ISO 12958‑1 is the first part in the multi-series of documents that is applicable to the geotextiles and geotextile-related products, for the determination of water flow capacity in their plane.
ISO 12958‑1 specifies a method for determining the constant-head water flow capacity within the plane of a geotextile or geotextile-related product.
ISO 12958‑1 describes the in-plane water flow index test, only applicable to factory-assembled products.
ISO 12958‑1 on geotextiles and geotextile-related products is relevant to:
In recent years, geotextiles have been used extensively as filters for drainage systems. With the index test, ISO 12958‑1 aims to examine the flow of water within the plane of a geotextile or geotextile-related product, which is measured under varying normal compressive stresses, with typical hydraulic gradients and with defined contact surfaces.
When evaluating an equivalent in-plane water flow capacity per unit width of the geocomposite, ISO 12958-1 specifies the contribution of the main layer (i.e. geotextile) and the spacing of the discrete draining elements (i.e. pipe) that must be considered.
If you are a geotechnical engineer, taking into account the methods and assessment recommended by ISO 12958-1, is important to determine porosity, permeability and permittivity of geocomposites, to achieve optimal hydraulic performance of geotextiles.
BS EN ISO 12958‑1:2020 together with BS EN ISO 12958‑2:2020, it supersedes BS EN ISO 12958:2010, which will be withdrawn on publication of BS EN ISO 12958‑2:2020. BS EN ISO 12958‑1:2020 includes some technical changes with respect to BS EN ISO 12958:2010. These include:
EN ISO 12958-1
ISO 12958-1