Heavy rain in Chongqing: Taxi floated in waist-deep water. Why does the city suffer from waterlogging?

Heavy rain in Chongqing: taxis floated in waist-deep water. Waterlogging in the city is caused by extreme weather, urban topography, aging drainage systems, and urban construction planning. 1. Extreme weather Extreme weather occurred in Chongqing, with heavy rain to heavy rain in places. Banan, Qijiang, Fengdu, Kaizhou, Yunyang, and Wansheng, 16 rainfall stations reached the heavy rain level, with the highest precipitation in Wansheng area being 87.3 mm. The maximum hourly precipitation along the Banan Tiaoshi beach is 64.4 mm. 2. Areas with relatively high urban topography are less likely to accumulate water. Since Chongqing is a mountain city, water flows downward from high. The upper half of Chongqing has a relatively high terrain, so there is no accumulation of water. As the rainfall increases, all the water flows to the lower half of the city. Therefore, the places where water accumulates are usually in the lower half of the city, which is a relatively low-lying place. 3. Aging drainage systems

The drainage pipe systems in some cities in my country are in debt, the pipelines are aging, and the drainage standards are low. In some areas, incomplete drainage facilities and backward drainage system construction are the main factors leading to urban waterlogging. 4. Urban construction planning In cities, many hard pavements such as asphalt roads and cement roads have poor water permeability and are not easy to penetrate when it rains, and can easily cause water accumulation.

Ponds, lakes, farmland and other ground with high water permeability are a kind of "natural reservoir", which can help rainwater penetrate into the ground, thereby reducing ground water accumulation. With the acceleration of urbanization, some natural water storage spaces such as rivers and lakes have been filled in and occupied, objectively increasing the pressure on urban flood control.

Some cities do not fully consider this during planning and construction. When building roads, some cities cut off natural drainage lines and rely only on culverts to connect roads, changing drainage from "line" to "point", increasing the pressure on waterlogging and flood discharge.

In some areas, when designing low-lying areas, they did not consider the problem of water accumulation and blindly adopted tunnel solutions, burying the hidden danger of waterlogging.