When Han Xin and Xu Maogong took all the lost land back, it was already close to midsummer.

The weather in Chang'an City is very hot, and it has not rained for more than ten days.

Crops outside Chang'an are even more prevented from growing because of drought.

Early that day, an official brought up the matter.

"Holy Lord, there is a great drought outside Chang'an City, and the imperial court must find a way to solve it as soon as possible."

After this official said it, other officials jumped out on his heel.

"Holy Lord, if the drought cannot be solved, the grain income of our Tang Kingdom will definitely decrease this year, although it will not affect anything, but if we want to start another war, I am afraid it will not work."

"Yes, Holy Lord, the drought must be solved, and the ministers are asking for rain in the Temple of Heaven."

"The minister also proposed to ask for rain at the Temple of Heaven......"

Many officials have suggested asking for rain, which is their usual method, but whenever some natural and man-made disasters occur, they ask for rain.

However, Li Yu did not think that praying for rain was useful.

In many cases, if human beings want to survive, they have to overcome those natural disasters through their own efforts.

Li Yu didn't think it was useful to ask for rain, but in the face of the discussion of the ministers, he still nodded: "Okay, order someone to ask for rain in the Temple of Heaven." ”

It is useless to ask for rain, but there is no problem in appeasing people's hearts, and in the face of the panicked and anxious people, the court begging for rain can give them more hope in their hearts.

The face project is to be done, but Tang Yu will not pin all his hopes on praying for rain.

After he had said this, he said, "In addition to asking for rain, I have also made a waterwheel and sent people to make it in large quantities, and then brought the surrounding water into the fields, so that this year's harvest can be ensured." ”

The waterwheel is also available at this time, but Li Yu's waterwheel is a little more advanced, and it can rotate automatically with the help of the wind, so that it can save manpower and operate non-stop, so that the fields outside Chang'an can be irrigated smoothly.

Li Yu handed over the waterwheel to the Ministry of Industry, which began to manufacture a large number of products according to the design drawings.

After this is manufactured, it is immediately put into use.

The waterwheel began to operate and began to water the crops outside the city of Chang'an.

There are also people who ask for rain, but the weather in Chang'an City is still very dry, and there is no rain to come.

For a month, there was no rain in Chang'an, but in this month, the use of waterwheels has also alleviated a lot of drought, and many people's crops have been rescued, and the growth is still very good.

And just a month later, a thunderclap suddenly sounded over Chang'an City, followed by heavy rain.

Heavy rain poured down.

The people of Chang'an City have been looking forward to the rain for a long time, and now that it is finally raining, they all ran out of their homes excitedly.

Heavy rain and strong wind, everyone was very comfortable.

"Good rain, good rain."

"This rain is coming, it's coming, it's coming."

"I think the holy waterwheel has played a big role, otherwise how could our crops wait for the heavy rain?"

"Yes, yes, the holy waterwheel is indeed very powerful, so that our crops can alleviate the drought, so that our crops have a chance to wait for the heavy rain."

"Long live the Holy One......

"Long live the Holy One......

The people shouted and were excited, and at this time, inside the palace, Li Yu was discussing things with his ministers.

"Ladies and gentlemen, although it is raining now, it is not a way to rely on the sky to eat like this, do you have any good suggestions to solve this problem once and for all?"

The common people have always relied on the sky for food, but in this case, it is too unstable, and instability is prone to chaos for the Tang Kingdom.

If we can keep the people's crops from running out of water, then many things will naturally be much easier. Li Yu asked, the ministers looked at each other, at this time, Yuan Tiangang stood up and said: "Shengshang, if you want to solve this problem, it's simple, we can dig a grand canal, in this way, once there is a drought, you only need to open the gate to release water, and when there is a lot of water, you can also store water, so that my crops in Datang will never be short of water, and they will not be flooded." ”

Yuan Tiangang has studied this aspect, and he said that after the canal was dug up, many officials in the DPRK and China were very interested.

"Yuan Tianshi, you said you were going to dig the canal, but I don't know how?"

"yes, from there, and there, how to open?"

"That's it, it's ......"

Everyone asked, and Li Yu also asked curiously: "Yuan Aiqing, tell me your idea." ”

Digging a canal is not a trivial matter, and sometimes the economic pressure is not easy to solve, so although Yuan Tiangang put forward the idea of digging a canal, he must also understand the specific situation. In the face of this situation, Yuan Tiangang did not hesitate, and said directly: "Shengshang, now there are five major water systems in China, namely the Haihe River, the Yellow River, the Huai River, the Yangtze River, and the Qiantang River. ”

After Yuan Tiangang said this, everyone couldn't help but smack their tongues a little.

"Yuan Tianshi is really bold, he actually wants to open up all the five major water systems, do you know how many years it will take to open up these five major water systems, and how much money will be needed?"

"Hehe, Yuan Tianshi's idea is good, but it's a pity that it can't be implemented."

"That's right, that's right, the Qiantang River is in the territory of the Song Kingdom, and it's not easy for us to get through, right?"

"It costs money, effort, and people, if it really gets through, my entire Tang Kingdom will be emptied, it's not feasible, it's not feasible."

“…………”

The ministers of the court were originally very curious, but after hearing Yuan Tiangang's idea, they all expressed their opposition, because if this canal was dug up, it would be too laborious and costly, and although their Tang Kingdom was rich, they were afraid that they would not be able to support such a big project.

When the ministers objected like this, Li Yu also took a breath of cold air, because he soon discovered that the canal Yuan Tiangang said was the Beijing-Hangzhou Grand Canal in the space where he was in his previous life, and the Beijing-Hangzhou Grand Canal was dug by Emperor Yang of Sui.

In order to dig the Beijing-Hangzhou Grand Canal, Emperor Yang of the Sui Dynasty can be said to be very laborious and wealthy, so that the people were miserable, and finally they could only rise up and die in the Sui Dynasty.

If he Tang Guo did this, would he repeat the mistakes of the previous time and space? This is a very tangled thing, and I can't even think about it, Li Yu's eyebrows condensed slightly.