Irrigation Engineering
The useful moisture of soil, is equal to its

Moisture content at permanent wilting point
Saturation capacity
Field capacity
Difference between filed capacity and permanent wilting point within the root zone of plants

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Irrigation Engineering
Which one of the following statements is correct?

All listed here
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
The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land

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