Main purpose
1. Vertical and horizontal drainage and permeability of highways;
2. Vertical and horizontal drainage on the back of various retaining walls and side ditches on highways;
3. Drainage of tunnels and underground passages;
4. Water supply and drainage for municipal engineering, water treatment plants, sewage treatment plants, garbage dumps, etc;
5. Drainage of rest green spaces such as golf courses, sports fields, and parks;
6. Soil and water conservation for slope development in mountainous areas;
7. Underground drainage for land preparation projects;