Logan Martin Lake Topics: Martin pool elevation datum

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	Name:	Arnold -
	Subject:	Martin pool elevation datum
	Date:	11/12/2007 6:54:03 PM

Most folks were not aware of this. Elevations using mean sea level (msl) as a reference base are commonly used for most points of interest such as lakes and reservoirs. The World Geodetic System 84 (or WGS 84) datum is the most commonly used inland coordinate system that relates points on the earths surface is a fairly accurate coordinate system that approximates the oblate ellipsoid shape of the earth. Actually, average mean sea level is the basis from which elevation is measured.

This may sound redundant but mean sea level is usually the diurnal difference in sea level due to tidal change and the average of that takes into account changes in the diurnal difference due to the change in axis declination of the earth relative to the moon and sun during is annual trek around the sun. The accepted convention is to drop the 'average' and just say mean sea level.

Why is the elevation data for Martin different? When Martin was built, mean sea level was not use as the reference datum for pool elevation. They used the topographic convention of topographic survey datum of that time and it became codified into the Federal Power Commission documentation and more recent Federal Energy Regulatory Commission (FERC) documentation, US Army COE operation manuals and related APCo operations.

If we ever see a full pool here again, it should be stated as 491 ft. average mean sea level. If I see 491 ft. msl, I'll jump for joy anyway. Just get'r up!!!!

Other messages in this thread:

View Entire Thread

Martin pool elevation datum - Arnold - 11/9/2007 12:38:17 PM

Martin pool elevation datum - Osms - 11/9/2007 8:23:04 PM

Martin pool elevation datum - Arnold - 11/10/2007 2:58:00 PM

Roger, Thanks - Osms - 11/10/2007 5:16:45 PM

Martin pool elevation datum - Ulysses E. McGill - 11/11/2007 1:51:29 PM

Martin pool elevation datum - Arnold - 11/12/2007 6:54:03 PM

Martin pool elevation datum - JIM - 11/12/2007 7:32:22 PM

Martin pool elevation datum - Arnold - 11/13/2007 9:36:11 AM

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