The Culturable Command Area for a distributed channel is 20,000 hectares. Wheat is grown in the entire area and the intensity of irrigation is 50%. The kor period for wheat is 30 days and the kor water depth is 120 mm. The outlet discharge for the distributary should be

2.85 m^{3} / s

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3.21 m^{3} / s

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4.63 m^{3} / s

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5.23 m^{3} / s

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Solution

The correct option is C $4.63 m^{3} / s$
Area to be irrigated,
A = culturable command area ×
intensity of irrigation
= 20000 × 0.5
= 10000 hectare

Kor period,
t = 30 days
= 30 × 86400 s

Kor water depth,
d = 120 mm
= 0.12 m

Water supplied by distributary in kor period =
Water required by crop

Q × t = A × d

$Q \times 30 \times 86400 = (10000 \times 10^{4}) \times 0.12$

$\Rightarrow Q = 4.63 m^{3} / s$

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