After the South-to-North Water Transfer Project, how much does Danjiang still flow south?

□ Reporter Zhang Wei Intern Jiao Chunyangwen Chief reporter Chen Xiaodong Photography

Reading Tips | Yesterday, the main canal of the south section of the Yellow River in the first phase of the Middle Route of South-to-North Water Transfer Project started in water filling test for the first time. At 10: 58 in the morning, the gate of Taocha Hub in Xichuan County, Nanyang was slowly opened, and the Danjiang River flowed into the central main canal for the first time. The first test of "South Water" will comprehensively test the physical quality and safety of the project south of the Yellow River. After the flood season this year, Danjiang River will once again gush out from the first sluice of Taocha Canal, go south along the southwest of Henan, cross the Yellow River, continue north along the west side of Beijing-Guangzhou Railway, meander through 1277 km, and finally reach Beijing.

In a few months, tens of millions of people in Beijing, Tianjin, Hebei, Henan and other four provinces and cities 19 large and medium-sized cities and 100 counties and cities will drink the "water in the middle line", and the water transfer will enter the countdown. Is the water clear? With the issues that people along the route are most concerned about, Dahe Daily reporter visited.

On-site: Danjiang enters the main canal of the central line first.

After ten years, Danjiang finally flows into the "embrace" of the main canal of the middle route of South-to-North Water Transfer Project. Yesterday morning, when the clear water flowed out of the gate of Taocha Hub, everyone present clapped their hands: "Long time no see!" Because there has been no heavy rain for several days, the water level of Danjiang River has been maintained at around 14 1 m, so the current in water filling test is not large and moves slowly in the channel.

According to reports, the channel of water filling test this time starts from the first hub gate of Taocha Canal in Xichuan County, Nanyang, and ends at the control gate of Xushui River in Zhengzhou City, with a length of about 447 kilometers. The experiment will be carried out by gravity continuous water filling, and the water volume is about 65.438+0.2 billion cubic meters. Just a month ago, the channel in the north section of the Yellow River started in water filling test.

Interpretation: This is how Nanshui entered the household.

Our province is the water source and water receiving area of the Middle Route of South-to-North Water Transfer Project, with the longest channel, the largest investment and the largest water consumption. After water delivery, the annual water distribution in our province reached 3.769 billion cubic meters, accounting for 40% of the total water delivery.

From the central main canal to the water pipes in people's homes, the supporting project will play the role of South-to-North Water Diversion: water will be supplied to 83 water plants in 1 1 provincial cities and 34 counties (cities, districts) through 39 diversion gates, with a total length of about 1000 km and an estimated total investment of1500 million yuan.

Dahe Daily reporter learned through many visits that the process of entering the household with Nanshui is like this: everywhere, it first passes through the head of the water diversion outlet and comes to the pumping station. The incoming water is pressurized by the pump and "pushed" into the pipeline. After flowing to the surge shaft for "depressurization", it is distributed to various water plants through underground pipe culvert or a few open channels.

According to reports, in order to welcome the south water to households, many places in our province plan to build and expand water plants. After entering the waterworks, Nanshui will go through a strict purification process. Taking Zhengzhou Liuwan Waterworks as an example, South Water will be treated by ozone contact tank, mechanical accelerated clarifier, activated carbon adsorption tank, ultrafiltration membrane workshop and other processes, and finally become tap water meeting the national drinking water standards, which will be transported to the municipal large pipe network and enter thousands of households.

Downturn A07 edition