在易受洪灾影响的国家，城市规划方案应当综合运用包括排水系统、堤坝和海墙等灰色基础设施，以及湿地和森林保护等绿色举措。
In flood-prone countries, city-planning schemes should blend gray infrastructure, such as drainage systems, dikes, and sea walls, with green measures, like conservation of wetlands and forests.