# Bernoulli's equation. Need help asap!

1. Jun 17, 2010

### mb218

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
AV=av

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

#### Attached Files:

• ###### physics.jpg
File size:
15.3 KB
Views:
156
2. Jun 17, 2010

### mb218

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

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook