In recent years, many cities in our country have been affected by heavy rain, especially large cities, which usually suffer heavy rain, and the waterlogging is very severe, which may even lead to the situation of employees' casualties and industrial damage.
The reason for the urban waterlogging?
Most of us have only seen the richness of the surface of the metropolis, but have not gone into the dangers hidden underground. The current situation in our country is that there will be equipment on the ground to make great progress, but the underground pipe network is unattended, and the accumulation of the last moment, the title is getting more and more serious, and the handling is getting more and more difficult.
The metropolis is flooded, and some people customarily attribute it to natural disasters and human disasters. Many local authorities have also seized this and organized the expansion. The media also followed the report, but it covered the real reason for the metropolis flood. Furthermore, the masses thought that the cause of the waterlogging of the city was natural disaster. So is it true after all?
Natural disasters that cause urban flooding:
Reason one: Metropolitan sponge screening
In the past, wetlands such as mud, lakes, grasslands, fish ponds, and farmland were more specific. These wetlands now seem to be the "sponge bodies" in the sponge cities we are constantly launching. Following the expansion of the city, sponges such as oasis and ponds were screened, and the hardened road surface increased. Only the city drainage pipe network can be used for drainage. Water seepage rate and water retention skills are not as good as before.
Reason two: Metropolis rises inland
The city will be equipped with a layout that loves the structure along the banks of the river. How beautiful it looks, but the disadvantages on the back are: if it receives heavy rain and water accumulates in the upstream of the river, the vulgar will also present a rising water level environment, which will make the metro underground The water level of the net rises, showing signs of obstruction.
Reason three: Metropolis heat island effect strengthens
With the rapid growth of the metropolis, the dust in the metropolis, the increase of automobile exhaust, and the level of the heat island effect become more severe, which in turn constitutes the rain island effect. The heavier the metropolis, the greater the rainfall. Rainfall in the sky has increased, soaked secretion skills on the ground have dropped, and the urban drainage pipe network has not yet had an effect, and then constitutes waterlogging.
Man-made disasters that cause urban flooding:
Reason one: Metro sewer network inspection is not in place
Most of them will be sewer networks, short and severely blocked, which is caused by a long absence of inspection. The sewers will be built in seven points and maintained in three points because maintenance is very serious.
The second reason is that the equipment and layout plan will be unfair.
Signs such as unfair land occupation are severe. For example, in order to expand the metropolis, the infiltrated locals have been built into buildings, and the metropolitan river has been leveled.
There are three reasons for this: the urban drainage standards are not up to standard
Reason 4: Difficult to handle underground drainage network in metropolis
The involved parts are complicated: municipal administration, water conservancy, metropolitan scheme, garden setting, etc. At this time, a strong part is necessary to reconcile.
There are five reasons for this: the cost of underground pipe network equipment
There are hundreds of millions of dollars in one kilometer, and long and huge financial budgets are necessary.
Reason six: Underground pipeline network configuration and arrangement can not see results in a short time
Because of the underground facilities, it is difficult for people to pay attention, and if there is no heavy rain in the short term. The effect of the underground pipe network is difficult to exert.
International metropolitan waterlogging methods:
Paris: 50 meters underground, Paris has the most prosperous underground pipeline system in the country. It took 126 years for the Parisians to complete the construction. The waterways are crisscrossed and dense like spider webs. They are also extremely wide together.
Paris's sewers are attractions, and more than 100,000 tourists are welcomed every year. Paris is equipped with an underground water museum
Japan: At the end of the fifties of the last century, Japan's economic growth was similar to that of China. After entering the rapid economic growth for a long time, it was suffering from waterlogging due to the backwardness of the sewer system. Tokyo, Japan, floods Jinshan with rainstorms and watches the sea at home.
In 1964, Japan established a special underground pipe network induction management section. The same sewer was equipped with layout and sewage standards, replaced aging pipelines, and the Sewer Law was substantially revised. After the legislation, the sewers will be regulated. Huge budgets are invested each year. Tokyo's sewer drainage standard is once in 5-10 years, and the widest sewer can reach 12 meters.
How to deal with metropolitan waterlogging:
According to the Ministry of Housing and Urban-rural Development and Arrangement Department of China, the "Sponge Metropolis Arrangement and Arrangement Technology Raiders" was issued, which pointed out that the installation and arrangement of sponge cities is the key to the continuous progress of the "sponge body" scale and quality. If conditions permit, a "sponge body" of a certain size should be built. Some natural wetlands existing in the metropolis must be vigorously protected, but it is not enough to deal with metropolitan waterlogging only by natural wetlands. It is necessary to build some sponges. These sponges include: pervious bricks
and rainwater network systems. The permeable brick
has very good water seepage and water retention effects, and the rainwater network system has water storage and purification effects. The two are used scientifically and fairly, and it will be very useful to resist the pressure of the municipal pipelines.