Water drain rate from barrel

  • #1
LocktnLoaded
32
0
I've got a math problem, that's way over my head, here it is.
Figurativly I have a 33 gallon barrel and it has a one inch hole in the bottom, if the barrel is full of water, how many gallons would escape a minute, the top is open, I need to know to figure out how much water being pumped in would be needed to keep the barrel full?
If it turns out to be a simple answer, what would the result be if it was a two inch hole?
 

Answers and Replies

  • #2
lightgrav
Homework Helper
1,248
30
You have to put in the same amount as is leaving.
Unless you know the depth (under water) of the hole,
you can't even start (the speed is 0 if depth is 0).
 
  • #3
LocktnLoaded
32
0
Not sure what your saying , but the barrel is full of water when the spigot at the bottom is opened, and the extra water is being fed into it at the top, at this same rate, from another source.
 
  • #4
LocktnLoaded
32
0
reply

Although I can't figure it out, I've seen in these forums that it can be calculted how long it would take a cubic mile by a cubic mile container of water to finally drain out of a one inch hole, is this a different mindset?
 
  • #5
mukundpa
Homework Helper
524
3
It the barrel remain full you need height of the barrel to find the velocity of water draind given by v = sq.rt.(2gh)
then the volume flow rate will be A*v should be equal to the water to be pumped in where A is the cross-section area of the hole.
 
  • #6
LocktnLoaded
32
0
reply

Just found this http://www.ap.stmarys.ca/demos/content/fluids/pressure_head/pressure_head.html [Broken]
Thanks
 
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