1. Related problems and their causes
Due to the current shortage of urban land in China, people like the living environment surrounded by mountains and water. The riverside waters in some cities are constantly occupied by people, the watershed area is getting smaller and smaller, and the width of the river is getting narrower and narrower. The rivers are dug deep and stretched out. As a result, the construction of embankments to protect the river has become more intense and the cost of construction has increased.