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Roller compacted concrete |
RCC |
A mixture of cement, water, and aggregate compacted by rolling. |
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Roller gate |
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A gate rolled up or down inclined supporting rails by a hoist through sprocket chains around the ends of a cylinder. |
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Rolling |
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A method of compacting soil using a sheepsfoot roller or a smooth drum roller. |
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Root zone |
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The area where a low- angle thrust fault steepens and descends into the crust. |
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Rough fish |
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A nonsport fish. |
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Rubble dam |
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A masonry dam in which the stones are unshaped or uncoursed. See dam. |
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Run |
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Seasonal upstream migration of anadromous fish. |
