Huang He said: Brother Yangtze River, little brother, I will help you share some of the flood pressure.

In recent years, the Three Gorges of the Yangtze River and the Danjiang Estuary have great flood control pressure during the flood season.

The maximum flood discharge capacity of the flood gate of the Three Gorges Project is 102,500 cubic meters per second, and the normal flood discharge during the flood season is a few tenths of the maximum flood discharge. Usually in twenty or thirty thousand squares.

Since the completion of the Danjiang Estuary, the maximum inflow is 25,000 per second, and the maximum discharge volume is 10,000 cubic meters per second.

If we can divert 1,000 cubic meters of water per second from the Three Gorges to the Danjiang Estuary and the lower reaches of the Han River, and from the Danjiang Estuary to the Yellow River, we can build a 1,000 cubic meters per second flow capacity channel.

Then we will be able to bring more than 20 billion floodwaters to the Yellow River during the flood season.

How much does it cost to realize such a project?

First of all, we need to build a canal from the Danjiang estuary to Lankao on the Yellow River, the normal flow of the canal is 1,000 cubic meters per second, and the design flow is 900 cubic meters per second. The cost of building such a canal is extremely low, flood excavation is used to dredge, and it has a flow capacity of 2,000 cubic meters per second.

The canal runs as follows

How much does it cost to invest in building such a flood channel?

Let's look at the canal, if it were dug in floodwater, the cost would be extremely low, but in order to overestimate the budget. We allocate it according to the cost of 500 million kilometers of the Pinglu Canal. The cost of the construction of the entire canal can be obtained at 350 billion.

The current cannot climb over the mountains. Pumped hydro storage is required. The water diversion route is shown below

Diagram of the water diversion route from the Three Gorges to the Danjiang Estuary

Route description: The water level of the Three Gorges Dam is 175 meters. The water intake of the Danjiangkou Canal is up to 135 meters.

The difference between the two is 35 meters, and the water transfer distance is 200 kilometers. The whole process is artesian, and the Nanhe hydropower station maintains a high level of operation in dry years, which can ensure that the pumped storage efficiency is theoretically greater than 70%.

Water diversion elevation map

We need to build a 6GW pumped storage power station with pumped hydro storage for 12 hours a day and generate electricity for 12 hours. There are 3 pumped storage power stations, each with a 100-meter-high dam.

The pumped energy storage unit has a rated power of 51MW and a water head of 98 meters. The pumping power is 50MW, the water head is 100 meters, and the flow rate is 53 cubic meters per second. Each power station is equipped with 40 units, with an installed capacity of 2GW and a total installed capacity of 6G. The investment needs 40 billion. It is also necessary to expand the scale of the Nanhe power station, and the investment in the pumped storage power station also needs 40 billion yuan.

According to the above estimates, an investment of less than 500 billion yuan can make the Yellow River say: Brother Yangtze River, I will help you share some of the flood pressure.