Why is tank irrigation losing its popularity?

They are dependant on rainwater and groundwater.

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Rivers used by this irrigation are non perennial.

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They are only dependant on rainwater.

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Tanks are extremely expensive and takes decades to build.

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Solution

The correct options are
B Rivers used by this irrigation are non perennial.
C They are only dependant on rainwater.
In recent years, the area under tank irrigation has slowly decreased. This is because the tank system is non-perennial, and only dependant on rainwater.

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