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Wells supplied with pumps can extract water from the aquifer.
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a layer of clay hidden beneath a layer of lighter top soil.
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Gravel for the garden path.
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A rounded stone formerly used in paving streets.
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The soldiers returned to the trenches.
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A railway embankment.
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verb - 1. Dig a large hole for the plant, then backfill with soil and compost. 2. Finally, backfill the trench. / noun - some of the fluorite produced from the lead mines was used as backfill underground.
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Concrete foundations.
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The explosion damaged the bridge, but the substructure remained intact.
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