Discussion
What is the discharge capacity required at the outlet to irrigate 2200 hectares of sugarcane with the Kor depth of 14 cm and the Kor period of 20 days?
Answer: C
The Kor depth is the depth of water to be supplied during the Kor period, the first and most critical watering of a crop. The volume needed is the area times the depth: 2200 ha = 22 x 10\(^6\) m\(^2\), so the volume is \(22 \times 10^6 \times 0.14 = 3.08 \times 10^6\) m\(^3\). The Kor period of 20 days is 1.728 x 10\(^6\) s, so the discharge is
\[ \begin{aligned} Q = \frac{3.08 \times 10^6}{1.728 \times 10^6} \\ &= 1.78\ \text{m}^3/\text{s} \end{aligned} \]The options 1.56, 1.63 and 1.91 m\(^3\)/s would come from taking the depth or the period slightly wrong; they do not correspond to the data given.
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