What defines an ordinary high water line?

The ordinary high water line is defined as the commonly designated water mark for non-tidal waters. This definition is important because it establishes the boundary between private property and public trust lands, impacting land use and ownership rights. The ordinary high water line reflects the point where the water has been at certain times, which helps define the rights and responsibilities regarding waterfront property.

In the context of Florida law, recognizing the ordinary high water line is crucial for various legal and environmental reasons, including waterfront development, zoning, and environmental protection. Non-tidal waters can fluctuate with seasonal changes or precipitation, creating a stable reference point for property boundaries.

The other options, while related to water levels, do not accurately depict the ordinary high water line. For instance, the permanent water level of a lake reflects a different concept and does not consider the fluctuations over time. Similarly, the mark of high tide during stormy conditions refers specifically to tidal areas and their peaks during extreme weather, which is distinct from the ordinary high water line's purpose. Lastly, the lowest point of riverbanks does not serve as a recognized boundary and is not a fixed elevation that can be used to determine property lines in the way that the ordinary high water line can.