ISO and Related Standards for Geosynthetic Drainage Systems
Geosynthetic drainage system is evaluated under key standards to ensure optimal performance in filtration and drainage applications:
- EN ISO 12958:2020: Measures in-plane flow capacity (transmissivity) under specified pressures (e.g., 20 kPa) and hydraulic gradients (e.g., 1.0), ensuring the system can handle 2.1 L/(m·s) flow. This standard is critical for assessing drainage performance in geocomposites.
- EN ISO 10319:2015: Determines tensile strength (18 kN/m) and elongation of the nonwoven geotextiles, tested using a wide-width strip (200 mm) at controlled conditions (20°C ± 2°C, 65% ± 5% humidity).
- EN ISO 11058:2019: Assesses permeability normal to the plane, ensuring the geotextile’s filtration efficiency with 150-micron pores.
- ASTM D4716/D4716M-20: Complements ISO 12958 for in-plane flow testing, often used in North American applications.
- EN 13252:2016: Specifies characteristics for geotextiles in drainage systems, including filtration and separation, ensuring compatibility with soil retention and permeability requirements.
The system features two UV-stabilized polypropylene nonwoven geotextiles (minimum 0.75 mm thickness, 150-micron pores, 8.0 kN/m tensile strength) bonded to a “W” configuration core, providing a minimum thickness of 7.2 mm and a mass per unit area of 740 g/m². The UV stabilization, typically achieved with additives like carbon black or hindered amine light stabilizers, ensures durability against degradation, as noted in industry research. Applications include subsurface drainage, landfill leachate collection, and road base stabilization.[](https://www.sciencedirect.com/topics/materials-science/geotextile)
Detailed Specifications
| Minimum Thickness (mm) | Geotextile Thickness (mm) | Pore Size (micron) | Geotextile Tensile Strength (kN/m) | Total Tensile Strength (kN/m) | In-Plane Flow Capacity (L/m·s) | Mass per Unit Area (g/m²) | Material | Typical Applications | Test Standards |
|---|---|---|---|---|---|---|---|---|---|
| 7.2 | 0.75 (each) | 150 | 8.0 | 18 | 2.1 (at 20 kPa, i=1.0) | 740 | PP Nonwoven + “W” Core | Landfills, road drainage, retaining walls | EN ISO 12958:2020, EN ISO 10319:2015, EN ISO 11058:2019 |
Geosynthetic drainage system is engineered for efficient water flow and soil filtration, offering a lightweight, cost-effective alternative to traditional gravel drainage layers, with equivalent or superior performance.
ISO and Related Standards
- EN ISO 12958:2020: Measures in-plane flow capacity (transmissivity) under specified conditions (e.g., 20 kPa, hydraulic gradient of 1.0), confirming the 2.1 L/m·s flow capacity. This is critical for drainage geocomposites.
- EN ISO 10319:2015: Tests tensile strength (18 kN/m total, 8.0 kN/m per geotextile) and elongation using a 200 mm wide strip.
- EN ISO 11058:2019: Assesses permeability normal to the plane, ensuring filtration efficiency with 150-micron pores.
- ASTM D4716/D4716M-20: Complements ISO 12958 for in-plane flow testing, widely used in North America.
- EN 13252:2016: Specifies requirements for geotextiles in drainage systems, ensuring soil retention and permeability.
Additional Notes
- “W” Configuration: The longitudinal parallel channels enhance in-plane flow, making the system a lightweight alternative to gravel drainage (e.g., a 6 mm geocomposite can match a 300 mm gravel layer).
- Filtration: The 150-micron pore size balances soil retention and permeability, minimizing clogging risks.
- Comparison: The table focuses on a single product, as only one specification was provided. If multiple variants were needed, the chart and table could be expanded.