Cabinet approved the Khlong Wang Tanot reservoir in Chanthaburi on 5 Aug 2026 (budget 7.2 billion baht, 99.5 million cubic metres, planned build 2027-2033). Construction cannot start yet: a royal decree must first remove part of the national park area and the Royal Forest Department must grant use of the land. The official warned that EEC water demand, especially from data centres, is rising faster than new supply. For a Chanthaburi or EEC business, water supply is a long-term risk, not a near-term fix, so plan for continued water constraints and keep current supply arrangements in place.