Question

The transplantation of rice requires 10 days and total depth of water required during transplantation is 48 cm. During transplantation, there is an effective rainfall (useful for irrigation) of 8 cm. The duty of irrigation water (in hectares/cumec) is:

• A. 612
• B. 216
• C. 300
• D. 108

Answer 1

The correct option is B 216

Days = 10 day
Effective depth for transplantation
= 48 - 8 = 40 cm
$\Rightarrow$ Duty is an area in hectare which is irrigated with per $m^3$/s of discharge.

We know that;

$Duty=\frac{8.64\times baseperiod}{\Delta }$

$Duty=\frac{9.64\times 10}{0.4}=216ha/cumec$