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Q = x d in gpm (us)
Example :
'd' = 36 inches
'r' = 1.5 inches
Then Q = x d gpm (us)
= 3.14 x 1.5 x 1.5 x 36 gpm (us)
= 254.34 gpm (us)
= 15,260 gallons per hour (us)
= 12,200 gallons per hour (Imperial
This method is really an extension of the Jet method (Karanth, KR, 2004). A
fairly accurate determination of flow from full open horizontal or inclined pipes
can be made by measuring the distance, parallel to the pipe, traveled by the
trajectory of water for a vertical fall of 30 cm. and using the value in conjunction
with that of diameter of the pipe in the formula. [Karanth, KR. 2004]
Q = 0.017 CP
Where Q = flow of water, in m3/s
C = Constant
P = distance traveled by the trajectory for a 30cm vertical drop
from the discharging pipe.
