59. What are the "three zones" in flash flood disaster-prone areas?

The "three zones" of mountain flood disaster-prone areas refer to dangerous areas, warning areas and safety areas, which are divided according to the possible situation, degree and scope of mountain flood disasters. Dangerous area refers to the production and living area that is submerged after flash floods, which may cause disasters such as mountain collapse, landslide and debris flow, water and debris flow, seriously threaten people and infrastructure such as houses, roads and farmland, and even cause huge losses. According to the division of flood areas, that is, the areas below the once-in-a-decade flood inundation line on both sides of each river belong to dangerous areas. Anyone who lives in a dangerous area must accept the warning signal issued by the superior within 2 hours of the rainstorm and make good preparations for personnel transfer. If the rainfall reaches 70~ 100 mm or more in a short time, it is necessary to immediately send out the signal of personnel safety transfer, and the people in the area should evacuate the dangerous area in an emergency and orderly manner and move to the pre-defined safety zone to avoid flood losses. The warning zone is higher than the danger zone, which is located between the once-in-a-decade flood line and the once-in-a-century flood line. Similarly, people in this area must accept the early warning signal sent by their superiors within 2 hours of the rainstorm, especially those near the dangerous area must be prepared for personnel transfer. At the same time, continue to patrol and closely observe the rain and water dynamics. If the water level rises rapidly, the signal of personnel transfer should be sent in time to evacuate personnel to a safe area in time to avoid flash floods. Safe area refers to an area that is not affected by rare floods, is not easy to cause disasters, and has a relatively stable geological structure, which can be used for people to live, produce and live temporarily or permanently.