Why is Qingtongxia divided into large dams and small dams?

In fact, it is like this. Originally they all belonged to one area or were called one place by this name and that name. Then after the Qingtongxia Reservoir was built, some people wanted to work there. They called it Shangshan Dam. , and the local residents who work live not far away. Both of these places are around the reservoir. Some people called the place where they worked a dam, and the place here called home, but it didn’t sound good, so it became a small dam. . To put it bluntly, one place is affiliated to Qingtongxia. For convenience, one is where they work and the other is where they settle down, just like Qingtongxia Town and Qingtongxia City.