UPSIDE-DOWN MICRO-EMITTERS HANDBOOK
11
MICRO-SPRINKLER/EMITTER SELECTION
EXAMPLE
a b c d e
Net application
measurements
[mm]
Average net
application
[AVG]
Measurements [mm] -
average net application
= application deviations*
Average
deviation from
average net
application %CU
5.14
91.35 / 20 = 4.57
0.57
7.29 / 20 = 0.36 1 - (0.36 / 4.57) = 92.12
5.06 0.49
5.02 0.45
4.99 0.42
4.87 0.30
4.87 0.30
4.83 0.26
4.77 0.20
4.75 0.22
4.73 0.24
4.70 0.23
4.62 0.05
4.41 0.16
4.40 0.17
4.38 0.19
4.26 0.31
4.25 0.32
4.12 0.45
3.82 0.75
3.36 1.21
Sum:
91.35
Sum:
7.29
*Application deviations are always recorded as positive numbers, whether the result is lower or higher
than the average net application [AVG].
Distribution uniformity (%DU)
The %DU is a measurement of uniformity, based on comparison of the driest 25% of the surveyed area
with the overall average net application, as a percentage.
%DU = (average of the lowest 25% / overall average) x 100
A perfectly uniform application is represented by a DU of 100%.
A less uniform application is represented by a lower percentage:
For micro-sprinkler/emitter irrigation of protected crops:
90% or higher Excellent uniformity
85% to 90% Very good uniformity
Lower than 85% Acceptable for certain low-value crops only
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