Permeability Test for Granular Soils (Constant-Head Method) - Soil Properties: Testing, Measurement, and Evaluation - page 253

Figure 18-1 Constant-Head Permeameter [1]

SAMPLE [1] (1) A representative sample of air-dried granular soil, containing less

than 10% of the material passing the 0.075-mm (No. 200) sieve and
equal to an amount sufficient to satisfy the requirements prescribed
in (2) and (3) below shall be selected by the method of quartering.

(2) A sieve analysis (ASTM Method D 422, for Particle-Size Analy-
sis of Soils; see Chapter 10) shall be made on a representative sam-
ple for the complete soil prior to the permeability test. Any particles
larger than 19 mm ( 3 ⁄ 4 in.) shall be separated out by sieving (ASTM
Method D 422). This oversize material shall not be used for the
permeability test, but the percentage of the oversize material shall
be recorded.

Note 1 —In order to establish representative values of coeffi-
cients of permeabilities for the range that may exist in the