Product Manual

Page 20
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10.3 See Appendix X1 for information on the determination of the moisture pattern.
11. Precision and Bias
11.1 No statement on precision and bias can be made due to the variability in soils
tested and in the types of liquids that might be used in this test method. Because
of the many factors related to the soils, as well as the liquids that may affect the
results, the recorded infiltration rate should be considered only as an index value.
APPENDIX
(Nonmandatory Information)
X1. DETERMINATION OF MOISTURE PATTERN
X1.1 Although not considered a required part of the test method, the determination of the
moisture pattern in the moistened soil beneath the Turf-Tec infiltration rings commonly
provides information useful in interpreting the movement of liquid through the soil profile.
For example, horizontal liquid movement may be caused by lower-permeability layers and
will be identified by a lateral spreading of the wetted zone. Thus, the exploration of the soil
moisture pattern below an infiltration test in an unfamiliar area may identify subsurface
conditions that may have affected the test and later applications of the data.
X1.2 If the investigator wishes to make such a study, dig a trench so that one wall of the
trench passes along the center line of the former position of the rings. Orient the trench so
that the other wall is illuminated by the sun, if the day is sunny. If feasible, dig the trench
large enough to include all of the newly moistened area. Collect samples from the shaded
wall of the trench for determination of water content. If preferred, an auger, such as the
orchard barrel type, may be used to determine the approximate outline of the moistened
area below the rings and to collect samples for water content. A Turf-Tec Moisture sensor
can also be used to determine soil moisture percentages from www.turf-tec.com.
X1.3 Plot the visibly moistened area on graph paper or on the cross-section part of the
report form. If samples were collected and water contents were determined, contours of
water content also can be plotted on the graph. This data can be inserted into the Excel
spreadsheet also contained on the enclosed disk or CD.