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A field was supplied water from an irrigation tank at a rate of 120 L/s to irrigate an area of 2.5 hectares. The duration of irrigation is 8 hours. It was found that the actual delivery at the field, which is about 4 km from the tank, was 100 L/s. The runoff loss in the field was estimated as 800 m³. The application efficiency in this situation is
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- 62%
- 72%
- 76%
- 80%
Correct Option: B
Water supplied to field in 8 hrs (at 100 L/s)
= 100 × 8 × 60 × 60 = 2880 × 10³ L = 2880 m³
Runoff loss = 800m³
∴ Water stored is root zone = 2880 – 800 = 2080 m³
Water application efficiency, ηa
| ηa = | ||
| water supplied to field |
| = | × 100 = 72.22% | |
| 2800 |
