'Good vibration' hand pump monitors keep and eye on water levels in wells. "The simple up-and-down motion of hand pumps could help scientists secure a key water source for 200 million people in Africa." - The BBC -
'Good vibration' hand pump monitors keep and eye on water levels in wells. "The simple up-and-down motion of hand pumps could help scientists secure a key water source for 200 million people in Africa." - The BBC -
Reserved Water Storage 