Fluid Pressure 1

[PEStructural]

Can someone help me remember how to calculate a pressure from a velocity of water? I have a pump in a river that flows at 10 feet/sec. I need to calculate the pressure the water exerts on the pump to design the anchorage.

Any help would really be appreciated.

Thanks!

 

[COEngineeer]

F=1/2 rho v^2 A C
Pressure = 1/2 rho V^2 C

F= force from current
rho= density of water (not pcf, divide by gravity first)
v= velocity of water
A= X-section area of the pump
C= Drag coefficient.

C for a car is about .45. Maybe use high number like .7 or something.

http://www.krmconsultants.com

 

[COEngineeer]

I got 96 psf (unfactored). I assumed it is regular water not muddy (62 pcf).

http://www.krmconsultants.com

 

[PEStructural]

Thanks a lot for the quick response!

 

[COEngineeer]

i got 96 with C=1. I assumed the pump is like a flat plate. Dont take anything for granted K. I have been out of school kind of long and I dont encounter this equation when I design a house

http://www.krmconsultants.com

 

[PEStructural]

I checked with an hydraulics engineer in house and I got the same equation. I came up with 96.89 psf. Good job!