When I woke up early, my nose was a little itchy.

After solving the Bian River problem, they headed along the Tongji Canal towards the Jianghuai River to explore the water conditions and terrain along the road.

Along the way, Li Yuanai discovered many problems.

I also understood why this canal is called the Grand Canal of Sui and Tang Dynasties, not the Grand Canal of Sui Dynasty.

The foundation of the canal was built by Yang Guang of the Sui Dynasty. Why did the Tang Dynasty get a share of the pie?

In the final analysis, there were too many problems in the Grand Canal of the Sui Dynasty.

The completion time of the Grand Canal is too short and it is impossible to do any refinement. Most areas are cut and no matter what the consequences are. The second is because of insufficient experience and backward technology. There are also factors such as outsiders and experts in command of experts...

The southern section of the Yongji Canal fell into a blockage in just a few years. In order to pursue speed, the Yellow River water directly led to the south, resulting in the turbidity of the Bian River and the accumulation of mud and sand.

There are also many problems with Shanyangdu and Jiangnan Canal.

The four diversions of Bian Canals, the five dredgings of Shanyangdu, the three controls the Jiangnan Canals, the two carved Danba Waterway, the three controls the Baoxi Road, the three controls the former waterway of Jialing River, the Ling Canals, the Yellow River Fen Waterway, etc. were all the contributions of the Tang Dynasty to the canals, and they were not less than those of the Sui Dynasty. It was just that the Tang Dynasty followed step by step and the Sui Dynasty achieved it overnight. Therefore, later generations called the Grand Canal of this period the Sui Dynasty the Grand Canal.

Along the way, Li Yuanai recorded these shortcomings one by one.

He did not intend to start construction immediately, although these existing problems will sooner or later, and the sooner they are resolved, the better.

But the imperial court's economy did not support them doing this.

Because they met Li Shimin, not Emperor Wen of Han.

In fact, after such great turmoil as the end of the Sui Dynasty, the best way is to rest and recuperate, stay dormant for thirty or forty years, and then show your strength.

This is the best choice for the people's livelihood in the world...

Li Yuanai probably is also the reason why his father Li Yuan has been biting his own cheap brother to death.

Li Shimin's character is destined to be impossible to become a stable and successful monarch.

Therefore, for Li Shimin, he would not think about doing any major projects. Once he had money, he would use them to fight wars and expand his territory.

Even the money for building the sluice this time was taken out from the gaps. The main purpose was not to benefit the people, but to conquer Goguryeo's grain channels. All the benefits brought about by building the sluice dam were accompanied by...

Li Yuanai also made sufficient preparations for the main purpose of this trip.

For the sluice dam, Li Yuanai only plans to build two types of dams this time.

One is a lock that facilitates ship passage by adjusting the water level. Another type of lock is specially used to control the water volume of canals. This kind of lock includes a water inlet gate and a water reduction gate.

The former type of dam generally requires the construction of two gates, the upper gate and the lower gate, which are generally built in areas with large slopes, rapid water flow and high risk of sailing. The design of the upper and lower gates makes a closed gate chamber with stable water levels between the two gates.

Open the gate and close the gate, the ship sails into the gate chamber, then close the gate and open the gate, so that the gate chamber is filled with water, and the ship can pass through the careful and dangerous area very stably.

Another type of sluice is like the literal meaning. The sluice inlet is built at the junction of the water source and the canal. When the water volume of the canal is insufficient, the gate will be opened to input the water source into the canal, and the water level of the canal will be increased.
Chapter completed!