When we arrived at Hamsi village, we saw a pump pushing water from the pond below the village.
The pump does not run on electric motors but on hydropower. The villagers could not say for sure how the pump worked. It seems to work with pneumatic pressure due to the air tank. But the sound of a rocket ringing every three seconds. Only the air tank and the inlet and outlet pipes are out, and the lack of a compressing accessory is unbearable.

Thanks to the Internet, we know a lot about ram pumps. The basis is the transfer of fixed energy. Confirm energy can be expressed in p.e = mgh. The potential energy of 1000kg of water at 1m height is the same as p.e of 10kg of water at 100m height. Therefore, if the efficiency is 1, it can deliver 1000kg of water from 1m height to 100m height without using external energy. Due to the other loose, the efficiency could not be 1 but only 0.8, so 8kg of water could be transported to that height

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