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Similarly, the mean higher high water (MHHW) is the average height of the highest tide recorded at a tide station each day during the recording period. It is used, among other things as a datum from which to measure the navigational clearance, or air draft , under bridges.
One kind of high water mark is the ordinary high water mark or average high water mark, the high water mark that can be expected to be produced by a body of water in non-flood conditions. The ordinary high water mark may have legal significance and is often being used to demarcate property boundaries . [ 8 ]
The vessel's clearance is the distance in excess of the air draft which allows a vessel to pass safely under a bridge or obstacle such as power lines, etc.A bridge's "clearance below" is most often noted on charts as measured from the surface of the water to the underside of the bridge at the chart datum Mean High Water (MHW), [3] [4] a less restrictive clearance than Mean Higher High Water ...
Record high water levels were measured in St. Petersburg, Old Port Tampa, Venice Inlet, Cedar Key and Clearwater Beach. ... But tidal gauge measurements above the mean higher high-water line ...
Storm surge for Sarasota and Manatee counties is projected at 3 to 5 feet above the mean high water line today. A storm surge of 6.04 feet was recorded at Port Manatee at 12:30 a.m. Friday but had ...
The presence of a high water table has produced a karst landscape. The limestone hosts the Florida aquifer, which reaches the surface near the coast. Steady discharge from the aquifer supports the discharge of the many springs feeding rivers and streams along the coast and maintains a high water table near the coast. [10]
Shoreline indicators may be morphological features such as the berm crest, scarp edge, vegetation line, dune toe, dune crest and cliff or the bluff crest and toe. Alternatively, non-morphological features may be used such as water level (high water line (HWL), mean high water line) wet/dry boundary and the physical water line. [30]
The Alachua County boundary extends to the ordinary high water line (normally the shoreline), which is 141 feet (43 m) above mean sea level. It forms the headwaters of the Santa Fe River, exiting from a "little" northern area (Little Lake Santa Fe) emptying into the Suwannee River.
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