Netafim SPINNET Handbook page 14

MICRO-SPRINKLER/EMITTER SELECTION
EXAMPLE
a
Net application
measurements [mm]
lowest 5%
Sum - entire area: 91.35
Sum - lowest 5%: 3.36
Conclusion: The three instances above demonstrate that each method of calculating distribution
uniformity produces a different result.
Method Value Level of distribution uniformity
%CU
92.12 Very good
%DU 86.65 Very good
SC 1.36 Acceptable for some low value crops
It is common practice among micro-sprinkler/emitter manufacturers to advertise the results of the %CU
method only, which are known to be the most flattering. Netafim™, however, insisting on strict standards
and zealous R&D procedures, tests its micro-sprinklers/emitters with all 3 methods and provides its
customers with the results of the most rigorous analyses.
14 UPSIDE-DOWN MICRO-EMITTERS HANDBOOK
b
Average net application
of the entire area [AVG]
5.14
5.06
5.02
4.99
4.87
4.87
4.83
4.77
4.75
4.73
4.70
91.35 / 20 = 4.57
4.62
4.41
4.40
4.38
4.26
4.25
4.12
3.82
3.36
c
Average net application of
the lowest 5% [AVG low]
3.36 / (20 x 5%) = 3.36
d
SC value
(4.57 / 3.36) = 1.36