It extends from the Brunswick River to Lennox Head, and from mean high water out to three nautical miles from the coast or islands.
22.
The berms are 325 feet wide at the base and 25 feet wide at their summits, rising 6 feet above mean high water level.
23.
They measured the mean high water mark on a 1 : 10000 map and published the result to seven ( count'em ! ) significant figures.
24.
The right hand line continues beyond the Mean High Water mark at Snipe Point onto rocks which are submerged at some times, some even daily.
25.
Consequently, bridge clearances etc . are given relative to a datum based on high tide, such as Highest Astronomical Tide or Mean High Water Springs.
26.
The beach is mostly a storm bank of stones and gravel above Mean High Water with a large mostly sandy beach appearing when the tide is lower.
27.
A minimum of vertical clearance must be maintained from the mean high water line at the main span, requiring the roadway to be raised approximately higher than its previous level.
28.
:The reason I invoked " fractals " was precisely because I assumed that the USGS would use the mean high water mark or some other well-defined standard for tidal extent.
29.
The lantern was positioned about above MHW-Mean High Water . ( The height of a light is measured from MHW to the focal plane of the light source or bulb.
30.
These indicators are based on water level including the high water line, mean high water line, wet / dry boundary, and the physical water line ( Pajak & Leatherman 2000 ).
