Stepwells

There are some rock types, sandstones and conglomerates for example, that are sufficiently porous to retain rainwater directly as well as that transported through soils and by rivers.

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In parts of India the rainy season separates long dry intervals. Old cultures there have built permanent step-wells to access the hidden ground water.

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Many steps have become centres of social value and tradition. The excavations still fill-up after heavy rains.