Something I totally overlooked in my earlier reply-
My understanding is that Florida Statutes, Chapter 177, part II, Coastal Mapping, deals solely with Oceans & other tidal boundaries. Also, as the term MHWL (mean high water line) is used therein my understanding is it applies only to coastal boundaries (i.e. oceans & other tidal boundaries).
In this regard, I discovered the following definition: Mean high water line (MHWL) – The mean high water line is the tidal boundary. The mean high water line is the boundary line between private and sovereign lands on navigable tidal waters of the state.
Also, my understanding is the establishing of the mean high water line is arrived at completely different from the OHWL. To wit:
The mean high water line is a local elevation datum that is determined by averaging all the high tides over a tidal epoch (18.6 years). Where this datum intersects the beach is the mean high water line.
However, my concern is with a fresh water lake boundary. I discovered the following definition (as applied to Florida):
Ordinary high water line (OHWL) – The ordinary high water line is the boundary line between private and sovereign lands on navigable non-tidal waters of the state, i.e., usually inland lakes and streams.
Apparently, the location of the OHWL can not be arrived at with the degree of precision possible with MHWL determinations. Somewhat akin to a wetland boundary location, the OHWL apparently can be somewhat subjective.
Keith,
I actually had the privilege of speaking to Mr. Simpson back in January, when I purchased my book, upon the recomendation of DDSM (Dan Robinson). He was a very nice guy, and sent the book right away. It was shrink wrapped when I got it. I wish I would have thought to ask him to sign it.
I have looked at it, and it is a very imformative book. I look forward to actually having a chance to read it over the winter.
Jimmy
Jerry,
Thanks for your kind response.
I should have been more clear. All the work contemplated as well as everything already done is on-the-ground. The topographical survey map was a reference to a topographical survey map just completed by my company. This topographical survey map (the map which was drawn by my company, and was based on field work also done by my company) shows 1 foot contour intervals starting about 500 feet upland, and continuing out about 300 feet into a fresh water lake.
(The following paragraphs added due to a lot of folks misunderstanding the nature of the line type. I think most folks were thinking of MHWL.)
In Florida, we are accustomed to two (well, probably more than 2) specific water boundary lines. OHWL (ordinary high water line) and MHWL (mean high water line). The MHWL term is a reference to a tidal boundary (oceans etc.), while OHWL refers to a non-tidal boundary (fresh water). MHWL determination has to do with tidal gauges, specific elevations, etc., while OHWL is a more subjective line dealing with observations/appearances, etc.
Also, 2 different terms: OHWM and OHWL. From my understanding OHWM is based on Corps of Engineers language/definition. While OHWL is based on State of Florida language/definition. While the terms may be closely related, from what I am seeing the 2 lines are likely to be 2 different locations depending upon which definition is used.
Thanks Keith,
I appreciate very much your advice/suggestions.
We usually contract out for a wetlands expert to determine and flag OHW. Not sure why, since it is pretty obvious on the ground, generally. You are right, MHW or MHHW and other tidal lines are contours that are calculated via tide gauges and various publications, and have nothing to do with OHW.
But, that is what we do.
Cantact Jeffery Cooner at Cooner and Assoc. He has a great deal of experience in determining OHW lines in Florida.
Interesting discussion...have had some experience here surveying in New England. As Mr. Knight points out you have to be on the ground and have knowledge of what determines in different applications. Have surveyed along rivers at different times of the day with different levels and inundation due to tides, examining vegetation and looking for the difference in scarps. Along lakes examining shorelines and difference in berms, changes due to waterworks improvements, dams....Along ocean shoreline subject to tides tracing the stain along the rocks. Canoeing up good sized streams to establish apparent centerline. There is a lot to it and as other highly experienced surveyors have pointed out it would be best to consult with a knowledgable surveyor.
