Even if it does get blocked and cant be fixed by flooding it with water, it's not a problem. System had predicted this issue early on.
That's why the auxiliary pipes are laid close to the ground, just for easy differentiation. The route above the auxiliary pipes will be transformed into a half-meter-wide green belt. It's not only aesthetic but also serves to clearly indicate that life-supporting auxiliary sewer pipes are located below the green belt.
Huang Yuan had a troubled look on his face, "I understand what you're saying, but what do we use to make the sewer pipes now? We can't use wood, as it will rot if it gets soaked in water for a prolonged period of time..."
Su Tang had previously discussed this issue with Gaiyin.
The hollow tree they previously used to weave steamers, which looks quite like bamboo, except it doesn't have the bamboo joints and it's hollow all the way through with a uniform thickness.
