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Water stagnation
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Water stagnation : ウィキペディア英語版
Water stagnation

Water stagnation occurs when water stops flowing. Stagnant water can be a major environmental hazard.〔http://www.pbs.org/wgbh/americanexperience/features/general-article/panama-fever/〕
==Dangers==
Malaria and dengue are among the main dangers of stagnant water, which can become a breeding ground for the mosquitoes that transmit these diseases.
Stagnant water can be dangerous for drinking because it provides a better incubator than running water for many kinds of bacteria and parasites. Stagnant water is often contaminated with human and animal feces, particularly in deserts or other areas of low rain.〔(WHO.int )〕
Stagnant water may be classified into the following basic, although overlapping, types:-
Water body stagnation : stagnation in swamp,lake,lagoon,river, etc.
* Surface and ground waters stagnation ;
* Trapped water stagnation. The water may be trapped in human artifacts (discarded cans, plant pots, tires, dug-outs, roofs, etc.), as well as in natural containers, such as hollow tree trunks, leaf sheath etc....
To avoid ground and surface water stagnation, drainage of surface and subsoil is advised. Areas with a shallow water table are more susceptible to ground water stagnation due to the lower availability of natural soil drainage.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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