The various types of irrigation efficiencies are given below:
1. Water Conveyance Efficiency: It is the ratio of water delivered to field (Wf) to the water diverted from reservoir (W) .
Mathematically it is given as:
ηc=| Water Delivered to field |
| Water diverted from reservior |
Water diverted from reservoir – Water delivered to field = seepage loss in canal + Evaporation from canal.
2. Water application Efficiency: It is the ratio of water stored in the root zone (Ws) to the water delivered to field
(Wf) .
Mathematically it is given as:
ηa=| Water stored in the root zone |
| Water Delivered to field |
Water delivered to field – Water stored in the root zone = Runoff + Evaporation
3. Water Used Efficiency: It is the ratio of water used consumptively to the water delivered in the field.
ηu=| Water used consumptively |
| Water Delivered to field |
Water Used = Water stored
(Ws) – leaching – other requirements
4. Water Storage Efficiency: It is the ratio of water actually stored in the root zone and water which is to be stored in the root zone to bring the water content to its field Capacity.