Geotextiles and geotextile-related products. Determination of water permeability characteristics normal to the plane, without load

BS EN ISO 11058:2010 Geotextiles and geotextile-related products. Determination of water permeability characteristics normal to the plane, without load

BS EN ISO 11058 specifies two test methods for determining the water permeability characteristics of a single layer of geotextile or geotextile-related product normal to the plane:

a) The constant head method;

b) The falling head method.

If the full permeability characteristics of the geotextile or geotextile-related product have previously been established, then for control purposes it can be sufficient to determine the velocity index at a head loss of 50 mm only.

Contents of BS EN ISO 11058:

Foreword

1 Scope

2 Normative references

3 Terms and definitions

4 Test specimens

4.1 Handling

4.2 Selection

4.3 Number and dimensions

4.4 Condition of specimens

5 Constant head method

5.1 Principle

5.2 Apparatus

5.3 Procedure

5.4 Calculation and expression of results

6 Falling head method

6.1 Principle

6.2 Apparatus

6.3 Procedure

6.4 Calculation and expression of results

7 Test report

Annex A (informative) Determination of the correction factor, RT, to a water temperature of 20 °C

Annex B (informative) Relationship between head loss and flow velocity

Annex C (informative) Velocity index

Annex D (informative) Experimental data and calculations