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NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico. It held fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski, Quebec, Canada.
However when Sea Level Datum of 1929 (MSL) and was superseded by the NGVD 29 the numbers didn't change; it was a name change only. So, the 29 ft lake elevation the CoE referenced . is . NGVD 29. To convert to NGVD 29 to NAVD 88 you simply add 3.6 feet. So the 29 ft lake elevation (MSL or NGVD 29) is 32.6 ft NAVD 88. For a good writeup on this, see:
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What is NAVD 88 & NGVD 29?
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Nov 4, 2020 · In a few years the key datum of the last 30 years, the North American Vertical Datum of 1988 — the datum used by federal agencies such as the Federal Emergency Management Agency and the U.S. Army Corps of Engineers — will be replaced by a new, satellite-based system. David B. Zilkoski, the former director of the National Geodetic Survey at ...
Within the boundaries of the District, the NAVD 88 elevation number is a shift of approximately 0.7 to 1.1 feet lower that the elevation in the NGVD 29 standard. This variation is due to geographical differences. For example, a water level for Lake Panasoffkee of 39.24 feet in NGVD 29 will be 38.36 in the NAVD 88 standard.
water level of 12.5 feet NGVD 29 is 11.25 feet NAVD 88. This variation affects only the numerical value for the elevation point. The volume and depth of water remains the same. Q: Are water level gauges calibrated to NAVD 88? A: Yes, all SFWMD staff gauges are now calibrated to the NAVD 88 standard. Q: Will the District continue to publish data
The North American Vertical Datum of 1988 (NAVD 88) is the official vertical datum of the United States, having superseded the older National Geodetic Vertical Datum of 1929 (NGVD 29). Both NAVD 88 and NGVD 29 are geodetic datums, a reference surface of zero elevation to which heights are referred to over a large geographic extent.
Since the establishment of NAVD 88, the preference has been for new flood hazard studies to be referenced to NAVD 88. 1.3. Other Vertical Datums . There are some limitations to NAVD 88 outside of the conterminous United States. NAVD 88 benchmarks are limited in Alaska. Many islands do not have any NAVD 88 benchmarks, have limited
