Semicircular bund - Wikipedia
A demi-lune in Burkina Faso. A semi-circular bund (also known as a demi-lune or half-moon) is a rainwater harvesting technique consisting in digging semilunar holes in the ground with the opening perpendicular to the flow of water.[1][2] Background[edit] These holes are oriented against the slope of the ground, generating a small dike in the curved area with the soil from the hole itself, so they
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