In recent years, the hidden pain of flooding caused by Kunming every rainy season has always become the focus of people's attention↓↓
Rainfall in Kunming on June 6, 2020 Backflow of manholesâ–˛
Rainfall in Kunming on July 24, 2021â–˛
July 2020 It rains on the roadâ–˛
In 2020, Xingyao Road is close to the intersection of Guangfu Roadâ–˛
. So optimistic and strong Kunming people have almost insurmountable anxiety about the problem of flooding.
This year’s flooding seems to have come a little earlier than in other years. Rainfall on the evening of June 6 continued until June 7, causing many roads in western Kunming to be flooded and causing traffic control on some roads.
Subsequently, in response to the question "Why is Kunming's western urban area repeatedly flooded?", the Kunming Municipal Water Conservancy Bureau publicly responded to citizens, saying that there are three reasons for the flooding of the western urban area.
First, short-term heavy rainfall under extreme meteorological conditions exceeds the drainage capacity of rainwater channels;
Second, the drainage system in the area is a combined rainwater and sewage system. Rainwater and sewage in the area mix into Lanhuagou and the upper section of the Cailian River. When the river gates are closed, At this time, the mixed rainwater and sewage flow enters the first water purification plant for treatment. When the amount of water collected in the rainfall interval exceeds the treatment capacity of the water purification plant, there will be no other drainage channels in the catchment area, which will cause waterlogging in the city. Water accumulation points such as Shulin Street, Liujiaying area, and Yongchang area are more typical;
The third area is There are shortcomings in the pipeline network construction system, which affects flood control. For example, due to the construction of Metro Line 5 in the Wuhua Gymnasium area and Fuhe Lane, the rainwater system in the area was damaged and new waterlogging points were formed. In the Qianwei West Road and Century Peninsula area, due to systematic insufficient construction of the rainwater and sewage pipe network around the Qingshui River, the road rainwater and sewage were not diverted, resulting in overall high water levels in the rainwater and sewage pipes along Guangfu Road and Qianwei West Road, causing short-term strong Rainfall causes drainage pipes to overflow into roads, causing flooding.
Throughout the city, Kunming Drainage Company has begun to establish a triple protection system in an attempt to reduce the impact of flooding on citizens.
The first layer of protection is a meteorological early warning system established in cooperation with the Kunming Meteorological Bureau. The system mainly shares 163 rainfall stations in Kunming city . The data of the rainfall stations can be obtained in real time. It takes about five minutes to obtain one data. When heavy rainfall occurs, you can see which areas have rainfall through the map display. Stronger, so that personnel can be mobilized to carry out on-site duty and conduct inspections in advance.
The second layer of protection is a liquid level online monitoring system built in the public drainage pipe network in the main urban area of ​​Kunming. has now installed 313 sets of liquid level monitoring equipment, which can provide long-term online stable and continuous monitoring and timely warning and forecasting.
The third layer of protection is a video surveillance system. Drainage Company has installed 300 visual control devices based on the distribution of waterlogging prevention and control points, historical flood cutoff points, and pumping station adjustment pools in the jurisdiction, which can monitor key areas in real time.
According to this triple protection system,
Are Kunming's flood prevention measures in place? Are there any shortcomings in
? Can
withstand the test of flood season in the future?
Recently, Yunnan Radio and Television Station "News Joint Broadcast"
column invited
Chen Huiyang, deputy director of Kunming Water Conservancy Bureau,
Zhao Sidong, deputy general manager of Kunming Drainage Facilities Management Co., Ltd.
, to talk about how to keep Spring City away from waterlogging. .
Q:
What is the current situation of flooded spots in the city?
Chen Huiyang, deputy director of the Kunming Municipal Water Affairs Bureau : "On July 19, 2017, 86 spots were flooded, and on July 19, 2019, 68 spots were flooded. This year, we have dealt with several extreme weather or heavy rainstorms. We have now counted 63 waterlogging points. This should be a decrease in terms of the number of waterlogging points.
