The girls wore masks and gloves and measured the breadth and depth of the drainage pipe at 23 cm and 9 cm respectively
After that, they noted the water speed by throwing a piece of paper into the flowing water and noting the time it took to cover a distance of five metres. The approximate average speed of the water was about 30 km/hour
They then constructed a 3 inch radius turbine which was later connected to a 100 rpm gear motor. To rotate the turbine faster, each blade in the turbine was bent at 45 degrees
The girls also constructed an adjustable stand to half sink the turbine in order to facilitate faster rotation
At its final stage, the equipment was mounted and installed on the platform
The girls calculated and monitored the power generated by the motor at equal intervals from 6 in the morning to 10 in the night
Currently, the electricity generated by the engine is an average between 8 volts to 9 volts, which allows one to charge cell phones, operate LED lights and play the radio. It save battery too!
"We can produce power easily at a low cost even from the drainage water. Nothing is a waste unless we make a way to make it useful," their teacher Priyadharshini said Better India.
The girls, as part of their pilot project, now aim to install a LED street light in Lawspet.