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Dhone

1,081 bytes added, 04:05, 22 November 2012
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- Low to medium efficiency (20-50%)
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==Construction, operations and maintenance==
[[Image:Dhone drawing.jpg|thumb|right|250px|Mechanics of a dhone, including the view of the internal flap valves. Photo: Intermediate Technology Publications]]
 
Instead of using a treetrunk, a dhone may be made of several planks of wood which can be assembled in the field with bolts. Galvanized iron sheets can also be used. Very large dhones should not be used as the discharge is reduced with increasing dhone volume (presumably because some of the input watts are wasted in manipulating the larger/heavier device (plus water) and so the time per cycle is disproportionately increased).
 
Note also that it has already been observed that with increased lifts, the overall efficiency of water lifting is considerably reduced. This is likely to be due to a greater spillage with increased lift, in addition to impaired ergonomics.
 
==Costs==
In Bangladesh, the higher initial costs of the dhone is the factor which inhibits its widespread adoption. There continues to be scope for some innovation in this method of lifting water.
==Field experiences==
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