(Hard pipe drainage pipe, also known as: Plastic Blind Trench, Drainage Pipe, Corrugated Mesh Permeable Pipe) The upper two-thirds of the hard pipe drainage pipe feature small holes, while the lower one-third is hole-free, preventing secondary leakage of groundwater and quickly draining it away. The product is used in railway construction, highway construction, airport runways, golf courses, soccer fields, large lawns, landscaping, highways, landfill sites, retaining walls, and other large-scale underground drainage projects such as tunnels. It is lightweight, easy to transport and operate. It has a wide temperature range adaptation. It boasts excellent weather resistance (anti-aging) and a long service life. It has strong impact resistance and excellent chemical corrosion resistance. Its water collection capability is 5 to 10 times that of similar products. The fluid flow rate is 2 to 3 times faster than that of steel or concrete pipes or corrugated pipes of the same diameter. It quickly drains collected water to prevent soil and water erosion. The bottom is hole-free, facilitating rapid water drainage and preventing secondary leakage.