At what point does a pond become a lake?

For example, if sunlight can reach the bottom of the entire body of water, it's generally considered a pond, according to the National Park Service. Conversely, if the body of water is deep enough in some places that sunlight cannot penetrate it, it's generally considered a lake.



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The definition of lakes and why there's no standardization A pond is a body of water less than 0.5 acres (150 square meters) in an area or less than 20 feet (6 meters) in depth. A lake is defined as a body of water bigger than 1 acre (4,000 m²), although size is not a reliable indicator of its water quality.

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It may surprise you to know there is no technical difference between lakes and ponds, according to the National Park Service(Opens in a new window). However, a general rule of a thumb is if a body of water is large and deep it's a lake and if it's short and shallow it's a pond.

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If left alone, the pond or lake will eventually fill in completely, and become a swamp or wetland at best. Most existing farm ponds fall in the eutrophic category and need help quickly to slow the aging process.

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In the U.S. a pond is defined as a body of water with a surface area of less than ten acres (40,000 square metres). By that definition, a puddle could be classed as a pond. On the other side of the 'Big Pond' (aka the Atlantic Ocean), in some parts of England, a pond is only called a pond if it is man-made.

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A typical lake has three distinct zones (limnetic, littoral and the benthic zone; Fig. 11) of biological communities linked to its physical structure.

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Along with water quality, it is important that the physical characteristics of a pond are appropriate for swimming. The depth of the pond can often determine if it is safe to swim. In addition, sunken trees and submerged rocks can be invisible from the surface of the water and can pose a danger to swimmers.

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