Liu Ying's short ten numbers made Yang Chengyan's eyes widen!

Looking at Yang Chengyan's slightly surprised, vaguely unpredictable, and obviously thinking quickly, Liu Ying couldn't help but smile secretly.

- Fixing the soil in the upper reaches of the river seems to be a little out of reach for Liu Ying, who was just a child of a poor family in his previous life.

But what is so strong and unfortunate is that in the first life, Liu Ying lived in the countryside in the northwest with her parents before the college entrance examination at the age of eighteen······

Liu Ying still clearly remembers that when she was a child, the village still retained a system similar to 'forced labor', that is, every year when the farm was slack, each peasant family had to send a strong man to participate in voluntary labor.

Occasionally, it is the excavation and paving of roads;

However, in the great northwest, where water resources are scarce and agriculture is extremely important because of poverty, more often than not, forced labor is the excavation of small rural canals.

In that life, after reaching the age of fifteen, Liu Ying could not bear to let her elderly father and her eldest brother, who had a slight disability, serve in forced labor, so she began to take on this responsibility for the family.

And from the age of fifteen to the eighteenth age after Liu Ying's big exam, four years before and after, every autumn, Liu Ying participated in the conscription on behalf of his family, all of which were digging and building canals!

In later generations, the northwest was dry and hot, and water resources were extremely scarce, so in the process of excavation and construction of canals, there were very strict requirements for 'water seepage prevention'.

At the same time, the Great Northwest was very poor at that time, and did not have the conditions to spend a lot of money to lay a plastic impermeable layer under the canal, or to build a canal directly out of concrete.

Therefore, at that time, in order to prevent the canal water from seeping into the soil before it flowed downstream, the township cadres would instruct Liu Ying and others to lay rocks at the bottom of the canal.

That memory is so far away for Liu Ying at this time.

But that carefree and full happy memory only needs a little introduction to be recalled.

Coming back to her senses from the sweetness of her memories, Liu Ying found that she already had a way to fix the soil in the upper reaches of the river in her mind.

- Rocks!

For the most part, it was the cheapest, least technical, and no side effects!

According to Liu Ying's idea, in the great northwest of the previous life, by laying rocks on the side and bottom of the canal, the water of the canal could be prevented from seeping.

If it can prevent the seepage of the canal water, how can it not fix the sediment upstream?

The upstream sediment is compacted and fixed by stones, so why is it said that the downstream is blocked by river sand and silt?

And at this point in time, as the crown prince, Liu Ying, the materials that can be used in his hands and the power that can be mobilized are far better than those of the Great Northwest in later generations······

While Liu Ying was falling into memories, Yang Chengyan was also thinking.

At that moment, Yang Chengyan only felt a faint point of light flash in his dim mind!

But before Yang Chengyan could catch it, the point of light flashed away.

"Heavy ······"

Compacting ······

As if he had been snatched away, his eyes were numb and murmured twice, Yang Chengyan finally 'returned to his soul', and his gaze at Liu Ying was full of fanaticism for the unknown!

"Dare to ask the family!"

"What should be used to press the soil upstream of the canal?!"

Even if Yangcheng Yansheng was afraid that Liu Ying would be frightened by himself, he tried his best to suppress the excitement in his heart, and it was not difficult for everyone in the palace to see: Prince Liu Ying, I am afraid that there is something terrible in addition to it!

For a moment, everyone in the hall couldn't help but hold their breath, and their lonely eyes switched back and forth between Yang Chengyan and Liu Ying.

Seeing Liu Ying groaning slightly, looking at Yang Chengyan's gaze, there was a faint sense of determination.

"Stone!"

"Stone it!"

"With the huge weight of the stone, you only need to stick to the bottom of the canal, lay a hundred catties of boulders and tamp it, and you can consolidate the soil in the upper reaches of the canal!"

Hearing Liu Ying's words, Yang Chengyan was only stunned in place, his brain was running rapidly, and he reproduced the picture depicted by Liu Ying.

Stones of more than a foot in length and width slid down the planks on the side of the canal; One by one, the servants and officials and slaves stood at the bottom of the canal, and three or two people worked together to lift the stones and lay them regularly at the bottom of the canal.

As one stone after another was spread as tightly as possible to the bottom of the canal, the entire bottom of the canal was pressed to a thousand pounds.

The bottom of the ditch, which had to be hammered and tamped with hard labor, was only pressed down by the stones laid; In addition, if the stones are pressing, the sediment at the bottom of the canal will no longer be washed away by the current······

"Not right······"

"The stone is more sleek, not square, and has its own gaps; The sediment in the canal will still be washed away a little ······"

Secretly muttering to himself, Yang Chengyan only nodded to himself.

When Yang Chengyan's eyes that were numb like the walking dead reappeared as bright as a 'creature', Yang Chengyan's face was full of admiration for Liu Ying.

Laying stones at the bottom of the canal will indeed have gaps, and still allow some of the sediment to be washed away!

But even so, it is much better than laying nothing, just tamping the soil at the bottom of the canal, and letting the soil layer be washed away by the current!

"Home!"

With a hand full of excitement, Yang Chengyan looked at Liu Ying's gaze, and there was a little light in the eyes!

"The minister thinks that what the family says is indeed the perfect strategy for consolidating the soil upstream of the canal!"

"Although there is a gap in the rocks, it may still cause the upstream sediment to be lost, the downstream sediment to be blocked, and the blockage of the river channel can also be greatly slowed down!"

"If Zheng Guoqu implements this method, the bottom of it is paved with stones, or the downstream silt can be cleared every five years, and the soil upstream can be filled in every ten years!!"

Listening to Yang Chengyan's excited worship, everyone in the hall widened their eyes and threw their unbelievable gazes at Liu Ying.

Prince: This is ······

In just a few words, it subverted the art of plumbing in the world?

Just when the hundred officials in the hall wanted to get into the wrong and struggled to digest the 'perfect strategy' in Yangchengyan's mouth, they saw Liu Ying above the imperial stairs, and only smiled and shook his head.

"Dig the downstream once every five years, fill the upstream ······ every ten years"

"Alone, it is still too frequent; The court was wasted, and the people were tired. ”

Without changing his face, he said this sentence 'not enough', Liu Ying turned his head sideways with a smile and looked at Yang Chengyan with a playful face.

"There is a gap in the stone because it is not square."

"Today's Shaofu, is it impossible to obtain the Founder Stone?"

Hearing Liu Ying's words, Yang Chengyan couldn't help but be stunned again.

It's just that this time, Liu Ying didn't give Yang Chengyan a chance to brainstorm.

"Whew~"

With a sigh, Liu Ying stood up, walked down the imperial steps, and came to Yang Chengyan with a smile.

"Lonely news, although the construction of Chang'an City has not been settled for a long time, but since the fifth year of the Han Dynasty, Shaofu has already started, cutting stones to take two feet long and wide, and stone bricks one foot thick, so as to use them for casting the city in the future?"

As she spoke, Liu Ying couldn't help but smile, stretched out her hand to the door of the hall, and made a 'please' gesture to Yang Chengyan.

"Lonely, I want to go to Shaofu to cut the stone bricks and see the stone bricks!"