Garret diagrams (Garret tables for irrigation design) are used to determine:
Choose the correct answer
Canal discharge from rainfall data
Trapezoidal section dimensions for canals designed on Kennedy theory
Tube well yield
Crop water requirements
Correct Answer
B. Trapezoidal section dimensions for canals designed on Kennedy theory
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Garret diagrams / tables give trapezoidal canal section dimensions (top width, bottom width, depth, side slopes, velocity) designed using Kennedy theory and Manning equation, for given discharge and silt factor. They save iterative design calculations.
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