Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Bernoulli's equation. Need help asap!

  1. Jun 17, 2010 #1
    1. The problem statement, all variables and given/known data
    A very simplified schematic of the rain drainage system for a home is shown. Rain falling on the slanted roof runs off into gutter around the roof edge it then drains through downspouts into a main drainage pipe M below the basement which carries the water to an even larger pipe below the street. Apply the following:

    1.)the downspouts have h1= 11m
    2.)the floor drain has height h2=1.2m
    3.)pipe M has radius 3cm
    4.) the house has side width w=30 m and front length L=60 m
    5.) all the water striking the roof goes through pipe M
    6.) the initial speed of the water in a downspout is negligible
    7.) the wind speed is negligible

    At what rainfall rate, in centimeters per hour, will water from pipe M reach the height of the floor drain and threaten to flood the basement.

    2. Relevant equations

    p+ .5 rho v^2+rho gh=p+.5 rho v^2+rho gh

    3. The attempt at a solution
    A=a so V=V

    Attached Files:

  2. jcsd
  3. Jun 17, 2010 #2
    I also figured out that the v at the end of the pipe of length h1= 146 cm/s by using v^2=v0^2+2gh
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook