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ISO 11058:2019
Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the plane, without load
This document specifies two test methods for determining the water permeability characteristics of a single layer of geotextile or geotextile-related product normal to the plane:
a) the constant head method; and
b) the falling head method.
International Organization for Standardization [iso]