Changes

The output of such systems is generally too small for irrigation, (they tend to be used mainly for domestic or livestock water supply duties), but by powering the device with animals, usually oxen, sufficient water can be lifted to irrigate even through heads of 5-10m.

The rope and bucket lifter can also be adapted to include two buckets which are raised and lowered alternately. In this case the pulling animal moves in a circular path and with the help of central rotating lever, rope and pulley arrangement the buckets move up and down. Each bucket has a carrying capacity of up to 70 litres. The buckets have a hinged flap at the bottom, which acts as a valve. Guide rods are provided in the well to control the movement of the buckets. The buckets are automatically filled and emptied during operation. This device can lift about 230 litres /min from depths of up to 5 metres.