What is emission uniformity?
Emission Uniformity or EU is a term strictly applied to microirrigation systems. Emission Uniformity is a more complicated equation than distribution uniformity and involves measured emitter flows, the number of emitters per plant, and the coefficient of manufacturing variation. Like DU, EU can be calculated using different basis, the lowest 25% of measured emitter flows, lowest 1/8 of emitter flows, absolute lowest flow, etc. The equation is: EU(%) = 100 * (1.0 – 1.27 / n ½ * Cv) * Qn / Qa where: EU(%) = Emission Uniformity as a percent n = number of emitters per plant Cv = coefficient of manufacturing variability Qn = the average (or absolute minimum) flow of the basis (i.e. if the basis was low 1/4, then this would be the average of the lowest 25% emitters measured) Qa = average emitter flow Looking at the equation one can see as Cv is higher, then the EU is lower. That is, as the variability of the manufacturing process increases, the expected uniformity in the field decreases. Con
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