Agriculture Reference
In-Depth Information
Most widely used and useful performance indicator for sprinkler irrigation
system is “Distribution Uniformity.” The distribution uniformity (DU) can be
DU
=
f
(
P
,
P
,
S
,
d
n
, WDP, WS)
(4.31)
where
=
P
the pressure available at the sprinkler
=
P
variation of the pressure in the operating set or along the moving lateral
=
S
spacings of the sprinklers along the lateral (and between laterals) or the
spacings between travelers
d
n
=
nozzle diameter, which influences the discharge
q
s
and wetted diameter
D
w
(and the coarseness of water drops) for a given
P
WDP
=
water distribution pattern of the sprinkler and
WS
=
wind speed and direction.
All the above variables are set at the design stage (including a forecasted WS).
Recordable Information During Evaluation
Numerous information should be collected to enable effective comparisons between
systems and more detailed analysis. The information required includes the
following:
•
Traveler location
•
Description of traveler
•
Description of gun
•
Angle of gun rotation
•
Nozzle type
•
Nozzle diameter
•
Length of run
•
Lane spacing
•
Run duration (start and finish times)
•
Pump details
Measurements That Should Be Taken
The measurements that should be made in the performance test
include the
following:
•
Sprinkler spacing and pattern
•
Number of sprinklers
•
Nozzle and tail jet diameters
•
Application rate
•
Irrigation duration
•
Sprinkler height
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