MIL-HDBK-1005/16
Table 9
Soil and Site Factors That Restrict Mound Systems
Permeable
Soils with
Permeable Soils
Restricting
Slowly
Pervious
with High
Factors
Permeable Soils
Bedrock
Water Table
Percolation
60-120 min/in.
3-60 min/in.
3-60 min/in.
rate(a)
(24 to 48
1.1 to 24
(1.1 to 24
min/cm)
min/cm)
min/cm)
Depth to
24 in.
24 in.
24 in.
previous rock
(61 cm)
(61 cm)
(61 cm)
Depth to high
24 in.
24 in.
24 in.
water tables
(61 cm)
(61 cm)
(61 cm)
Depth to
60 in.(b)
60 in.
60 in.(b)
impermeable
(152 cm)
(152 cm)
(152 cm)
soil layer or
rock strata
Depth to 50%
24 in.
24 in.
24 in.
by volume rock
(61 cm)
(61 cm)
(61 cm)
fragments
Maximum slope
6%
6-12%(c)
6-12%(c)
(a) Percolation test depth at 24 inches, 12 inches, and 24 inches
(61 cm, 30 cm, and 61 cm) for slowly permeable, shallow
soils, and high water table soils, respectively, unless there
is a more restrictive horizon above. If perched water is at
24 inches (61 cm), test depth should be held to 16 inches
(40 cm).
(b) See discussion in text (par. 6.4.5).
(c) For percolation rate of 3 to 29 min/in. (1.1 to 11 min/cm),
maximum slope is 12 percent and for 30 to 60 min/in. (12 to
24 min/cm), maximum slope is 6 percent.
99
Previous Page
