From Propulsion City To Multiverse

Datang tried his best to launch the westward expedition.

And the People's Revolutionary Federation is cleaning up the mess.

Wagang Army and Youzhou Army created as many as 6.47 million victims.

In addition, there are 3.26 million people on the Young Marshal's site, 4.83 million people on the Xia Kingdom site, 260,000 people on Yuwenhua and the site, and 550,000 people on the Wang Shichong site.

The total population is 15.94 million, and there are many people who have fled to the mountains and forests and are hiding.

Fortunately, this year, Guangnan, Lingnan, Southeast, Liuqiu and Jiangdong have had bumper harvests, and grain companies have stockpiled 5.37 million tons of grain.

And Xia Guo and the Young Marshal's army also left behind a lot of food and supplies, which the People's Revolutionary Federation of more than 6 million victims could still bear.

After the construction of the Hunan-Guangxi Lingqu Canal, the Jiangxi-Guangdong Canal, and the Zhejiang-Jiangxi Canal, the Pearl River Basin, the Yangtze River Basin, the Huai River Basin, and the Yellow River Basin were completely connected.

At present, the smallest ships passing through the canals and rivers have reached the 100-ton level. In the classical era, this was the general existence of super railways.

After all, in an area with flat terrain, the warhorse can only advance 70 to 80 kilometers a day. If it is forced to march, it can barely reach 170 to 180 kilometers per day, but it is difficult to maintain it for three days.

In the case of smooth wind and water, the speed of the canal can reach 7 to 10 knots, and it can walk about 140 to 220 kilometers a day.

Even if it is against the wind and the current, it can barely reach 3 to 5 knots.

What's more, with the popularity of steam ships, the transportation speed of the canal is gradually improving.

Compared with carriages that can only transport 2.5 to 3 tons at most, the inland river cement ships with huge displacement can transport hundreds of tons at a time. Even a cement ship with a displacement of 100 tons has a load capacity of about 70 tons.

Therefore, the construction of canals in ancient times was not a great achievement, but a very necessary strategy, especially for the Jianghuai and Jiangnan areas where the water network was dense, and it was a weapon to enhance governance.

Facing the refugees from all over the north, Baiyulou quickly mobilized hundreds of thousands of tons of food and carried out a large number of projects, among which the dredging of the Grand Canal was the core project.

It's just that Baiyulou stood on Luoyang City, Song Que and the others looked at the mighty water of the Yellow River, but fell into contemplation.

The Yellow River, the mother river, is not a gentle old mother, but a shrew with an unpredictable temper.

Compared with Song Que and others, Bai Yulou understands the violent temper of the Yellow River better. The current course of the Yellow River was dredged during the Western Han Dynasty.

But with the passage of time, the sediment in the Yellow River channel kept silting up, and the above-ground river downstream has become very obvious.

The situation of the above-ground river can easily lead to the rupture of the river bank.

Especially during the period of communication between the Sui and Tang Dynasties, the government basically lost the ability to maintain the river, and the flooding of the Yellow River became more and more serious.

After all, "two breaking points in three years, and one change in a hundred years" is no joke.

Tang Feilin, who hurried over by airship from Jiangnan, had already come up with a plan to manage the Yellow River.

Tang Feilin brought everyone to the huge sand table room.

"To cure the Yellow River, there is only one plan, diverting the route, returning farmland, and building lakes."

He pointed to the mouth of the Yellow River from Luoyang to Bohai Bay, and then to the middle and northern sections of the Grand Canal in the Sui Dynasty.

Pick up the flag and plant it in the Douzi Lake between Juyeze in Lu County, Daluze in Qinghe County, Pingyuan County and Bohai County.

This is the great lake of the North China Plain in this era.

Among them, Continental Lake has an area of ​​about 900 square kilometers, Douzi Lake is almost 900 square kilometers, and Juyeze has an area of ​​about 1,500 square kilometers.

The existence of these lakes is crucial to the ecology of the lower Yellow River and the North China Plain.

"Returning farmland to lakes can only prevent the accelerated shrinking of the lake surface, but the sediment in the middle reaches of the Yellow River is the big trouble." Bai Yulou reminded.

Tang Feilin naturally knew the key: "This is the diversion part of my plan."

He turned his attention to the zigzag-shaped area in the middle and upper reaches of the Yellow River, and from the middle of the Yinshan Mountains on the sand table, drew a river channel to the north.

Song Que asked in surprise: "Is there really such a huge gap in the middle of Yin Mountain?"

Tang Feilin nodded: "Yes, Yinshan is divided into Dongyin Mountain and Xiyin Mountain (Wolf Mountain), and there is a valley with gentle terrain in the middle, with a width of 18 to 30 kilometers from east to west, and a length of 40 to 45 kilometers from north to south, with an average of 1000 to 1500 meters. , at the same level as the Yellow River in the Hetao Plain."

