253
OF ENGINEERING FORMULÆ.
Delivery of Wateb in Pipes. (Eytelwcin.)
D = Diameter of pipe in inches.
H = Head of water in feet.
L = Length of pipe in feet.
W = Cubic feet of water discharged per minute
W = 4-71 V7 . D = 0-538 V-^-2
■L* H
HaWKSLEY’ö FOliMLLA FOK THE DELIVEKY OS’
Wateb in Pipes.
G = Number of gallons delivered per hour.
L = Length of pipe in yards.
H = Head of water in feet.
D = Diameter of pipe in inches.
Neville’s General Fokmcla
v — 140 drs- 11 i'rs- velocity in feet per
second.
r being the hydraulic mean depth in feet and s
the sine of the inclination, or the total fall divided
by the total length.
. In cylindrical pipes, v multiplied by 47-124 d2,
gives in cubic feet the discharge per minute, or by
293-7286 cP the supply in gallons per d
being the diameter of the pipe in feet.
For greater diameters than those given in the
Table divide the .»proposed diameter by 4, and
twice the velocity opposite to the quotient in the
Table will be the required velocity; or the cor-
responding supply multiplied by 32 will be the
approximate supply in gallons per minute.