Soon after returning to the Imperial Palace, Liu Ying really waited for a visit from Shaofu Yangchengyan.

But what is slightly different from Liu Ying's expectation is that Yang Chengyan doesn't seem to have much feeling about everything that happened outside Weiyang Palace this afternoon.

To be precise, Yang Chengyan's attention was attracted by another thing.

"Home!"

After the ceremony, at Liu Ying's invitation, he sat down in the guest hall, and before Liu Ying could speak, he saw Yangcheng Yanhuo hurriedly take out a slightly yellowed burlap from his arms.

After the burlap was spread out by Yang Chengyan, Liu Ying stepped forward to check it, and couldn't help but reveal a strange look.

"Shaofu, ······ this?"

With a puzzled question, Liu Ying couldn't help but lower her head again and looked at the yellowed burlap.

As far as Liu Ying can see, this piece of burlap, which will never be used as an underwear sewn even in the folk, seems to have been used as drawing paper by Yangchengyan.

And on this 'drawing paper', only thumb-thick charcoal was used to replace a similar ······

Sushi stuff?

Seeing Liu Ying looking at the 'drawings' that he had made improvised and showing a slightly confused expression, Yang Chengyan's face suddenly turned red.

But even so, Yang Chengyan's passion that he didn't know where it came from was not extinguished by the doubts on Liu Ying's face.

"This thing······ Uh······"

"Have you ever heard of one of the things used by hydraulic engineers to control rivers and canals, and the name is: Si?"

Hearing Yang Chengyan's words, Liu Ying only repeated in a slightly confused voice, 'Si? The confusion on his face couldn't help but be even worse.

But seeing that Yang Chengyan did not panic at all, his eyebrows fluttered and he described the grand blueprint in his heart.

"At noon, the family said in the western suburbs: pressing a heavy object on the bottom of the canal can prevent the river mud from being washed by water."

"After the dispersal of the dynasty, the minister pondered and meditated, and just remembered this thing, the effect of soil consolidation should be better than stone bricks, and the price is cheap and easy to take!"

Hearing this, Liu Ying's strange face finally eased a little, and with a little curiosity, she stretched out her hand to Yangcheng Yanyi and made a 'please' gesture.

"I want to hear about it."

With Liu Ying's permission, Yang Chengyan pressed the excitement in his heart for a while, and explained to Liu Ying little by little that 'Si', a thing dedicated to hydraulic engineering, was used.

"In the land of Sanqin in Guanzhong, there have been many willow trees since ancient times; And Jingshui, Weishui, Luoshui and other waters, and the mountains in Guanzhong, there are many gravel. ”

"The one who is a willow is woven into a net with the soft branches of the willow, and the two nets are used as quilts and mattresses, and the gravel with a diameter of less than an inch is clamped in it, and it can be obtained by rolling it up with a bundle of soft branches."

Speaking of this, Yangcheng Yansheng was afraid that Liu Ying would not understand, so he pointed to the 'sushi' painted on the burlap.

Seeing that Liu Ying still didn't show a look of sudden realization as he expected, Yang Chengyan thought about it for a while, then picked up the burlap and tore it in half.

"Look at the house, this cloth is two, and it is a net woven by willow branches."

As he spoke, Yang Chengyan touched his sleeves again, looked at the soles of his feet, and finally took out a money bag from his arms.

Sprinkle the copper coins in the money bag on half a piece of burlap, lay it evenly, and then cover it with the other half of burlap, and get a mini quilt with money as wadding and linen as cloth.

Then, Yang Chengyan carefully rolled this 'quilt' into the shape of sushi like sushi, and finally raised his head excitedly.

"So, can you see it at home?"

"The money that is contained in the hemp is gravel; This thing is silicon! ”

"With this soil at the bottom of the canal, its solid soil is known, far more than the stone bricks stored in Shaofu!"

"And willow wood and gravel are all over Guanzhong, even if you take them, you don't need to spend money!!"

Looking at Yangchengyan's vivid restoration of the production process of 'Si', Liu Ying couldn't help but smile and nodded, indicating that he had understood.

After constructing the scene in her mind for a while, Liu Ying finally nodded in approval.

"Well, that's good."

"This material is laid at the bottom of the canal and on the side of the canal, which is indeed better than stone bricks, and it is much cheaper."

As she spoke, Liu Ying turned her head with interest: "In the past, what was this thing used for the water workers?" ”

You can't blame Liu Ying for being rare and weird, it's really Liu Ying who can't figure it out, why didn't she use such a good thing to pave the ditch in the past?

If it had been paved earlier, the current Zheng Guoqu would not have been blocked by sediment like that?

But when Yang Chengyan heard this, he only let out a stiff laugh with a little shame.

"This thing was originally made by a craftsman of a water worker, and was used to block the breaches of rivers and canals."

"If there is a suspicion that the embankment of a large river or a large river is unstable, the local government will also use it to strengthen the embankment to prevent it from bursting."

"And spread this thing at the bottom of the ditch and on the side of the ditch······"

"Hey, I've heard it, and no one has ever thought of it."

Hearing this, Liu Ying thought for a moment, then nodded heavily.

"If this is the case, this renovation of Zheng Guoqu, this thing, it should be of great use!"

It's very simple: the big rivers and rivers in Yangcheng Yankou must be those large-scale natural rivers that can never be built artificially in contemporary times!

And since Si can be used to strengthen the embankment and block the breach in the governance of such a large river, the small Zhengguo Canal is not a problem.

And compared with the large amount of manpower required for the mining and transportation of stone bricks, this 'silicon' is obviously easier to obtain, transport, and easy to make.

It's very simple: send people everywhere to collect wicker, pebbles and other small stones, send them all to the edge of the Zhengguo Canal, make them on the spot, and then roll down the side of the canal and lay them a little!

Thinking of this, Liu Ying also had a faint excitement on her face.

"The first hundred miles of Zheng Guoqu, except for the five miles paved with stone bricks, the remaining ninety-five miles should be used!"

"It is five miles paved with stone bricks, and it should also be used to consolidate the side of the canal!"

Saying this sentence with a little excitement, Liu Ying looked at Yang Chengyan's gaze, full of unwavering confidence.

——With Si, Liu Ying's renovation of Zhengguo Canal this time will greatly reduce both the difficulty and the cost!

If properly managed, even the renovation period is likely to be shortened by a quarter or more!

You must know that the 30,000 official slaves in Shaofu can eat a thousand stone of grain just by eating every day!

Even if the construction period is shortened by three to five days, it will undoubtedly save a lot of money for the treasury and internal funds that are now so poor that they run rats.

Thinking like this, Liu Ying was about to praise Yang Chengyan for two sentences, but when he saw Yang Chengyan's face, a little sad color suddenly swelled up.

"Shaofu?"

Hearing Liu Ying's slightly surprised question, Yang Chengyan finally sighed secretly, and looked at Liu Ying's gaze with a faint pleading.

"At home."

"Now that we have it, we have a better way to consolidate the soil upstream of the Zhengguo Canal."

"In this case, can the family take back the order and not give out the 200,000 stone bricks prepared by the Shaofu, and use it for the renovation of Zheng Guoqu?"