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The duty of water is 1420 ha/cumec for a crop whose base period is 60 days. Calculate the delta for the given details.

  • A.0.365 m
  • B.0.423 m
  • C.0.542 m
  • D.0.611 m

Answer: A

Duty D (ha/cumec), base period B (days) and delta Δ (m) are related by \(\Delta = 8.64\,B/D\). The constant 8.64 comes from converting 1 cumec flowing for one day (86,400 m\(^3\)) into hectare-metres. Therefore

\[ \begin{aligned} \Delta = \frac{8.64 \times 60}{1420} \\ &= 0.365\ \text{m} \end{aligned} \]

The values 0.423, 0.542 and 0.611 m result from using the wrong base period or the wrong constant in the relation, for example forgetting that the duty is expressed for the whole base period of 60 days.

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