If the water losses are more, the output and the efficiency is         

Explanation :

Irrigation Efficiency:

• Irrigation Efficiency is the ratio of the water output to the water input and is usually expressed in terms of percentage.
• Input minus output is nothing but losses, and hence, if losses are more, the output is less, and therefore efficiency is less.
• Hence, efficiency is inversely proportional to the losses.

Important Points Consumptive Irrigation Requirement

• Consumptive use of water by a crop is the depth of water consumed by the plant in the process of transpiration and evaporation, during crop growth.
• These two processes (i.e. transpiration and evaporation) are collectively termed evapotranspiration.
• Consumptive use of water by a crop is expressed as the depth of water per unit area for a specified period, such as days, months, or seasons.
• The value of the consumptive use of water is needed to calculate the irrigation requirement of the crop.

We know,

1. Consumptive Irrigation Requirements (CIR)

= Consumptive Use (Cu) – Effective Rainfall (Re)

2. Net Irrigation Requirement (NIR)

= CIR + other requirements such as leaching

3. Field Irrigation Requirements (FIR)

= NIR + Surface runoff losses + deep percolation losses

Or

\({\rm{FIR}} = \frac{{{\rm{NIR}}}}{{{\rm{Water\;application\;efficiency}}}}\)

NIR = FIR × Water application efficiency 

4. Gross Irrigation Requirements (GIR)

= FIR + Conveyance Losses (Seepage and Evaporation)

Or 

\({\rm{GIR}} = \frac{{{\rm{FIR}}}}{{{\rm{Water\;Conveyance\;efficiency}}}}\)