Hydraulic ram, ( impulse pump ).
https://www.emergency-wash.org/water/en/technologies/technology/hydraulic-ram-impulse-pump
👉🏼 PDF: https://app.box.com/s/pdtjfvl866r22kpe6lalwuwzngioz5rv __ Hydraulic Ram or Impulse Pumps convert the difference in elevation between the feed pipe intake (e.g. from a nearby river or flow from an elevated reservoir) and the pump itself into kinetic energy that moves water through the delivery pipe. Impulse Pumps require little to no energy input other than a flowing water source and can reliably provide pressurised water from that existing source (including spring water). This technology is mainly applicable during the stabilisation and recovery phases of an emergency.