Tedious job to perform manually.
"Vikram developed a long train of pulleys and belts. One end he linked to a cycle and the other end he connected the Pump. He pedaled the cycle and the pump operated in full swing. He managed to irrigate 2 acres with his sustainable innovation and harvested the crop after few months."http://www.pallesrujana.org/viikramrathore-=2014.html
Link: Pedal operated, affordable, decreases labour, saves time
Problem Scale: Rural regions of India