Feb 26, 2016

Feb 26, 2016

Feb 26, 2016

# Irrigation Efficiency - Definition and Its Types

## Definition

The ratio of the amount of water available (output) to the amount of water supplied (input) is known as Irrigation Efficiency. It is expressed in percentage.

## Types of Irrigation Efficiency

The following are the various types of irrigation efficiencies:

### (a) Water Conveyance Efficiency (ηc):

It is the ratio of the amount of water applied, to the land to the amount of water supplied from the reservoir. It is obtained by the expression,

ηc = Wl Wr × 100 Where, ηc = Water conveyance efficiency Wl = Amount of water applied to land Wr = Amount of water supplied from reservoir

### (b) Water Application Efficiency (ηa):

It is the ratio of the water stored in root zone of plants to the water applied to the land. It is obtained by the expression,

ηa = Wz Wl × 100 Where, ηa = Water application efficiency Wz = Amount of water stored in root zone Wl = Amount of water applied to land

### (c) Water Use Efficiency (ηu):

It is the ratio of the amount of water used to the amount of water applied. It is obtained by the expression,

ηu = Wu Wl × 100 Where, ηu = Water use efficiency Wu = Amount of water used Wl = Amount of water applied to land

### (d) Consumptive use Efficiency (ηcu):

It is the ration of the consumptive use of water to the amount of water depleted from the root zone. It is obtained by the expression, ηcu = Cu Wp × 100 Where,

ηcu = Consumptive use efficiency Cu = Consumptive use of water Wp = Amount of water depleted from root zone