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Counterpoise lift

1,120 bytes added, 01:56, 16 October 2012
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''Don'' is also a similar type of device which is used in west Bengal and neighbouring areas to lift water up to a height of 1.2 meters. It consists of a boat shaped trough, closed at one end and open at the other, made of wood or galvanized iron sheets. The trough oscillates on a fixed centre and its closed end is alternately dipped into water and raised. The water flows into the field channel through the open end of the trough.
 
The ''pi cottah'', used primarily in India, is similar to the shaduf but is operated by two people, one of whom acts as a moving counter weight to eliminate much of the strenuous work of returning the water container against a stationary counter weight. Although it can lift water 5-8 m (16-26 ft), its output is small, and it is used primarily to water small vegetable plots.
 
Bucket systems may also be adapted to animal power to increase flow, such as with the [[Bucket_hoists,_Windlasses,_Mohtes_and_Water_Skips|mohte]], or self-emptying bucket. This traditional device employs either a tipping action or simple flap valves in the bucket or bag to discharge the water at lifts of 5-10 m (16-33 ft). The system can be arranged for the animal to walk back and forth in a straight line or in a circle, thus requiring less supervision.
 
The low-lift ''dhone'', or see-sawing gutters from Bangladesh, can deliver about 300 liters/min (80 gal/min) at a 1 m (3.3 ft) lift. This device uses flap valves and can be operated by a single person shifting the weight back and forth at the fulcrum.
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