"Yu Jiashang, Xiao Xiang."

I saw Yang Chengyan get up leisurely, take out a roll of bamboo slips that had been prepared long ago from his arms, and spread it out slowly.

"Zheng Guoqu, repaired in the first year of the reign of King Qin, to the end of the tenth year of the reign of the king."

"The head of the canal is on the opposite bank of the valley mouth, along the three plains, Fuping direct flow to the east, through the lotus spoon, and flows into Luoshui ten miles north of Chongquan."

"The length of the canal is three hundred and seventeen miles, the original top is fifteen zhang wide, and the bottom is nine zhang."

Speaking of this, Yang Chengyan closed the bamboo slip in his hand and raised his head with a slightly solemn face.

However, in recent years, the water of Zheng Guoqu has been decreasing year by year; Coastal counties and farmers wanted to dredge the canal, but they didn't know how to do it, so they had to widen the canal. ”

"Therefore, the top of Zhengguo Canal is nearly 20 zhang wide, and the bottom is nearly 1······6 zhang wide."

Hearing Yang Chengyan's introduction, Liu Ying's face couldn't help but sink slightly.

What Yang Chengyan said about 'the farmers in the county want to dredge the canal, but they don't know how to do it', is actually that the people are anxious when they see the water in Zhengguo Canal getting less and less, and they want to do something, but they are kind enough to help.

Because of the width of the channel, it will directly affect the flow rate of the water and the impact capacity of some shallow channel sections.

Take the Zhengguo Canal as an example: the original Zhengguo Canal was nine zhang wide at the bottom, and the water flow was turbulent, even if some sections of the canal were blocked by silt and garbage, the water volume and water pressure of the Zhengguo Canal also had the ability to dredge the blocked river section through the impact of the water flow.

But now that the channel has been widened, the flow of water has become sluggish, and the blocked section that could have been washed away by the current can no longer be 'automatically flushed' by the Zhengguo Canal.

In addition, the slower flow of water makes it easier for sediment in the water to settle, which further aggravates the blockage of the downstream of the Zhengguo Canal.

In this way, the Zhengguo Canal is more blocked every year, and it is widened by the people every year;

In turn, the widening of the canal has made the Zhengguo Canal more and more blocked due to the slowing of the water flow.

Under the vicious circle, Zheng Guoqu has become what he is now, which clearly exists, but almost loses its effectiveness.

Liu Ying was thinking about it, when he saw Yang Chengyan slowly straighten up and look at Xiao He in the middle of the imperial steps.

"This time, the family was ordered by His Majesty to renovate the Guanzhong Water Conservancy; The Guanzhong water conservancy is especially led by Zheng Guoqu. ”

"In this way, the maintenance of the Zhengguo Canal not only needs to dredge the blocked places, but also fills in the soil on both sides of the canal to reduce its width."

Hearing this, Liu Ying's face sank, which was originally quite relaxed, and she showed a little solemnity.

- Previously, Liu Ying came up with the number of forced laborers and the construction period of '50,000 people, three months', only taking into account the river dredging, but did not include the reduction of land filling!

Thinking about it, Liu Ying raised her head with a solemn face and looked at Shaofu Qingyang Chengyan.

"Please also ask Shaofu to speak up."

"If you want to dredge and widen the Zhengguo Canal, how much labor is required, and how long will it take?"

Hearing this, Yang Chengyan's face suddenly showed embarrassment, and he was entangled and muttered for a moment, and finally bowed his hand.

"Honored by the family."

"If it is only unblocked, it shall be necessary to use 40,000 laborers for two months; However, if you increase the channel and reduce the leniency, I am afraid that it will be doubled······"

"And now, autumn and August are coming to an end, and in a few days, it will be autumn and September."

"In previous years, the water of Zhengguo Canal froze, mostly in mid to late October; It's not more than a month and a half away. ”

Speaking of this, Yang Chengyan finally let out a long sigh and gave his final conclusion.

"Therefore, if the renovation of the Zhengguo Canal is to be completed this winter, the flow should be cut off at the head of the canal as soon as possible, and 60,000 troops should be used to dig up the mud blocked in the canal."

