Permeability Test for Granular Soils (Constant-Head Method) - Soil Properties: Testing, Measurement, and Evaluation - page 264

walls of a permeameter afford different boundary conditions from in situ
soil. Finally, the hydraulic head in a permeameter may differ from the
field gradient.
Another concern is any effect on the permeability test from entrapped
air in the water. To avoid this, water to be used in the test should be
de-aired by boiling distilled water and keeping it covered and nonagitated
until used.

[1] ASTM, 2007 Annual Book of ASTM Standards , West Conshohocken,

PA, 2007. Copyright, American Society for Testing and Materials, 100
Barr Harbor Drive, West Conshohocken, PA 19428-2959. Reprinted
with permission.

REFERENCES

[2] Joseph E. Bowles, Engineering Properties of Soils and Their Measurement ,

2d ed., McGraw-Hill Book Company, New York, 1978.