Which among the following are used to conserve water?

Septic tank

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Percolation tank

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Check dams

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Contour trench

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Solution

The correct option is D Contour trench
Percolation tanks, contour trenches and check dams are constructed to conserve water. They help in ground water recharge and prevent soil erosion.
On the other hand, septic tank is an underground sewage system.

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