Another aspect is our disposal efficiency. It has also been greatly improved. For example, the time when we are flooded has been shortened through various measures. In the past, it might take three hours or more for the water to subside on Phuket Road. Now it is basically the same rainfall. We can compress the time, and the water withdrawal time can be compressed, so the water flooding points have improved.
In the next step, the city is also planning to combine rainwater and sewage diversion improvements and engineering measures to increase the management of water flooding points. , We are planning to implement the renovation of 40 waterlogging points this year. According to our "Three-year Action Plan for Comprehensive Improvement of Kunming's Urban Flood Control and Drainage System" , we will continue to implement some projects next year and the next year. (I believe) the problem of waterlogging in our city will be The flooded spots may be greatly improved.”
Q:
Like some more stubborn flooded spots, such as the flooded spot on Haiyuan Road during the college entrance examination this year, are there any specific solutions?
Chen Huiyang, deputy director of the Kunming Municipal Water Affairs Bureau: " Haiyuan Road actually involves a systemic problem in the Western District. Short-term heavy rainfall in the Western District. The small rivers in the west and the old and new Yunliang Rivers all collect water into the rivers, and the water level is If the embankment rises rapidly, it is easy to overflow. If the embankment overflows, these linear water-logged spots will appear next to it. "
Zhao Sidong, deputy general manager of Kunming Drainage Facilities Management Co., Ltd. : "This year, due to the strengthening of emergency response. To build the discharge capacity, a temporary pumping station was added to the river north of Renmin Road, and four 3,200-square-meter sets of equipment were deployed nearby for emergency response. In addition, the Shanshan rainwater and flood facilities, Shipen Temple and Qiongzhu Temple were installed nearby. These two systems are basically completed. In this case, the time of flooding is greatly shortened compared with previous years.
Especially on the day before this year’s college entrance examination, the rainfall on that day reached nearly 200 mm. , but we basically eliminated the flooding situation before 7 o'clock in the morning, and it did not affect the normal progress of the college entrance examination in that area.
Since there are problems with our facilities and capabilities, the city is already considering whether we can take the next step. Then conduct corresponding research and thinking from the perspective of increasing capabilities. In fact, this point is also listed as one of the 40 points to be solved in the next 3 to 5 years. But its difficulty is how to increase it in the urban core area. The capacity of drainage facilities and rivers is a very big proposition, but we are already considering it.” ?
Zhao Sidong, deputy general manager of Kunming Drainage Facilities Management Co., Ltd.: "First of all, we are responsible for the normal operation of the more than 100 pumping stations under our jurisdiction, and the operation and scheduling of 19 regulating tanks and gates. Currently, there are 204 in the city Key fortification points that are prone to flooding and waterlogging may not necessarily be flooded with water, but we must focus on fortification. Our company is responsible for a total of 101. These 101 are actually main municipal roads, important traffic nodes and underpasses. area, it is necessary to ensure that emergency rescue work is carried out in a timely manner after problems occur at these points."
Q:
Has the triple protection system been built in Kunming now?
Zhao Sidong, deputy general manager of Kunming Drainage Facilities Management Co., Ltd.: "The first meteorological system has basically been built, and it can be updated slightly every year. .
As for the second liquid level system, our backbone system has been laid out, and it is likely that it will increase by about half in the next 2 to 3 years, and will continue to increase, making it more systematic and more efficient according to the situation of the points. In order to be more precise and more widely distributed, we strive to form a dynamic system rather than a single-point system.
We have just started the third video system, because it is difficult to build a video system, and we currently have other video systems as auxiliary, including the traffic police system. For spots prone to flooding, we will deploy our own system, this is a mutually reinforcing system. "
Q:
There is an idea for dealing with flooded spots, which is "one point, one strategy". Can you explain it in detail?
Chen Huiyang, deputy director of Kunming Water Conservancy Bureau: "'One point, one strategy' for flooded spots is actually Considered from two aspects, one is engineering control measures. For each waterlogging point, we comprehensively analyze the causes of waterlogging points. Some are through the transformation of underground pipe networks, some are added drainage channels, and some are It is also adding forced discharge facilities and so on. Anyway, the situation of water flooding varies, and the problem of water flooding can be solved through "one point, one strategy" of engineering measures.
