Improved apparatus for measuring hydraulic conductivity at low water content
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Abstract
A modification of the steady-state centrifuge method (SSCM) for unsaturated hydraulic conductivity (K) measurement improves the range and adjustability of this method. The modified apparatus allows mechanical adjustments to vary the measured K by a factor of 360. In addition, the use of different flow-regulating ceramic materials can give a total K range covering about six orders of magnitude. The increment of K adjustment is a factor of about 1.6. This makes it potentially useful for measuring targeted values of K or, through a trial and error procedure, of water content (θ). The range extension afforded by this modification has led to the lowest steady-state K measurement to date: 1.1 × 10−11 m/s at θ of 0.068 m3water/m3 for a sandy soil of the Delhi series (mixed, thermic Typic Xeropsamment).
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Improved apparatus for measuring hydraulic conductivity at low water content |
| Series title | Soil Science Society of America Journal |
| DOI | 10.2136/sssaj1992.03615995005600060017x |
| Volume | 56 |
| Issue | 6 |
| Year Published | 1992 |
| Language | English |
| Publisher | ACSESS |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 4 p. |
| First page | 1758 |
| Last page | 1761 |
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