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Soil quality. Determination of the water-retention characteristic. Laboratory methods
This document specifies laboratory methods for determination of the soil water-retention characteristic.
This document applies only to measurements of the drying or desorption curve.
Four methods are described to cover the complete range of soil water pressures as follows:
Method using sand, kaolin or ceramic suction tables for determination of matric pressures from 0 kPa to –50 kPa;
Method using a porous plate and burette apparatus for determination of matric pressures from 0 kPa to –20 kPa;
Method using a pressurized gas and a pressure plate extractor for determination of matric pressures from –5 kPa to –1 500 kPa;
Method using a pressurized gas and pressure membrane cells for determination of matric pressures from –33 kPa to –1 500 kPa.
Guidelines are given to select the most suitable method in a particular case.
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