Passive water pump
Detailed description of design, construction, materials here: http://vimeo.com/26307419 Additional notes here: http://www.youngfarmers.org/farmhack-projects-paddlewheel-powered-pump/
Detailed description of design, construction, materials here: http://vimeo.com/26307419 Additional notes here: http://www.youngfarmers.org/farmhack-projects-paddlewheel-powered-pump/