"What way?" Li Ke regained his energy and looked at Li Yin with piercing eyes.

   "Is this it?" Li Yin pondered for a while, pretending to be deep in thought.

  Li Ke was a little anxious. This was an opportunity to show his face in front of the emperor. After the dynasty was dispersed, Prince Li Chengqian and King Wei Li Tai organized their retainers to discuss this issue. He, the king of Shu, could not fall behind.

Seeing the impatience on Li Ke's face, Li Min thought to himself that he had no official position in the court, so he rushed into the palace to offer advice to Li Shimin. I am a lot older, and I can make Li Ke appreciate myself, but Li Min is not the one who suffers, "I can tell third brother about this method, but third brother has to give me the reward of father and king!"|||

   Li Ke was overjoyed. Compared with his father's appreciation, this little reward is nothing. He said: "There is no problem with this. Sixth brother, you can tell me quickly, I am really anxious to death!"

  Taking Li Ke to the study, Li Yin picked up a piece of paper and drew the plan of Chang'an City from his own memory.

Li Ke stood on one side, watching Li Yin use a ruler to draw a straight line and a vertical line from time to time to draw the 108 roads in Chang'an. At this moment, he couldn't help but feel a little strange. leak.

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

   "Although there are five canals in Chang'an City, in case of heavy rain, the five canals will not only fail to drain water, but will cause backflow of river water and make waterlogging worse." After drawing the drawings, Li Yin put down his pen.

  Li Ke picked up Li Yin and drew the blueprint, looked at it again and again, and said, "Sixth Brother, what do these black lines on the road mean?"

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

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

"This is a facility buried underground." In order to make it more vivid, Li Min picked up a teacup and put it in front of Li Ke, "Did you see this teacup? Pierce the bottom of this teacup, this is the pipeline, Now bury this kind of pipe in the ground, and leave the pipe mouth on the ground. Once it rains, the rainwater will enter the pipe through the pipe mouth, and then flow through the pipe to the downstream of Jingchuan outside the city. In this way, once it rains, the water will accumulate It will soon dissipate, and the waterlogging in Chang'an City can be solved forever." Li Yin studied engineering construction, so he is naturally familiar with this problem, and when he came back, he was thinking about it.

   "So that's the case, it's really a brilliant plan, why didn't I think of it!" Li Ke pointed to another line next to the pipeline line, "Then what is this line?"

"The one just now was a rainwater pipe, and this one is a sewage pipe!" Li Yin, the toilet sanitation in the Tang Dynasty, had been complaining for a day or two, and took this opportunity to solve it together. Before Li Ke could ask, Li Yin continued: "This sewage is also Drainage, but instead of rainwater, excrement and urine are discharged, and a huge septic tank is built at the end of this pipe, and after sedimentation, it is a natural fertilizer."

Li Ke was stunned. He had never thought about this problem before. Now the imperial court has sent special personnel to pick out the excrement and urine in Chang'an City. Once the sewage pipeline is completed, it will save a lot of expenses. The septic tank didn't understand at all, but he couldn't wait to present this method to Li Shimin!

   "Sixth brother, you are so smart!" Li Ke walked around excitedly, and Li Yin was ashamed that this was not invented by himself, it was plagiarism.

After talking with Li Ke about the general plan, Li Ke dragged Li Yin to discuss the specific details. After a whole day of tossing, Li Yin finally told him all the pipeline knowledge. Li Yin was tired and went to bed early. However, Li Ke was as excited as if he had smoked a cigarette all night, and the lights in the room stayed on all night.

  The next day, Li Ke went to court early as usual, looking confident in the civil and military affairs of the Manchu Dynasty, smiling at those colleagues who were still at a loss when they got together.

   "Third brother is so contented, could it be that he has solved the problem left by the emperor!" When Li Ke was secretly complacent, a voice came from behind.

   "My brother, see His Highness the Crown Prince!" The voice was very familiar, it was from Li Chengqian, Li Shimin's direct son, the current crown prince.

   "The third brother is exempt from the ceremony!" Yesterday when the court was over, he also asked the officials of the East Palace to discuss this issue and came up with a solution. Seeing that Li Ke was holding the winning ticket, he couldn't help asking.

   "The younger brother just has some humble opinions!" Li Ke casually prevaricated.

  Li Chengqian smiled. He knew that Li Ke could not tell the truth. Although his position as prince was stable now, he understood that Wei Wang Li Tai and Shu Wang Li Ke both kept an eye on him.

  Just as he was thinking, Li Shimin walked into the Tai Chi Hall. After shouting Long Live, Li Shimin said: "About the waterlogging in Chang'an, do you have a solution?"

   "Reporting to my father, I have been thinking about it day and night, and I came up with a solution!" Li Chengqian bowed.

   "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 narrowness of the five canals in the city. My son thought that opening up the five canals would solve the waterlogging problem once and for all!"

   "The prince is right." Li Shimin nodded with satisfaction.

"Father, my servant thinks it is inappropriate to open up the five canals. Yesterday, when the court was dismissed, I personally investigated the waterlogging situation in Chang'an City. Backwaters have appeared in all five canals. If they are opened up, the backwatering will be even more serious!" At this time, Wei Wang Li Tai opened the mouth.

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

   "I haven't thought of a proper solution yet!" Li Tai looked ashamed.

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

  Li Ke felt that the time had come, so he stepped out at this time, saying: "I report to my father, my son has a good plan!"

   "Ke'er, speak quickly!" 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 drawing, please look it over."

   "Submit it!" Xiao Huangmen immediately took the drawing from Li Ke and handed it to Li Shimin.

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

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

  In the court hall, Li Ke was eloquent, telling Li Shimin the knowledge that Li Yin taught him one by one, and he was fighting the Confucians with his tongue. On the dragon chair, Li Shimin nodded frequently.

"good!"

   After Li Ke finished speaking, Li Shimin shouted.