Is there a water-absorbing stone in Dujiangyan?

There are water-absorbing stones in Dujiangyan River. In Dujiangyan ancient water conservancy project, water-absorbing stones have been skillfully used. The reasonable distribution of water flow and the optimization of irrigation effect can be realized by manually arranging water-absorbing stones. The existence of water-absorbing stones plays an important role in Dujiangyan's water conservancy management. Water-absorbing stone (also known as water well stone) refers to a special stone with water absorption capacity, and its water absorption characteristics can help adjust the water level and play a role in flood control and water supply.