China News Service, July 21. According to the website of the Ministry of Water Resources, the water level of the Changzhuang Reservoir (medium) in Zhengzhou City, Henan Province continues to drop, and the danger has been effectively controlled; after the Guojiazui Reservoir (small) is out of danger, temporary measures will be taken on both sides of the dam. Excavation of diversion ditch to increase flood discharge measures; follow-up will increase the risk observation of the dam body, continue to increase the excavation efforts, increase the discharge volume and reduce the water level.
The news pointed out that due to the recent heavy rainfall, the Yihe River, a tributary of the middle reaches of the Yellow River, the Jialu River, a tributary of the upper reaches of the Shaying River in the middle reaches of the Huai River, and the Dasha River, the Communism Canal, and Weihe River, a tributary of the Zhangwei South Canal in the southern part of the Haihe River, have been flooded. A super-historical flood occurred.
Affected by the water coming from the upstream trunk and tributaries, the Huayuankou Hydrological Station (Zhengzhou, Henan) on the middle reaches of the Yellow River at 1:24 on July 21, the flood peak water level was 91.00 meters, which was lower than the warning water level (92.47 meters), and the corresponding flow was 3650 cubic meters per second.
At 14:00 on July 21, the Dasha River, the Communism Canal, the Wei River, and the Jialu River, a tributary of the Shaying River, on the Zhangwei South Canal exceeded the police by 0.41 to 1.13 meters.
It is expected that there will be heavy rains in some parts of northern Henan in the next three days.
Affected by this, the Zhangwei River in the Haihe River Basin, the Yiluo River and the Qin River in the middle reaches of the Yellow River, and the Hongru River and Shaying River in the Huai River Basin will experience significant water increase processes. The Zhangwei River in the Haihe River Basin may form a numbered flood, and part of the rainstorm area Larger floods may occur in small and medium rivers.
The Ministry of Water Resources upgraded the emergency response from level IV to level III for flood and drought disaster prevention at 2 o'clock on July 21.
The water level of the Changzhuang Reservoir (medium-sized) in Zhengzhou City, Henan Province continued to drop. The water level of the reservoir was 128.06 meters at 14:00, which was 3.25 meters lower than the highest water level (131.31 meters). The danger has been effectively controlled.
After the Guojiazui Reservoir (small) was in danger, temporary diversion trenches were excavated on both sides of the dam to increase the flood discharge. At present, the total discharge flow on both sides is 60 cubic meters per second, and the water level is 1.2 meters below the top of the dam. Digging emergency drainage channels to create conditions to increase the discharge flow; the main leaders of the Provincial Water Resources Department led the technical personnel to direct the rescue on the spot, and a total of 200 rescue officers and soldiers, 5 experts, and 8 excavators were put in.
Follow-up will increase the observation of the dam's danger, continue to increase the excavation, increase the discharge and reduce the water level.