Why did the rich in ancient times put many water tanks in front of their doors?

In ancient times, many people, especially the rich, had large water tanks at home, which were not only beautiful and exquisite in shape, but also placed in the most conspicuous position in the courtyard, representing an indispensable position in the courtyard decoration. Besides, the representative of the giants is the Forbidden City. According to statistics, there were 308 large water tanks in the Forbidden City. There are eighteen mouths, including four in front of the Hall of Supreme Harmony. When Eight-Nation Alliance invaded China, he ran into the Forbidden City. The invaders actually scraped off the gold on the jar with bayonets, which is still visible. Of course, there are so many water tanks in such a delicate palace compound, let alone ordinary people who follow the royal family. According to Feng Shui, it is good to settle in places surrounded by mountains, especially rivers or springs. If it is not realistic, then in the worst case, you have to open a well or put a water tank at home. So, were the ancients based on this statement? Not exactly. In ancient times, there was no running water. If ancient people didn't dig wells and put a big water tank at home, it would be extremely inconvenient to use water. People who are close to the water source are fine, while those who live far away from the water source have to go several miles or even farther to get water. Adults always like to tell the story of "three monks have no water to drink" to warn children not to shirk their work and learn to cooperate. However, it also shows that water was scarce in ancient times, and even they needed to transport water from far away places. Water shortage in ancient times can also be seen from successive years of drought. There are always fragments of Buddhists praying for rain in TV series, because successive years of drought have made the people miserable, and the son of heaven is very distressed to come up with a way to comfort the people. Drought also led to a large-scale plague, and historical records recorded: "Great Drought. The people in Hengshan, Hedong and Yunzhong counties are plagued by epidemic diseases. Old books in the Tang Dynasty recorded: "Fujian and other provinces were dry, Jing Quan was dry, people were thirsty, and many people were sick. "