ISO 10776:2012 describes a method for determining the water permeability characteristics of geotextiles or geotextile-related products normal to the plane when subjected to specific normal compressive loads.
DS/EN ISO 10776:2012 history
2012DS/EN ISO 10776:2012 Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the plane, under load