Yun Yanyao saw that he, the fourth brother who had been interested in all kinds of books since he was a child, and who had seen a lot of things, couldn't understand what was drawn on this manuscript paper, and he was even more puzzled about Lan Ling'er in his heart, how could a young lady who had never been out of the boudoir understand this?

"Fourth brother, if you take a closer look, you really can't see what is painted on it?" Yun Yanyao didn't believe it in his heart, the fourth brother had read a lot of those ancient books since he was a child, maybe he just didn't recognize the things drawn on this manuscript paper for a while.

"Brother Chen really can't see it, Brother Huang, is this manuscript paper very important? Do you want your brother to take it back and study it carefully? Yun Yanmo was puzzled, and shook the manuscript paper in his hand, he really hadn't seen anything like this, and the imperial brother didn't know where he got it.

"No need, I'll tell you." Yun Yanyao stood up, walked to Yun Yanmo's side, stretched out his hand to take the drawings in Yun Yanmo's hand, and explained them to him in detail.

The method is like this, in order to avoid floods, you can't use the method of blocking water, the dam can't do it, you can only use the method of water diversion, that is, digging through the major rivers, building reservoirs, when there is a lot of rain, you can store water in the reservoir for use, after digging the river, it forms the effect of circulating water, that is, when there is more water here, it will follow the digging through the river and flow to other rivers.

If the method of holding back the water is adopted, the amount of water blocked by the river will increase day by day over the years, and when the dam can no longer withstand the impact of the river and collapses overnight, the water will spread like a fierce monster.

Using the method of water diversion, as long as there is too much rain in one place, then it will flow along the river to other rivers, which not only solves the problem of floods, but also solves the problem of drought, as long as the whole Yunyi country is not in drought, then, where there is too much rain, the water flow will naturally be more, and then the dug circulating river will flow to the arid place, so that the problem of lack of water for crops can be solved.

Of course, these rivers that must be dug are only an outline of a method, and as for the details, it still takes time to build, but such a profitable method is worth spending a lot of time and money to build, and besides, in terms of manpower, Ling'er also gave a suggestion, that is, to use civil forces to mobilize the people to do this, but it must be built on a voluntary basis, and those who participate in digging the river can get a small subsidy fee, as well as three meals a day.

After the completion of the big project, the small project is carried out, that is, on the edge of the field where the crops are grown, there should be a small river to divert water, which is convenient for irrigating the crops, of course, it is impossible to have such a small river in every crop field, only a crop field can share a canal.

(Ahem, the above is the Lun family's cranky thoughts, don't criticize the Lun family for not going to school and don't understand anything because of this, it's really that the Lun family is not interested in this, and it has been thinking about it in my mind for a long time to be able to write like this.) So don't curse! ）

"Brother Huang, how did you come up with this method? Such a good method, if implemented, will definitely be very useful. Although Yun Yanmo still didn't smile, the smile that overflowed his eyes betrayed him.