Why are stone mills thrown by the river?

The stone mill was thrown by the river because it needed water as power to facilitate work. According to relevant information, water mills are also called stone mills, and stone mills have an inseparable relationship with river water. The water mill is powered by water and does not require much water flow. Old people often say: just one dam of water is enough. In order to control the amount of water, people dug channels to divert water to the river where the water mill was built, so that the water formed a drop. They built a downward-sloping water tank and used the inertial force of the water flow to push the wheels below to rotate. The water mill was built just below and across the canal.