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Mitigation |
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Action taken to avoid, reduce the severity of, or eliminate an adverse impact. |
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Modification/Repair Type |
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A data field used to summarize the type of modification (change to a dam) or repair (work performed to remedy damage that occurred to a dam or its apputenances) that was implemented. |
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Modified homogeneous earthfill dam |
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A homogeneous earthfill dam that uses pervious material specially placed in the embankment to control seepage. See embankment dam.
Modified Mercalli scale. An earthquake intensity scale which has twelve divisions |
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Modified Mercalli scale |
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An earthquake intensity scale which has twelve divisions ranging from I (not felt by people) to XII (nearly total damage). For more information on the modified Mercalli scale, visit the U.S. Geological Survey National Earthquake Information Center. |
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Moisture content |
water content |
The ratio of the weight of water in a soil sample to the weight of the dry soil, expressed as a percentage. See optimum moisture content. |
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Monomictic lakes |
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Warm- water lakes which turn over annually, usually in winter, and where the temperature never falls below 4 degrees C. |
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Morning glory spillway |
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A circular or glory hole form of a drop inlet spillway. Usually free standing in the reservoir and so called because of its resemblance to the morning glory flower. |
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MS connectors |
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Surface delays for use when shooting with detonating cord. |
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Multiple arch dam |
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A buttress dam, the upstream part of which comprises a series of arches. |
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Multiple-purpose reservoir |
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A reservoir planned to operate for more than one purpose. |
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Multipurpose dam |
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A dam constructed for two or more purposes (e.g. storage, flood control, navigation, power generation, or recreation.) |
