Bangkok's draft fourth comprehensive city plan, due to take effect next year, no longer includes the proposed monkey cheek retention basins, which the BMA says cost about 11 billion baht and need land expropriation. The BMA prefers canal improvements, diversion routes and drainage tunnels instead. Property analysts say floodways should keep strict development limits, and the draft raises density in areas such as Khu Bon and Nimit Mai. If you buy, build, or lease property, check whether the site lies in a floodway or low-lying zone on the draft water management map before committing.