The year 2020 is destined to be an extraordinary year, the epidemic has not yet completely passed, and flooding has occurred in many places. The frequent occurrence of urban flooding has exposed the problems in urban planning and construction. The scale of urban development and construction has increased and exacerbated the impact of flooding. The causes of urban flooding are complex, inadequate drainage system is a major cause of flooding in Enshi, but there are other reasons.
First of all, let's talk about the problem of inadequate drainage systems. City construction is very fast, the city area is constantly expanding to the periphery, the previous upstream has become downstream, due to historical reasons, China's urban stormwater system design reproduction period has been relatively low, the original design to meet the original area of the drainage system is difficult to withstand the rainwater catchment area of the increasing , the new upstream area of the constant discharge of rainwater, so that the old pipe The new upstream area is constantly discharging stormwater, making the old pipeline far from being able to meet the drainage requirements.
Secondly, the negligent management of the drainage equipment, prevention is also an important reason. Some of the equipment is in disrepair, resulting in flooding disaster does not play a role. And in the prevention process, do not do enough preparation is also the main cause of urban flooding.
Finally, more precipitation in the south, the frequent occurrence of extreme weather in recent days is an important reason. Due to the uneven spatial and temporal distribution of rainfall in China, most cities experience heavy rainfall every summer. Large amounts of rainfall in a short period of time paralyze urban drainage systems. The rapid development of cities creates an urban heat island effect. As a result, the distribution and intensity of urban rainfall centers have changed. As the size of the city continues to expand, the density of roads and buildings also increases. Under the same weather conditions, urban areas absorb more solar radiation than suburban areas. In addition, production and living in cities generate a lot of heat, forming a heat island effect, which then produces a lot of rainfall. This phenomenon is more likely to occur in large cities and highly urbanized areas, and is more likely to be the center of regional storms and more frequent occurrences of high-intensity rainstorms.