This issue highlights the importance of risk management for water security, not only in Rayong but also in the greater region. By conducting a risk assessment for the East Coast - Gulf Basin using the water balance and scenario analysis (HAII, 2008b), we were able to create flood and drought risk maps (Figure 8). In this case, the Mab Ta Phut area typically has a risk of drought whereas two out of three areas (areas 3, 4 and 5 in Figure 8) supplying water to Mab Ta Phut have a severe drought risk and one of them also has a risk of flooding