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A treadle pump is a human-powered suction pump that sits on top of a well and is used for irrigation. It is designed to lift water from a depth of seven metres or less. The pumping is activated by stepping up and down on a treadle, which are levers, which drive pistons, creating cylinder suction that draws groundwater to the surface. https://commons.wikimedia.org/wiki/File:Treadle_pump_GB_drawing.jpg ==Application== Treadle pumps free farmers from dependence on rain-fed irrigation and helps farmers maximize return on their small plots of land. The treadle pump can do most of the work of a motorized pump, but costs considerably less. Pump prices including installation range between US$20 and $100. Because it needs no fossil fuel (it is driven by the operator's body weight and leg muscles), it can also cost less (50%) to operate than a motorized pump. It can lift five to seven cubic metres of water per hour from wells and boreholes up to seven metres deep and can also be used to draw water from lakes and rivers. Many treadle pumps are manufactured locally, but they can be challenging to produce consistently without highly skilled welders and production hardware. Treadle pumps are most commonly used by farmers on small plots of land, typically about the size of an acre. They are also used in poor countries and small villages such as: villages in Africa, small farmers in Asia, and anywhere else where money is an issue. Compared to bucket irrigation, the treadle pump can greatly increase the income that farmers generate from their land by increasing the number of growing seasons, by expanding the types of crops that can be cultivated, and improving on the quality of grown crops. https://commons.wikimedia.org/wiki/File:Treadle_pump,_original.jpg 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「treadle pump」の詳細全文を読む スポンサード リンク
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