For each point, we formulate some plans for water-logged points from the perspective of emergency response through forced drainage preparation, arrival of personnel and materials, increased drainage capacity, etc. In fact, it has achieved some benefits from two aspects. However, when encountering heavy rainfall, especially heavy rainstorms, some system improvements are still needed to fundamentally solve the problem of waterlogging points.
html It rained heavily on August 9, and the pedestrian underpass at the intersection of Weather Road and Second Ring South Road was flooded again. The property rights of this underpass belong to Kunming Railway Bureau , and the "management rights" were handed over to the Xishan District Government in 2020. Citizens hope that the flooding problem at this point can be completely resolved as soon as possible. Similar underpass tunnels were flooded with water, leaving the staff of the drainage company helpless.
Wang Jianfeng, deputy manager of the Information Technology Service Center of Kunming Drainage Company : "In some communities, no one tells you about the mixed connection, so they connect their drainage pipe network to your underpass connection pipe, causing water under the underpass. It rises so fast that you don’t even have time to pump. This is why the tunnel (tunnel) is flooded with water. It has withstood too much external water. "
At the moment, the flood season is not over yet, and the water is still flooding. If it happens, is the drainage pipe not thick enough? Not draining fast enough?
Wang Jianfeng, deputy manager of the Information Technology Service Center of Kunming Drainage Company: "Our pipes do not have so much space for water to be discharged. In this case, it is very easy for water accumulation to occur, so sometimes we see a There may not be extreme heavy rains during the rain, but a long period of rain will also bring accumulation of water. The reason is here. "
Wang Jianfeng said that with the expansion of urban construction, the urban population continues to increase. The original urban flood channels are no longer enough. In this case, "deep" may be a better solution.
Wang Jianfeng, deputy manager of Kunming Drainage Company Information Technology Service Center : "The normal situation is about five meters of burial depth, that is, it is buried five meters underground. Our concept of depth is that the space is not occupied in the lower layer of 30 meters or even deeper. A large tunnel is built in the place to collect the rainwater facing the mountain into the depth, and then it is discharged through the pump station to other areas. The drainage pipe network of the community is privately connected to the underpass. In the channel, do I need approval to connect this pipe?
Chen Huiyang, deputy director of the Kunming Municipal Water Affairs Bureau: "All drainage pipe networks connected to pipes need to be approved by the city's drainage management department. Kunming City is undergoing renovation of the rainwater and sewage diversion of the underground pipe network. This year, all underground pipes will be inspected. The network forms a picture, and we are also investigating the underground pipe network. It should not be common for the drainage pipe network of the community to be connected to the underground channel privately. If our drainage department strengthens management, this situation can be eliminated. .”
Q:
There are many mountains around Kunming. How much does flooding have to do with flash floods? Can some targeted measures be taken?
Chen Huiyang, deputy director of the Kunming Municipal Water Affairs Bureau: "The topography of Kunming is surrounded by mountains on three sides and facing the Dianchi Lake. The main urban area is flat. When there are heavy rains, mountain floods will enter the city, affecting the city's underground pipe network and rivers. It has a great impact, so the impact of mountain floods on urban flood control is still relatively large. Because in response to this situation, we organized the system in 2017 and basically established 'lower discharge, middle dredging, upper interception, and high storage'. Such an urban flood control management system is an important measure we have taken to deal with floods in the opposite mountains. Since 2018, we have implemented Changchong Mountain , Shipen Temple, Chunyulu Mountain, Paoma Mountain, etc. Judging from the implementation effects of the twelve mountain-facing flood interception projects, we try to keep the mountain floods on the mountains, which also plays the role of detention, peak shifting, and regulation. Such The concept of sponge city . "
Q::
Can Kunming's drainage pipe network facilities and triple protection system prevent extreme weather, for example, if the rainfall in 24 hours exceeds 100 mm, 200 mm, or even higher? ?
