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In the western United States, individual streams or watersheds have their own conversion factors. NAVD 88 is generally higher than NGVD 29, so the conversion factor will be a positive number.
Maps were prepared with elevations based on mean Sea Level Datum of 1929. In the 1970s, the name was changed to the National Geodetic Vertical Datum (NGVD) of 1929. One of the reasons for the name change was that it was found that the sea is actually not level.
Conversion between NAVD 88 and the commonly used NGVD 29 varies spatially; however, over most of the study area the following conversion can be used: NGVD 29 = NAVD 88 3.6 feet. This conversion generally is accurate within about 0.5 feet for 95 percent of the study area.
National standard reference datum for elevations, formerly referred to as Mean Sea Level (MSL) of 1929. NGVD 1929 may be used as the reference datum on some Flood Insurance Rate Maps (FIRMs).
If you need to convert an estimated elevation from NAVD 1988 to NGVD 1929, use the Citys general conversion of +. 91 feet. For example 17.0 feet in NAVD 88 becomes 17.91 feet NGVD 29. NOTE: This method is an approximation to determine the elevation differences between the datums.

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However, Mean Sea Level (MSL), a tidal datum that pertains to local mean sea level, should not be confused with or substituted for the fixed datums of NGVD 29 or NAVD 88.
If an elevation certificate is using the 1929 datum, 1.3 feet must be subtracted from any elevation listed to come up with the current 1988 datum-based elevation. A conversion calculator is available on the National Geodetic Surveys website.