my idea is to simply construct a pump having just the minimal and essential parts to conclude any normal pumping device but its propellers or energy consuming device would move or work in motion with the flow of that water itself or the canal where current is there or a waterfall, putting a lineup of pumps there and thereby connecting the pipes with them till the farms. we can also use the compressed biogas and pressurized form of it or rather any gas and also we may use wind mills to power these pump and can also be connected with the ground water.
Energy [R]evolution: A Watershed Moment in India
SO BASICALLY THESE ARE 3 IDEAS, which i just thought of and wanted to share
the idea would be to just make them sturdy and wear and tear proof to handle the water effects, and it's force.