Question

The discharge available from a tube well is $140m^3/hr$. Assuming $10$ hours of pumping per day for $350$ days in a year. then the culturable area that this tube well can command is____hectares.
[Take the intensity of irrigation as 45% and average water depth required for the Rabi and Kharif crops as 500 mm]

• A. 217.77

Answer 1

The correct option is A 217.77
If $x$ is the culturable area in hectares which this tube well can command then the total quantity of water required = Total quantity of water available from the tube well per year

$\Rightarrow (x\times {10}^4\times \frac{500}{1000})m^3=(140\times 10)m^3$

$\Rightarrow x=\frac{140\times 10\times 350\times 1000}{{10}^4\times 500}=98hectares$

Total area that cultivated = 98 hectares
Intensity of irrigation = 45%

So. CCA (Culturable Command Area)
$=\frac{98}{0.45}=217.77hectares$