ISO 11275:2004
Soil quality — Determination of unsaturated hydraulic conductivity and water-retention characteristic — Wind's evaporation method
ISO 11275:2004 specifies a laboratory method for the simultaneous determination in soils of the unsaturated hydraulic conductivity and of the soil water-retention characteristic. It is applicable only to measurement of the drying or desorption curve. Application of the method is restricted to soil samples which are, as far as possible, homogeneous. The method is not applicable to soils which shrink in the range of matric head 0 cm to -800 cm.
The range of the determination of the conductivity depends on the soil type. It lies between matric heads of approximately -50 cm and -700 cm.
The range of the determination of the water-retention characteristic lies between matric heads of approximately 0 cm and -800 cm.
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Soil quality — Determination of unsaturated hydraulic conductivity and water-retentio...
Contents Page
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Apparatus
6.1 Equipment for sampling undisturbed soil
6.2 Container and polyamide mesh
6.3 Balance
6.4 Tensiometer system
6.5 Equipment to install the tensiometers
6.6 Materials to create seals
6.7 Drying oven,
7 Procedure
7.1 Preparation and measurements
Subclause3 - 7.1.1 Sampling
Subclause3 - 7.1.2 Sample preparation
Subclause3 - 7.1.3 Measurements
7.2 Calculations
UntitledSubclause3 - 7.2.1 Calculate the average water content,
UntitledSubclause3 - 7.2.2 Calculate the average water content as a volume fraction of the who...
UntitledSubclause3 - 7.2.3 Calculate the mean pressure head in the soil sample using the follo...
UntitledSubclause3 - 7.2.4 Fit a continuous curve through all pairs
UntitledSubclause3 - 7.2.5 Calculate the estimated water content,
UntitledSubclause3 - 7.2.6 Repeat the calculations of
UntitledSubclause3 - 7.2.7 For interval
UntitledSubclause3 - 7.2.8 For interval
UntitledSubclause3 - 7.2.9 Calculate the unsaturated conductivity using Darcy's equation:
8 Expression of results
9 Accuracy
10 Test report
Bibliography
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Related Information
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BS 7755-5.2:1996
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BS EN ISO 11274:2019
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BS EN ISO 11275:2014
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Soil quality — Determination of unsaturated hydraulic conductivity and water-retentio...
Contents Page
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Apparatus
6.1 Equipment for sampling undisturbed soil
6.2 Container and polyamide mesh
6.3 Balance
6.4 Tensiometer system
6.5 Equipment to install the tensiometers
6.6 Materials to create seals
6.7 Drying oven,
7 Procedure
7.1 Preparation and measurements
Subclause3 - 7.1.1 Sampling
Subclause3 - 7.1.2 Sample preparation
Subclause3 - 7.1.3 Measurements
7.2 Calculations
UntitledSubclause3 - 7.2.1 Calculate the average water content,
UntitledSubclause3 - 7.2.2 Calculate the average water content as a volume fraction of the who...
UntitledSubclause3 - 7.2.3 Calculate the mean pressure head in the soil sample using the follo...
UntitledSubclause3 - 7.2.4 Fit a continuous curve through all pairs
UntitledSubclause3 - 7.2.5 Calculate the estimated water content,
UntitledSubclause3 - 7.2.6 Repeat the calculations of
UntitledSubclause3 - 7.2.7 For interval
UntitledSubclause3 - 7.2.8 For interval
UntitledSubclause3 - 7.2.9 Calculate the unsaturated conductivity using Darcy's equation:
8 Expression of results
9 Accuracy
10 Test report
Bibliography