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Meaning of BENCH MARK

Pronunciation:  bench mârk

WordNet Dictionary
[n]  a surveyor's mark on a permanent object of predetermined position and elevation used as a reference point
 Synonyms: benchmark
 See Also: point of reference, reference, reference point



Webster's 1913 Dictionary
\Bench mark\ (Leveling)
Any permanent mark to which other levels may be referred.
Specif. : A horizontal mark at the water's edge with
reference to which the height of tides and floods may be

Biology Dictionary
 Definition: A fixed, more or less permanent reference point or object of known elevation; the U.S. Geological Survey (USGS) installs brass caps in bridge abutments or otherwise permanently sets bench marks at convenient locations nationwide; the elevations on these marks are referenced to the National Geodetic Vertical Datum (NGVD), also commonly known as mean sea level (MSL); locations of these bench marks on USGS topographic maps are shown as small triangles; since the marks are sometimes destroyed by construction or vandalism, the existence of any bench mark should be field verified before planning work which relies on a particular reference point; the USGS or local state surveyors office can provide information on the existence, exact location and exact elevation of bench marks.
 Definition: a vertical datum-point usually at a known elevation above sea-level, to which mapped elevations may be related.
Thesaurus Terms
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