards.