1, the river is short, the Lingshui is slightly higher than the sea surface, and there is more water vapor, so the river flow is large and a lot of sediment is washed down.

2. The sanitary environment depends on the help of Lingshui people.

3, sand mining, sand has the ability to filter, when you see a river that is not in the rainy season is getting more and more turbid, it means that its sand is decreasing.