(50g) Civil Engineering

[CosmicTruth]

(05-30-2014 07:55 PM)Eddie W. Shore Wrote:  Horizontal Pipe Discharge

Variables:
X, Y, and D (diameter of the pipe) are in inches. Flow (Q) is calculated in GPM (gallons per minute).

Q ≈ .25974 * π * D^2/4 * X * √( g /(2 * Y))

Where
g = 9.80665 m/s^2 ≈ 386.08858 in/s^2
1 in^3/s ≈ .25974 gal/min

Source:

Gary P. Markey. Lecture 14: Flow Measurement in Pipes. BIE 5300/6300 Lectures
Utah State University - Open Courseware

http://ocw.usu.edu/Biological_and_Irriga...nPipes.pdf

Program HPD
<< "Hose Diameter (in)" PROMPT
"X (in)" PROMPT
"Y (in)" PROMPT
→ D X Y
<< π D SQ * X * 4 / →NUM
386.08858 2 Y * / √ *
.25974 * "Flow (GPM)" →TAG >> >>

Example:
D = 2.5 in
X = 8 in
Y = 4 in

Result:
Flow ≈ 70.85936 Gallons per Minute

This is good stuff, the X and Y is Horizontal and Vertical distance measured in inches. it may be better to do these measurements using a V-notch weir.

check out http://www.lmnoeng.com/Weirs/vweir.php & http://www.usbr.gov/pmts/hydraulics_lab/...07_07.html