The Co Chien River in Tra Vinh province, at certain moments in the day, is the source of freshwater, an overseas Vietnamese man has discovered. A river water monitoring buoy provides a solution to local farmers to get freshwater for irrigation. For Vietnamese farmers, four elements, arranged in order of significance, are involved in the production of rice: water, fertilizer, diligence, variety. Meanwhile, Mekong Delta last year suffered the most severe drought in history. The lack of water dried out rice fields. Nguyen Thanh My, a Viet Kieu (overseas Vietnamese) in Canada, then vowed to find a solution to the freshwater supply in Tra Vinh province.