Wu Muyue shook his head after hearing this and said, "This Miao River is indeed not easy to manage. No dynasty has ever managed to manage this river well. When floods occur, they either let the river run rampant or find a place to open a channel to divert the water. Either way, some sacrifices are required."

Xu Bai thought of the methods for controlling floods in later generations. He lamented that current technology was too backward, and many things were just ideas that couldn't be truly implemented. He sighed and said, "Is there really no way to control floods? People always say that man can conquer nature, but isn't that just empty talk?"

Wu Muyue waved his fan and said, "You can't say that. Everything in the world that exists has a reason. Take this flood, for example. Why does it exist? I once went to the upper reaches of the Miao River. There are many mountains that run north to south. Every year when the wind blows from the southwest, there will be heavy rain on this side of the mountains. The rainwater from the mountains flows down and collects at the foot of the mountains, which forms the source of the Miao River."

Xu Bai was dumbfounded when he heard Wu Muyue's words. He really did not expect that Wu Muyue, as an ancient person, could observe the ultimate source of the Miao River flood so carefully.

Chen Yuyuan asked with great interest, "Teacher, why does it only rain on the mountains upstream of the Miao River after the wind blows from the southwest?"

Wu Muyue shook his head and said, "I lived in the mountains upstream of the Miao River for several years and only observed this phenomenon: many times, it would rain in this area after the southwest wind blew. As for why this is, I really can't explain it. The Miao River has been managed every year, but there has never been an effective way to manage it. Whenever there is a flood, we can only let it rage or find a place to break the dike to release the flood."

Xu Bai nodded repeatedly at Wu Muyue's words. Not to mention that Wu Muyue observed that heavy rain would fall when the southwest wind blows, let's talk about flood control. Even in future generations, when floods are too severe, there will be specially reserved flood discharge areas to release floodwaters, in order to protect more valuable places.