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Hydrology & Irrigation

Duty and Delta-Part-1

An agricultur...

Question

An agricultural land of 437 hectare is to be irrigated for a particular crop. The base period of the crop is 90 days and the total depth of water required by the crop is 105 cm. If a rainfall of 15 cm occurs during the base period, the duty of irrigation water is

A

437 hectare/cumec

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B

486 hectare/cumec

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C

741 hectare/cumec

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D

864 hectare/cumec

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Solution

The correct option is D 864 hectare/cumec
Base period,
B = 90 days

Total depth of water required by crop
= 105 cm

Rainfall = 15 cm

So, depth of water provided by irrigation system,
$Δ = 105 c m - 15 c m$
$= 90 c m$

$Duty, D = \frac{8.64 B}{Δ} = \frac{8.64 \times 90}{0.9}$

= 864 hectare/cumec

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