"I plan to dig a guide channel, and then use the flooding of the Yellow River to block the Yellow River's channel, so that the water level of the Hetao Plain will rise, and then rush the river northward to divert the Yellow River into the desert."

It was only at this time that Song Que discovered that there were actually a series of lowlands in the desert between Monan and Mobei.

"The average altitude of the Hanhai lowland is about 500 to 1000 meters, which is several hundred meters lower than the Hetao Plain, and it is only 150 to 160 kilometers away from the Hetao channel of the Yellow River. As long as a river rushes out, the water in the upper reaches of the Yellow River can be diverted. Part of it goes to the vast sea."

Song Que was still a little worried: "The Tang Department, the Yellow River is diverted from the upper reaches, will there be a shortage of water in the middle and lower reaches?"

"That's the second part of my plan, building the lake."

Tang Feilin pointed to Qin and Jin. The Yellow River bisected the two places from the middle. This is also the area with the most serious soil erosion on the Yellow River.

"On the high loess slopes in Qin land, dams are built to intercept the river water that enters the Yellow River, and then the entire high loess slopes will be returned to forests and grasslands. Only forest farms and pastures will be used here, and farming activities will be reduced."

"And the old Yellow River in the Qin-Jin section was transformed into a stepped reservoir, which is no longer used as a regular river. Only the Weihe and Fenhe rivers are left in the lower reaches of the Yellow River as the upstream, and the Qin-Jin stepped reservoir is only used for seasonal water volume regulation."

"In this way, without the sediment input from the Qin and Jin lands, the sediment content in the lower reaches of the Yellow River will decrease rapidly, and then choose low-lying areas on the lower plains as flood discharge lakes. Most of the water in the lower Yellow River is left behind."

Obviously this plan is crazy.

It is simply to dismember the Yellow River, and the upper, middle and lower reaches are all separated.

Of course, judging from the current flow of the Yellow River, this project is still feasible.

If it is the situation of water shortage everywhere in later generations, let alone diverting the route to Monan, there will be insufficient water everywhere along the way.

During the Sui and Tang Dynasties, the annual flow of the Yellow River was about 80 to 100 billion cubic meters, and the upstream interception was about 20 billion cubic meters; the middle reaches of the Qin and Jin Dynasties intercepted about 20 billion cubic meters; the downstream still had 40 to 60 billion cubic meters.

Then, through a large number of lake areas, 30 billion cubic meters of water will be left in the Guanzhong Plain and the North China Plain, and the rest will flow into the Bohai Sea.

Due to the closure of the upper and middle reaches, the sediment content of the downstream rivers is reduced. In this way, the above-ground rivers can be contained, and the rate of filling up the Bohai Sea will be slowed down by dozens of times.

Moreover, the existence of the Qin and Jin stepped reservoirs is not only beneficial to the coastal areas of the Qin and Jin Dynasties, but also can be used to alleviate the water shortage in the upstream and downstream.

If there is a surge in rainfall downstream due to extreme weather, it can also be adjusted through various parts.

According to Tang Feilin's design, the existence of the Qin-Jin Step Reservoir is the core of regulating the entire watershed. Whether it is blocking water into the desert or releasing water southward, it is very important.

"By the way, this project is a lifetime series, right?" Bai Yulou complained.

Tang Feilin shrugged: "No, because the Ladder Reservoir is the last one to be built, neither the Great Lakes Plan in the first stage nor the North Entry Plan in the second stage need to build large dams, only in the Ladder Plan in the third stage. Build a series of dams."

Bai Yulou picked up another plan and said with cold sweat on his forehead:

"But what the **** is this Vast Sea Project?"

Tang Feilin waved his hand indifferently: "It will be used in the future. After all, the annual flow of black water is 300-400 billion cubic meters, which is equivalent to 3-5 Yellow Rivers. I plan to intercept part of it and use it to build the Hanhai Canal."

From the topographical point of view, UU reading www. uukanshu. The Hanhai lowland and the Hulunbuir prairie in the upper reaches of the Black Water are at the same altitude, and there is indeed the possibility of introducing the black into the desert.

It's just that the amount of work is a little touching!

Bai Yulou has not had time to complain.

Tang Feilin continued to talk to himself again, as if he was planning to introduce part of the Beihai Lake on Xianbeilia into the black water, and then increase the water volume upstream of the black water.

On the side Song Que, the whole person is going to be stupid.

He was still sighing at the unrestrainedness of the Yellow River plan just now, but now it seems that he underestimated Tang Feilin's brain opening.

Song Que also thought of Li Tang, who was still entrenched in Guanzhong at this time, and the eastern people in Mobei. Obviously, Tang Feilin and others did not take these forces in their eyes, and even the planning map came out directly.

However, Tang Feilin's initial plan for the Great Lakes was not difficult. After all, as long as the farmland was abandoned and relocated, the Yellow River could be used for infusion. These lakes are still very easy to transform.