Irrigation Engineering
Effective precipitation for a crop may be defined as

Available water stored in soil within root zone of the crop
Total precipitation minus the loss due to infiltration
Total precipitation minus the loss due to evaporation
Total precipitation during the crop period

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Irrigation Engineering
Which one of the following statements is correct?

The canal system and the drainage system are complementary
The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream
All listed here
The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land

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