International Organization for Standardization (ISO)
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ISO 15709:2002
Scope
This International Standard gives a simplified theory of the physics of soil water in the unsaturated zone and defines a set of terms, quantities, units and symbols used in the field of soil physics investigation of the unsaturated zone.
This International Standard is applicable only to standards on soil physical investigations of the unsaturated zone (including swelling soils) elaborated within ISO/TC 190. This International Standard specifically excludes macropore flow.
ISO 15709:2002 history
2002ISO 15709:2002 Soil quality - Soil water and the unsaturated zone - Definitions, symbols and theory