Brief introduction of main canal of Chuhe River

Hefei is located in the Jianghuai hilly area, with high central part and easy water shortage. Both sides are low-lying and easily flooded. This is the reason for frequent droughts and floods in Hefei. The traces of drought left by old China in Hefei are not only common in old chronicles, but also some existing place names such as Huolonggang, Shaijiang, Shaomaigang and Hongmaochong are all evidences left by the drought history.

In the 52 years since the founding of the People's Republic of China, Hefei has suffered from drought 42 times, almost once a year. The completion of the main canal of the Chuhe River has completely solved the depression of bare land in the past ten years. Hundreds of thousands of acres of barren wasteland and barren hills have become fertile fields for drought and flood. The grain yield per mu increased from 150 kg before the main canal was built to over 500 kg. Since the operation of the main canal for more than 30 years, the agriculture in the irrigation area has increased year by year. Even in the once-in-a-century drought in 2000, the agriculture in Chuhe main canal irrigation area still achieved a large-scale harvest in many areas around Hefei.

Hefei has a special climate, which belongs to monsoon subtropical humid climate. Southeast subtropical high and northwest cold air often meet here, and unexpected disaster weather often occurs. The average annual rainfall in this area is about 900 mm, but it is unevenly distributed, mostly concentrated in June, July and August, and sometimes floods occur.

Hefei is one of the 3 1 key flood control cities in China. The bottom of the main canal of Chuhe River is more than 30 meters higher than the city center, and it spans the provincial capital Hefei in a fan shape, which is the first natural barrier for flood control in Hefei. There are six small and medium-sized detention reservoirs in the irrigation area, with a catchment area of 142. 1 km2 (calculated from Sishui Reservoir 4 1 km2), accounting for 23.5% of the total water area of 606 km2 above Shouchun Road and Bridge in the urban area. Coupled with the lateral catchment area of the Chuhe main canal and the flood detention capacity of the canal, the flood control capacity of the Chuhe main canal is equivalent to that of Dongpu and Dafangying reservoirs, which can be said to be the three Taoyuan brothers on the flood control front in Hefei. The main canal of Chuhe River is an indispensable general in Hefei flood control game. After the completion of Dafangying Reservoir, with the joint efforts of the three brothers, the flood control capacity of Hefei can be improved from once in 20 years to once in 100.

199 1 During the flood season, the reservoirs of Daguantun, Caitang, Zhang Qiao and Santousi, the main canal of Chuhe River, held back 7.8 million cubic meters of flood in mid-June, reducing the peak flow by 43%. According to the weather forecast, in order to alleviate the threat of rainstorm, from June 27th to July 8th, the storage capacity of the above four anti-regulation reservoirs was 410.4 million cubic meters, and the water level decreased by 0. 19 m on average. During the subsequent rainstorm, the main canal and four reservoirs held back 7 1.58 million cubic meters of flood from June 7 to July 5. On July 9th, the maximum inflow peak flow reached 45 1.2m 3/s, and the outflow flow of the reservoir after flood detention was only 96.5m3/s, which reduced the flood peak by 78.6%. The main canal of Chuhe River has made outstanding contributions to urban flood control and disaster reduction in Hefei 199 1.

More than two-thirds of the more than 600 cities in China are short of water, and the per capita water resources in our province are only half that of the whole country. Hefei is located in the Jianghuai hilly area, and there is a serious shortage of high-quality water resources. Chaohu Lake, the fifth largest freshwater lake in China, is near us. Although water resources are abundant, a large number of domestic wastewater, human and animal excrement, domestic garbage, pesticides, fertilizer residues and untreated industrial waste liquid have flooded into Chaohu Lake, making Chaohu Lake the most polluted inland lake in China. Hefei's high-quality water resources are increasingly scarce, and urban water supply has to rely on foreign aid.

Influence of Chuhe main canal

The main canal of Chuhe River 1958 was started, and the upper section of 1966 was flooded for the first time. At that time, Dongpu Reservoir was required to store water15.75 million cubic meters, which opened the prelude to Hefei's introduction of external water, and it was out of control from then on. Thousands of miles away, Dabie Mountain water rushed to Hefei with a smile, raising generations of hardworking and kind Hefei people.

From 1999 to 200 1, Hefei suffered from drought for two consecutive years. However, Hefei citizens are not short of water, and there is still an adequate supply of high-quality drinking water. If there is no Chuhe River as a water diversion channel, the result will be unimaginable. In the past three years, the main canal of Chuhe River has attracted 360 million cubic meters of high-quality drinking water for Hefei from the upstream.

With the development of Hefei's modern metropolis construction, the contradiction of insufficient high-quality water resources in Hefei has become increasingly prominent. After the completion of Dafangying Reservoir, it can basically meet the shortage of high-quality fresh water in Hefei area through joint operation with Chuhe main canal and Dongpu Reservoir. It is planned that by 20 10, the main canal of Chuhe River will attract more than 200 million cubic meters of high-quality fresh water to Hefei, benefiting more than 2 million people and enjoying high-quality water resources.

Along the main canal of Chuhe River, there are mountains and peaks, water and pearls, lush trees and flowers. If two sister reservoirs, Dongpu and Dafangying, are two bright pearls in Hefei, then the main canal of Chuhe River is a beautiful jade necklace that connects them together. Small and medium-sized reservoirs around the main canal are crystal clear sapphires on necklaces, dotted with ditches and streams in the fields, conveying her blood, and weaving the three counties and four districts of Hefei into a spiritual green garden.

Spring in Dabie Mountain is singing loudly, and the fish in Daguantang are cheering. We warmly welcome friends at home and abroad to visit and invest in new business here. After work, you can also enjoy simplicity, green, sunshine and oxygen, and enjoy the grace of nature to create a better tomorrow!