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Fluid dynamics and pressure type question.

  1. Apr 26, 2010 #1
    Let's say I want to install a 55 gallon drum on the ground to collect rain water as it runs off the roof. What if for some strange reason I wanted to run a hose from a spigot in the bottom of the drum back up to water the plants on the roof deck (I'm looking into green roofs). Could we just calculae the pressure in pascals and then determine if that would be enough force to push a hosefull of water back up to the roof?
  2. jcsd
  3. Apr 26, 2010 #2


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    Staff: Mentor

    Pressure is just the weight density times height. Geometry - such as concentrating a large pressure into a small hose - plays no role whatsoever, so what you are describing can't be done.
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