Agriculture Reference
In-Depth Information
•
To identify the causes of irrigation inefficiencies
•
To identify the problem/weak point of irrigation management
•
To diagnose the water management standard of the irrigation project
•
To determine the main principles leading to an improvement of irrigation
performance
4.2.1.3 Purposes
The purpose of performance assessment is to measure, through consistently applied
standards, various factors that indicate either by comparison across systems whether
a system is performing 'well' or 'badly' in a relative sense or by a system-specific
analysis to see how the system is operating in relation to its own objectives. The
specific purposes are as follows:
•
to improve irrigation performance
•
to improve management process
•
to improve sustainability of irrigated agriculture
4.2.1.4 Benefits of Evaluation
Evaluation leads to the following benefits:
•
Improved quality of activities
•
Improved ability of the managers to manage the system
•
Savings of water and energy
•
Ensure maximum production/benefit and minimum cost
4.2.2 Factors Affecting Irrigation Performance
The performance of an irrigation system at field scale depends on several design
variables, management variables, and system variables
or
factors. These factors
characterize an irrigation event. Mathematically, it can be expressed as
P
ir
=
f
(
q
in
,
A
,
L
,
W
,
N
,
S
0
,
I
n
,
t
cutoff,
S
w
,
D
ru
,
P
,
R
d
,ET,
W
.....),
(4.8)
where
P
ir
=
performance of an irrigation event
f
function
q
in
=
=
inflow rate or application rate (to the furrow, or per unit width of border
or basin, or per emitter or sprinkler)
A
=
sectional form of the unit plot to be irrigated (specially for furrow)
L
=
length of run of the flow
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