Irrigation Engineering
For a unique design of a channel by Kennedy's theory

All of these
Its breadth must only be known
Its depth must only be known
Its breadth and depth ratio must only be known

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Irrigation Engineering
Effective precipitation for a crop may be defined as

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

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