3 ms·

You can power it by pumping down an equal amount of surface water

• hwillis 3y ago
  If you had a 231 meter dam, with a membrane filter at the bottom, fresh water will come out at atmospheric pressure. It then has to be carried back up to sea level. You could power that pump with another hole in the dam, but then the non-sea side of the dam would constantly be filling up with water. Once it's full, there's no longer any pressure difference to drive a pump.
• GhostVII 3y ago
  That wouldn't work because the system relies on having a pressure differential across the membrane in order to function.