Related Clues:
- Water collectors
- Water pits
- Liquid-draining pits
- Cesspools
- Drainage pits
- Liquid-drainage pits
- Oil reservoirs in engines
- Water tanks
- Is it the birds that would hold water after a century?
- Is it the water bird that's following a hundred to where there is water to be found?
- Drainage areas
- Water pump types
- Add an extra note for oil deposits
- Calculations covering pressure in oil deposits
- Has around million oil wells