On the afternoon of July 20, 2021, a particularly heavy rainstorm fell in Zhengzhou City, Henan Province, which may be a super heavy rainstorm that has not been encountered in a thousand years, and this heavy rain has caused significant property losses to Zhengzhou City, and also tested the drainage projects in Zhengzhou City. However, many people's questions and some new terms on the Internet have caught my attention, such as the Jialu River, Changzhuang Reservoir, Jiangang Reservoir and other water conservancy projects and rivers that were not known before. There are also some netizens' questions, such as whether the water in Zhengzhou City is drained from the Yellow River? There is also a question of whether there is water from the reservoir flowing into the city on the afternoon of July 20.
The water in Zhengzhou city ended up flowing out of Baisha Town
It can be seen through the topographic map that the city of Zhengzhou is really not conducive to rainy drainage, the southwest and west of Zhengzhou are hilly and mountainous, the water flows to a low place, and on the afternoon of July 20, it is raining heavily around Zhengzhou, so the rain in the southwest direction of Zhengzhou and the rain in xingyang in the west are flowing along the river in the direction of Zhengzhou. The southwest direction is mainly the Eighteen-Mile River and the Seven-Mile River, and the western river is mainly the Jialu River and a river originating from the Tanggang Reservoir.
The rivers of Zhengzhou flow from the southwest and west to the east
Due to the high terrain in the southwest and west of Zhengzhou City, the Jialu River, which originates from the Changzhuang Reservoir and the Jiangang Reservoir, first flows north along the West Third Ring Road, and this section of the West Third Ring Road is also called Xiliu Lake, until the intersection of Lianhuo Expressway and Jiangshan Road begins to flow east, all the way through the north of Zhengdong New District, and then to the southeast, after the intersection of Baisha Town and Dongfeng Canal, it flows southeast to Weishi County and Zhoukou City, and finally into the Huai River. It can be said that the Jialu River almost surrounds the entire city of Zhengzhou, originating from the southwest of Zhengzhou City, and after a week of circling the west and north, it flows southeast.
Topographic topography of Zhengzhou City, southwest and west high north of the Yellow River is also high
On the outskirts of the Jialu River, there is Xingyang, and there is the Dingdian Reservoir and the Wei River in Xingyang, and there is a Tanggang Reservoir in the north of Xingyang, and these rivers also flow into the Jialu River. Due to the high terrain in the southwest and west of Zhengzhou, the rivers pass through Zhengzhou to the east and finally join the Jialu River, which shows that the drainage pressure of Zhengzhou is relatively large.
Distribution and flow direction of rivers in Zhengzhou
Others say that Zhengzhou can be drained through the Yellow River? Many people think that Zhengzhou City is next to the Yellow River, and the water of Zhengzhou City will flow into the Yellow River, in fact, the Yellow River is an above-ground hanging river, about 7 meters above the ground level, and the surface water cannot flow into the Yellow River.
Therefore, the southwest and west of Zhengzhou City are surrounded by hills, and the Yellow River in the north is 7 meters above the ground, and the entire Zhengzhou City has become a semi-closed arc, opening in the east of Baisha Town. So the amount of rain generated by the exceptionally heavy rain on the afternoon of July 20, 2021, can only flow eastward through the opening of the eastern town of Baisha, and it is conceivable how much pressure the drainage and discharge is in this situation.