The SATURO and the double-ring infiltrometer are both ring infiltrometers that infiltrate water from the surface into soils. The main difference is how they deal with three-dimensional flow in the Kfs calculation. The SATURO uses the multiple-ponded head analysis approach to get a more direct estimation of alpha, which is used to determine how the soil pulls the water laterally. The double-ring infiltrometer uses a larger outer ring to act as a buffer from three-dimensional flow. This requires more water, and literature suggests that it doesn’t perform well. Also, with a double-ring infiltrometer, there is still a need to estimate alpha in the equations. This is typically done from a look-up table based on soil type and often results in error.
We compared SATURO readings against double-ring infiltrometer readings on the METER soccer field at seven different locations. This article shows the results.
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