"If not, when the first snow in Guanzhong is frozen, the Zhengguo Canal is frozen, and the bottom of the canal is frozen soil, I am afraid that it will be difficult to complete the channel dredging with 100,000 people······

Hearing this, the ease and comfort in Liu Ying's heart disappeared, and her face finally became solemn.

The meaning of Yangcheng Yan's words, Liu Ying naturally understood it.

Now that the autumn harvest has passed, there are only about 40-50 days left before winter.

If you want to complete the excavation and removal of the blocked part of the canal before it freezes and the sediment at the bottom becomes frozen soil, you must immediately block the flow of water from the upper reaches of the canal and immediately start excavating the sediment at the bottom of the canal.

However, in this way, if you want to complete the excavation and cleaning of the silted part of the Zhengguo Canal in these 4 to 50 days between now and before winter comes, you need at least 60,000 people to ensure that it is completed.

"60,000 ······"

With a soft murmur, Liu Ying pursed her lips slightly, and looked at Yang Chengyan with a solemn voice.

"The meaning of Shaofu is that the dredging of Zheng Guoqu should be completed before the winter solstice; However, the matter of channel widening, can it not be rushed for the time being? ”

Hearing this, Yang Chengyan only nodded slightly.

"When the winter solstice comes, the wet mud at the bottom of the canal should be set up as frozen soil, and it is extremely wasteful to dig, so it should be finished before the early winter!"

"and filling in the channel to reduce the widening, which can also be ······ after the winter solstice"

"How much labor is needed?!"

Before the words fell, I saw Liu Ying hurriedly asking again, and Yang Chengyan only groaned slightly.

"Fill the soil for 20 days, tamp it for 20 days······"

After a little calculation in his heart, Yang Chengyan nodded secretly, and then bowed his hand slightly: "It's also 60,000, and you can work for more than a month." ”

Hearing this, Liu Ying breathed a sigh of relief in her heart, and her face softened slightly.

"60,000 people, more than three months ······"

Compared with Liu Ying's previous forecast of '50,000 people, three months', it is only 10,000 more.

Although it is still within the acceptable range, Liu Ying's heart is still not too relaxed.

- Previously, Liu Ying came up with a forecast of '50,000 people, three months', which was calculated according to the highest standard!

That is: no more than 50,000 people, and no more than three months.

And the '60,000 people, more than three months' in Yangcheng Yankou is obviously estimated in the most optimistic situation.

That is, the minimum is 60,000 people, and the shortest is more than three months.

Thinking of this, although Liu Ying's expression on her face was not calm, it was also full of solemnity.

Under the heavy heart, Liu Ying couldn't care about 'humility', only bowed to Xiao He, and came to the center of the imperial steps.

"This time, the renovation of Zheng Guoqu requires 60,000 forced labor and more than three months of labor to be able to make the trip."

"However, my father and the emperor drove the expedition in person, and the people were young and strong, and the villagers were brave and brave, and there were hundreds of thousands."

"Therefore, the meaning of loneliness is not to be conscripted to labor in Guanzhong to increase the fatigue of the people."

Saying that, Liu Ying turned sideways slightly and looked at Yang Chengyan: "The day before yesterday, I ordered the Shaofu to check the officials and slaves of the Shaofu Chengdan, the ghost salary, and the subordinates. ”

"I don't know if Shaofu has ever found out?"

Hearing this, Yang Chengyan hurriedly bowed his hand, and immediately took out another roll of bamboo slips from his arms and spread it out.

"Honored by the family."

"Today, Shaofu has official slaves, 7,491 Chengdan, 3,136 ghost salaries, 15,625 subordinate ministers, and a total of 26,252 male slaves."

"In addition to the official slaves needed for the construction of Changling, plus white rice and concubines, there should be 32,000 ······"

Hearing this, Liu Ying only nodded slightly, and when she looked at the hundred officials in the hall again, the corners of her mouth couldn't help but swell with a wary 'warm' smile.