EN ISO 11274:2014

Foreword
Introduction
1 Scope
2 Definitions
3 Guidelines for choice of method
4 Sampling
5 Determination of the soil water characteristic
  using sand, kaolin and ceramic suction tables
6 Determination of soil water characteristic
  using a porous plate and burette
7 Determination of soil water characteristic by
  pressure plate extractor
8 Determination of soil water characteristic
  using pressure membrane cells
9 Precision
Annexes
Annex A (informative) - Construction of suction
        tables
Annex B (informative) - Bibliography

This International Standard specifies laboratory methods for determination of the soil water-retention characteristic. This International Standard 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: a) method using sand, kaolin or ceramic suction tables for determination of matric pressures from 0 kPa to - 50 kPa; b) method using a porous plate and burette apparatus for determination of matric pressures from 0 kPa to - 20 kPa; c) method using a pressurized gas and a pressure plate extractor for determination of matric pressures from - 5 kPa to - 1500 kPa; d) method using a pressurized gas and pressure membrane cells for determination of matric pressures from - 33 kPa to - 1500 kPa. Guidelines are given to select the most suitable method in a particular case.