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
functionally expressed as (Pereira, 1999 )
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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