TM 5-818-1 / AFM 88-3, Chap. 7
ter through a specimen under known hydraulic gradient, i.
manner is the permeability in a horizontal direction. The
Typical permeability values, empirical relationships, and
vertical permeability of natural soil deposits is affected by
methods for obtaining the coefficient of permeability are
stratification and is usually much lower than the
shown in figure 3-5. Field pumping tests are the most
reliable means of determining the permeability of natural
soil deposits (para 4-5). Permeability obtained in this
U. S. Army Corps of Engineers
Figure 3-1. Typical CE 55 compaction test data.