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"What's the solution?" Li Ke came to his senses, and looked at Li Ke with blazing eyes.

"This?" Li Su groaned, pretending to be pondering.

Li Ke was a little anxious, this was an opportunity to show his face in front of the emperor, after the dispersal of the dynasty, the crown prince Li Chengqian, and the king of Wei, Li Tai, both organized retainers to discuss this issue, and he, the king of Shu, could not lag behind.

Seeing Li Ke's impatience, Li Su thought that he did not have an official position in the court, and rashly entered the palace to offer advice to Li Shimin, it was inevitable that he would have the leisure to flatter and compete for favor, if he told Li Ke this method, it would be much more effective for him than himself, and it would also make Li Ke grateful to himself, but Li Ke was not the one who suffered the loss, "I can inform the third brother of this method, but the third brother of my father's heavy reward has to be given to me!" ”|

Li Ke was overjoyed, compared to his father's appreciation, what is this reward, he said: "There is no problem with this, sixth brother, just say it quickly, it's really a rush to death!" ”

Taking Li Ke to the study, Li Su picked up a piece of paper and drew the floor plan of Chang'an City with his memory.

Li Ke stood on the side, looking at Li Ke using a ruler to draw a straight line and a vertical line on the one hundred and eight square roads in Chang'an from time to time, at this time, he couldn't help but feel a little magical, but he didn't expect that this sixth brother was hidden before.

After drawing the preliminary plan, Li Su drew some small lines on these roads, walked along the road of Chang'an City, and finally led this line to Jingchuan outside the city.

"Although there are five canals in Chang'an City, in the event of heavy rainfall, the five canals will not only fail to drain the water, but will cause the backflow of the river, making the waterlogging more severe." After finishing the drawing, Li Su put down his pen and said.

Li Ke picked up Li Su and drew the drawings, looked at them again and again, and said, "Sixth brother, what do the black lines on these roads mean?" ”

"This is the root of solving the waterlogging in Chang'an, the underground pipeline!"

"Underground pipes?" Li Ke had never heard this fresh word, and looked at Li Ke suspiciously, waiting for his explanation.

"It's a kind of facility that's buried in the ground." In order to be more vivid, Li Su picked up a teacup and put it in front of Li Ke, "Do you see this teacup?" Punch through the bottom of this teacup, this is the pipe, now bury this kind of pipe into the ground, leave the pipe mouth on the ground, once it rains, the rainwater will pass through the guò pipe mouth into the pipe, and then flow through the pipe to the downstream of Jingchuan outside the city, so that once it rains, the water will quickly dissipate, and the waterlogging in Chang'an City can be solved forever. "Li Su studied engineering construction, so he is naturally familiar with this problem, and when he came back, he was thinking about it.

"I see, it's really a divine strategy, how could I not think of it!" Li Ke pointed to another line next to the pipeline line, "So what is this line?" ”

"It's a rainwater pipe just now, and this is a sewage pipe!" The toilet sanitation of the Tang Dynasty Li Su criticized it for not a day or two, and he took this opportunity to solve it together, and without waiting for Li Ke to ask, Li Su continued: "This sewage is also drained, but it is not rainwater that is discharged, but feces and urine, and a huge septic tank is built at the end of this pipe, and after precipitation, it is a natural fertilizer." ”

Li Ke was stunned, he hadn't thought about this problem before, now Chang'an City and urine, the imperial court has sent special personnel to pick out the city, once this sewage pipeline is completed, won't it save a lot of expenses, although he doesn't understand what kind of septic tank it is, but he can't wait to present this method to Li Shimin!

"Sixth brother, you are so smart!" Li Ke walked around excitedly, Li Ke was ashamed, this is not his own knowledge, it is really plagiarism.

After the general plan was told to Li Ke, Li Ke dragged Li Su and began to discuss the specific details, tossing for a day, until finally Li Su told him all the pipeline knowledge, Li Su was tired and went to bed early, but Li Ke was as excited as if he had smoked ** all night, and the lights in the house were not extinguished all night.

The next day, Li Ke went to court as usual, looking at the Manchu Dynasty with full confidence and self-confidence, smiling and looking at those colleagues who were still helpless when they got together.

"The third brother is so comfortable, he has solved the problem left by his father!" When Li Ke was secretly smug, a voice came from behind.

"Brother see His Royal Highness the Prince!" This voice is very familiar, it is from Li Chengqian, Li Shimin's sister-in-law, and the crown prince of the dynasty.

"Third brother is exempt!" Yesterday, he also asked the officials of the East Palace to discuss this problem and came up with a solution, seeing that Li Ke was holding the ticket, he couldn't help asking.

"Brother Chen just has some humble opinions!" Li Ke casually prevaricated.

Li Chengqian smiled, he understood that there was no truth from Li Ke's mouth, although he was now the crown prince, but he understood that Li Tai, the king of Wei, and Li Ke, the king of Shu, were both attentive to themselves.

Just thinking about it, Li Shimin walked into the Taiji Palace, and after the mountain shouted long live, Li Shimin said: "Regarding the waterlogging in Chang'an, do you Aiqing have a solution?" ”

"Enlighten the father, the son thinks about it day and night, and thinks of a way!" Li Chengqian bowed and said.

"Oh?" Li Shimin looked at his favorite son and said, "Let's hear it!" ”

Li Chengqian said: "The waterlogging in Chang'an City is caused by the five canals in the city being too narrow, and the ministers think that by opening up the five canals, the waterlogging problem can be solved once and for all!" ”

"The prince has a point." Li Shimin nodded with satisfaction.

"Father, the son thought that it was not appropriate to open up the five canals, yesterday the dynasty was dispersed, the son personally investigated the waterlogging situation in Chang'an City, and the five canals were all irrigated, if it was developed, the backflush would be more strict!" At this time, Li Tai, the king of Wei, spoke.

Li Shimin frowned, "Then do you have a solution?" He looked at Li Tai.

"Erchen hasn't thought of a proper way yet!" Li Tai's face was ashamed.

After Li Tai said that, the court was silent, and Li Shimin said angrily: "Is it so difficult to solve a waterlogging problem?" ”

Li Ke felt that the time had come, and at this time he came out and said: "Enlighten the father and the emperor, and the sons have a good plan!" ”

"Ke'er, talk about it!" A glimmer of hope rose in Li Shimin's heart.

At this time, Li Ke took out a drawing from his cuff and said, "Father, the solution to the waterlogging in Chang'an is on this map, please take a look at it." ”

"Bring it on!" Xiao Huangmen immediately took the drawings from Li Ke and handed them to Li Shimin.

Opening the drawings and looking at the various straight lines and origins on the drawings, Li Shimin was puzzled: "What is this?" ”

Li Kecheng held the bamboo in his hand and said: "This is the drawing of the underground pipe network, which is divided into sewage and rainwater ......"

In the court, Li Ke talked endlessly, and told Li Shimin the knowledge that Li Su taught him one by one, and he had the posture of fighting Confucianism, and on the dragon chair, Li Shimin nodded frequently.

"Good!"

After Li Ke finished speaking, Li Shimin shouted.