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- (Abbrev. BM) - In hydrologic terms, a permanent point whose known elevation is tied to a national network. These points are created to serve as a point of reference. Benchmarks have generally been established by the USGS, but may have been established by other Federal or local agencies. Benchmarks can be found on USGS maps.
NOAA National Weather Service - Cite This Source - This Definition
- Backsight, ELEV, Foresight, Mean Sea Level, MSL, QN, Turning Point