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Why are there two different elevations on a benchmark data sheet? Which one is related to Mean Sea Level?

April 26, 2017benchmark Data different elevations level mean sea Sheet

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Why are there two different elevations on a benchmark data sheet? Which one is related to Mean Sea Level?

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Very simply stated, NGVD29 is very close and can be considered Mean Sea Level. NAVD88 has no relationship to Mean Sea Level in this area. NAVD88 differs from NGVD29 by about 2.34’ in Orange County.