Product Manual

Page 11
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5.1 This test method is useful for field measurement of the infiltration rate of soils.
Infiltration rates have application to such studies as liquid waste disposal, evaluation
of potential septic-tank disposal fields, leaching and drainage efficiencies, irrigation
requirements, water spreading and recharge, and canal or reservoir leakage, among
other applications.
5.2 Although the units of infiltration rate and hydraulic conductivity of soils are similar,
there is a distinct difference between these two quantities: They cannot be directly
related or reliably estimated unless the hydraulic boundary conditions are known
(such as hydraulic gradient andthe extent of lateral flow of water).
5.3 The purpose of the outer ring is to promote one-dimensional vertical flow beneath the
inner ring.
5.4 Many factors affect the infiltration rate, for example the soil structure, soil layering,
condition of the soil surface, degree of saturation of the soil, chemical and physical
nature of the soil and of the applied liquid, head of the applied liquid, temperature of
the liquid, and diameter and depth of embedment of rings. Thus, tests made at the
same site are not likely to give identical results and the rate measured by the test
method described in this standard is primarily for comparative use.
5.5 Some aspects of the test, such
as the length of time the tests
should be conducted and the head
of liquid to be applied, must depend
upon the experience of the user,
the purpose for testing, and the
kind of information that is sought.
6. Apparatus
6.1 Turf-Tec International
Infiltrometer Rings—Cylinders
approximately 200 mm (20 in.) high
and having diameters of about 150
and 300 mm (6 and 12 inch) (See Figure 1)
6.2 Driving Plate—Disks of 2.6mm (1 in.) thick plywood, preferably having a recessed
groove about 10 mm (0.4 in.), should be made for the cross braces on top of the Turf-
Tec Infiltration rings, allowing the wooden driving cap to sit flush upon the top cross
braces of the Infiltration rings while also touching the surface of the rings. The driving
caps should be slightly larger than those of the Infiltrometer rings, or about 25 inches
in diameter. The Turf-Tec International IN6-W Driving Plates are specially designed
to fit over the IN8P-W Infiltration rings and cross braces. (See Figure 3)
6.3 Driving Equipment—A 1 kg (2.2 lb.) dead blow hammer, the Turf-Tec IN6 Driving
Plates and a 600 or 900 mm (2 or 3 ft.) length of wood approximately 50 by 100 mm
or 100 by 100 mm (2 by 4 in. or 4 by 4 in.), or a jack and reaction of suitable size.
(The jack method is preferred)
Figure 1
IN8P-W Turf-Tec 6 and 12 inch Infiltration
rings and Mariotte Tubes