A pond is a body of standing water, either natural or artificial, that is usually smaller than a lake. They may arise naturally in floodplains as part of a river system, or they may be somewhat isolated depressions (examples include vernal pools and prairie potholes). They might contain shallow water with marsh and aquatic plants and animals. The type of life in a pond is generally determined by a combination of factors including water level regime (particularly depth and duration of flooding) and nutrient levels, but other factors may also be important, including the presence or absence of shading by trees, presence or absence of streams, effects of grazing animals, and salinity.Ponds are frequently human-constructed. In the countryside, farmers and villagers dig a pond in their backyard or increase the depth of an existing pond by removing layers of mud during the summer season. A wide variety of artificial bodies of water is classified as ponds. Some ponds are created specifically for habitat restoration, including water treatment. Others, like water gardens, water features and koi ponds are designed for aesthetic ornamentation as landscape or architectural features. Fish ponds are designed for commercial fish breeding, and solar ponds are designed to store thermal energy. Treatment ponds are used to treat wastewater. Standing bodies of water such as puddles, ponds, and lakes are often categorized separately from flowing watercourses, such as brooks, creeks, streams or rivers. Nutrient levels and water quality in ponds can be controlled through a natural process such as algal growth, or through artificial filtration, such as an algae scrubber.
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