Performance Evaluation of Irrigation Projects - Practices of Irrigation and On-farm Water Management - page 111

Chapter 4
Performance Evaluation of Irrigation Projects
Contents
4.1 Irrigation Efficiencies ............................ 112
4.1.1 Application Efficiency ......................... 112
4.1.2 Storage Efficiency/Water Requirement Efficiency ............. 114
4.1.3 Irrigation Uniformity .......................... 114
4.1.4 Low-Quarter Distribution Uniformity
(or Distribution Uniformity) ....................... 115
4.2 Performance Evaluation ........................... 116
4.2.1 Concept, Objective, and Purpose
of Performance Evaluation ....................... 116
4.2.2 Factors Affecting Irrigation Performance ................. 117
4.2.3 Performance Indices or Indicators .................... 118
4.2.4 Description of Different Indicators .................... 120
4.2.5 Performance Evaluation Procedure ................... 126
4.2.6 Performance Evaluation Under Specific Irrigation System ......... 128
4.2.7 Improving Performance of Irrigation System ............... 134
Relevant Journals ................................ 137
Relevant FAO Papers/Reports ........................... 137
Questions .................................... 137
References ................................... 137
Any water applied above that needed to grow a crop is inefficient use of water.
In order to determine how much irrigation water to apply, it is needed to estimate
irrigation efficiency. There are many definitions of irrigation efficiency. Which one
to use depends on which aspect one is interested in. Efficiency can be measured at
the scale of a whole catchment, at the individual plant scale, and at almost any level
in between. The scale of measurement depends on the focus of the person doing the
measurement. A range of issues affect irrigation efficiency.
For successful design, implementation, and execution of command area devel-
opment programme, systematic evaluation of various components of the existing
system is necessary. Adequate monitoring and evaluation of performance are needed