Solutions to deal with flooding by using green buildings in Vietnamese urban areas from Japanese experience

One of the major problems of big cities in Vietnam is deep flooding in the rainy season, frequent traffic jams, fewer green areas, green parks are narrowed or exploited for commercial exploitation and services. The above consequences are due to many reasons such as rapid urban development, encroachment of rivers and streams that break the natural landscape, lack of synchronous planning ... there is still a lack of reasonable technical solutions. Japan is a country with a lot of experiences in flood prevention, about preserving a safe and close environment to nature. These solutions can be an idea for strategic decision makers, governments and the whole community to refer to Vietnam, especially big cities like Ho Chi Minh City learning and applying. Here are some experiences from Japan analyzed and opened by the author to contribute ideas for our city to become more civilized and worth living.