system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why do we store water in towers rather than underground tanks like we do with gasoline for ex.
gpt
>Why do we store water in towers rather than underground tanks like we do with gasoline for ex.  
  
Water towers are not for storage, water towers provide the local grid with **pressure**. They regularly get replenished by pumps, of course, but having a small amount of water in a tower at a relative height to its grid instead of in a large reservoir at or below grid level means you don't have to have those pumps running *constantly*.