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The Withlacoochee River or Crooked River is a river in central Florida, in the United States. It originates in the Green Swamp , east of Polk City , flowing west, then north, then northwest and finally west again before emptying into the Gulf of Mexico near Yankeetown .
The river then flows into Florida for 1.34 miles before returning into Georgia for an additional 2.44 miles. It then returns to Florida, forming the northeast boundary of Madison County, Florida and the western boundary of Hamilton County, Florida and eventually merges with the Suwannee at Suwannee River State Park west of Live Oak .
A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
The Little River was also known historically as the Ockolocoochee River. The Little River rises in northwestern Turner County, Georgia , 7 miles (11 km) northwest of Ashburn . The river flows southeast into Tift County , passing west of Tifton , then turns more southerly as it becomes the boundary between Colquitt and Cook counties.
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
The fairway depth of a river varies with the season, so some standardized depth value is used, usually the one corresponding to the low navigable water level (LNWL) defined as the water level that the river stays above during almost the entire navigation season: statistically, the level shall stay below the LNWL for 20 ice-free days per year ...
The use of bathymetry and the development of bathymetric charts dates back around the 19th century BC to ancient Egypt.Depictions on tomb walls such as the bas-relief carvings of Deir al-Bahri commissioned by Queen Hatshepsut in the 16th century BC show ancient mariners using long slender poles as sounding poles to determine the depth of the Nile River and into the Nile River Delta.
Therefore, mean depth figures are not available for many deep lakes in remote locations. [9] The average lake on Earth has the mean depth 41.8 meters (137.14 feet) [9] The Caspian Sea ranks much further down the list on mean depth, as it has a large continental shelf (significantly larger than the oceanic basin that contains its greatest depths).