<p>This document specifies laboratory methods for determination of the soil water-retention characteristic.</p>
<p>This document applies only to measurements of the drying or desorption curve.</p>
<p>Four methods are described to cover the complete range of soil water pressures as follows:</p>
<p>a) method using sand, kaolin or ceramic suction tables for determination of matric pressures from 0 kPa to −50 kPa;</p>
<p>b) method using a porous plate and burette apparatus for determination of matric pressures from 0 kPa to −20 kPa;</p>
<p>c) method using a pressurized gas and a pressure plate extractor for determination of matric pressures from −5 kPa to −1 500 kPa;</p>
<p>d) method using a pressurized gas and pressure membrane cells for determination of matric pressures from −33 kPa to −1 500 kPa.</p>
<p>Guidelines are given to select the most suitable method in a particular case.</p>
Registration number (WIID)
68256
Scope
<p>This document specifies laboratory methods for determination of the soil water-retention characteristic.</p>
<p>This document applies only to measurements of the drying or desorption curve.</p>
<p>Four methods are described to cover the complete range of soil water pressures as follows:</p>
<p>a) method using sand, kaolin or ceramic suction tables for determination of matric pressures from 0 kPa to −50 kPa;</p>
<p>b) method using a porous plate and burette apparatus for determination of matric pressures from 0 kPa to −20 kPa;</p>
<p>c) method using a pressurized gas and a pressure plate extractor for determination of matric pressures from −5 kPa to −1 500 kPa;</p>
<p>d) method using a pressurized gas and pressure membrane cells for determination of matric pressures from −33 kPa to −1 500 kPa.</p>
<p>Guidelines are given to select the most suitable method in a particular case.</p>
