A drainage net (also referred to as geosynthetic drainage net or 3D drainage net) is an innovative engineered material designed to efficiently manage water flow, prevent hydrostatic pressure buildup, and enhance drainage performance in civil engineering, construction, and environmental projects. Typically structured as a three-dimensional network—composed of high-density polyethylene (HDPE) or polypropylene (PP) cores (forming open channels for water flow) and geotextile filters (bonded to one or both sides to retain soil particles while allowing water penetration)—it combines drainage efficiency with soil retention. Its key function is to create a continuous, unobstructed path for excess water (e.g., groundwater, rainwater, or seepage) to flow away from structures or soil layers, reducing moisture-related issues like erosion, foundation damage, or soil instability. Drainage nets are widely used in critical applications such as road and highway construction (managing subsurface water under pavements to prevent cracking), landfill liners and caps (directing leachate or rainwater to collection systems), retaining walls and slope stabilization (relieving hydrostatic pressure to prevent wall failure), basement and tunnel waterproofing (draining groundwater away from structures), and agricultural projects (managing soil moisture in crop fields or greenhouses). Unlike traditional drainage methods (e.g., gravel trenches or perforated pipes), drainage nets are lightweight, space-efficient (reducing the need for thick gravel layers), easy to install on uneven terrain, and resistant to clogging (thanks to their geotextile filters). They also meet international standards (e.g., ASTM, ISO) to ensure consistent flow capacity, tensile strength, and durability in harsh conditions (resisting chemicals, UV radiation, and temperature fluctuations). Whether for protecting infrastructure, stabilizing slopes, or optimizing agricultural water management, a high-quality drainage net is a cost-effective, reliable solution in modern engineering, delivering efficient water control and long-term performance.