Changes

A single dhone will lift 7.5 litre/sec at a lift of 0.75m (115gall/min at 30 inches), which reduces to about 2 litre/sec (30 gall/min) at 1.5m (or 60inches) head. Therefore the dhone will move more than twice as much water as a swingbasket at low lifts, moreover using the power of only one person rather than two. Many Bangladesh farmers try and use a single stage dhone at an overly high lift, and lose a lot of performance as a result; the optimum lift per stage isapproximately lm is approximately 1m (40in). <ref>[http://www.scribd.com/doc/57095012/60/Traditional-Water-Lifting-Devices Water Lifting Devices]. FAO, 1986.</ref>