What is distribution uniformity?
Distribution uniformity (DU) is a measure of how evenly water is applied across a field. If 4 inches of water infiltrates in one part of a field during an irrigation and 2 inches infiltrates in another, that is poor uniformity. There are many ways to calculate DU. One of the most common is termed the “low 1/4 DU”. DUlow 1/4 = average depth of infiltration in the 25% of the field receiving the least applied water average depth of infiltration in the entire field You might also see a DU determined using the average depth in the least-watered 1/8 of the field, or even using the lowest measured infiltration.
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