Lifting Devices for Irrigation
At least 25% of the 5000 new wells that are being dug every year in Karnataka
are fitted with traditional water lifting devices such as the Yatha, Kapile
or Persian Wheel, operated by human or animal power. The lift capacity of
such devices is limited to about 1 meter for human powered devices, and
10 metres for bullock-powered devices, with discharge in the range of 9,000-18,000
litres/hour. The centrifugal pumps used for water lifting for irrigation
can pump about 35,000 litres/hour, but in majority of cases, this capacity
exceeds the yield of the well. There is, therefore, a need for water lifting
devices capable of handling a range of lifts from 1 to 10 metres and delivering
upto about 25, 000 litres/hour.
Two different designs of water lifting devices had been taken up for investigation under this project. One of these is based on the Archimedian screw and the other is based on the diaphragm pump utilizing two scooter tyres. The objective is to design, fabricate and carry out tests on these two versions with a view to establish their feasibility or otherwise as human or animal powered water lifting devices for purposes of minor irrigation.