Zhao Sidong, deputy general manager of Kunming Drainage Facilities Management Co., Ltd.: "Because excessive rainfall is an objective fact, so based on this situation, we will base on the bottom line awareness, that is, try to fight for people's lives. Property safety will not be damaged, so at this time we have to cut off diplomatic relations and transfer accordingly, including some shutdowns at the government level, the suspension of rail facilities, etc., which are all measures that should or are necessary. "
Q:
Under what circumstances should the bus and subway shutdown mechanism be activated?
Chen Huiyang, deputy director of the Kunming Municipal Water Conservancy Bureau: "For example, for the rail subway, rainfall is one of the indicators for its safe operation. There are also several indicators. It will activate different levels of response mechanisms based on other deep things. Once conditions If it has it, it will trigger its response mechanism, and then take corresponding measures. For example, if it needs to be shut down, it will shut down in time. If it needs to be encrypted, it will be encrypted and operated in time."
Q:
The flood season in Kunming is actually quite long. There is a saying of "seven down and eight up". Will there be heavy rainstorms in Kunming next?
Chen Huiyang, Deputy Director of Kunming Water Conservancy Bureau: "Because we have The flood season is from May to October, and the flood season is relatively long. This is the critical period. Heavy rains and single-point rainstorms are more likely to occur frequently from late July to early August, so the pressure during this critical period will be greater. From the perspective of Kunming, August and September, especially September and October, belong to the post-flood season. "
Zhao Sidong, deputy general manager of Kunming Drainage Facilities Management Co., Ltd. : "The probability of heavy rainfall in late August and September is very high, especially around September 10th and early September. In previous years, there is a high probability of heavy rainfall. A large-scale rainfall occurred, so we still did not relax our vigilance. We also strengthened two plans in the entire flood control plan system, including the improvement of the track plan and the improvement of the construction site plan, and then also included the bridge and tunnel company, which is us Improvement of flood prevention plans for the second ring road and above. Through the improvement of these plans, we will improve our entire flood control system in Kunming. "
Q:
The research on the deep tunnel drainage system in the main urban area of ​​Kunming is already open for bidding. Does this mean that it is not far away from implementation? How difficult is it?
Chen Huiyang, deputy director of the Kunming Water Conservancy Bureau: "Because of the deep tunnel drainage system There are also some projects implemented abroad, including in China. For Kunming, especially in the main urban area of ​​Kunming, it is very difficult for us to find space for its flood channel. As for the problem of insufficient flood control capacity, I think it would be better to solve it through depth. I think this is also more timely for in-depth systematic research. The next step is to study the situation, because it is also more complicated, it is 30 meters underground, there are geological conditions and other conditions. I think a conclusion may be drawn through profound and systematic research. When? What scale to achieve and so on may depend on the research situation. "
Zhao Sidong, deputy general manager of Kunming Drainage Facilities Management Co., Ltd. : "Why is the deep tunnel proposed? In fact, it is used to solve the problem. Now that we have discovered the problem, we are ready to solve it.
The main contradiction we face in the main city is the pressure to implement expansion. Now it is an urban area and there is no room for expansion. So if we couldn’t do things on a flat surface, we expanded our thinking and learned from the experience of other cities to see if we could solve this problem at a deeper level by skipping the shallow layer.
Of course, this has just started in the country. A deep tunnel in Wuhan is officially put into operation. Others, including Guangzhou and Shanghai, are still doing experimental sections and running experimental sections. Now let’s talk about why Deep Tunnel emphasizes startup. It is research. Once the research is feasible, it will be pushed down. But it also has weaknesses, that is, its energy consumption, the scale of its construction investment, etc. will be larger than conventional projects, so it is mentioned that research is done first. After the research is mature, one will be matured and the other will be implemented. "
Chen Huiyang, deputy director of the Kunming Municipal Water Conservancy Bureau: "Because the rivers in the main city basically run from north to south, but road traffic and railways run east-west, so bridges, culverts, main water and rivers need to be widened and flood discharges increased. In fact, there is basically no space for passages, especially railways and roads, which have bridges and culverts with main water, and there is no solution. In fact, space is very difficult, so I think it would be very good from this perspective to study deep tunnels to increase flood control capabilities. If further research can be carried out, our drainage channels will be greatly improved.”
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