NOTATION. 
Unless otherwise noted, the various symbols used 
throughout this publication will have the following 
significance : 
H — Effective head, in feet. 
H — Loss of head at entrance of siphon, in feet. 
H-l — Loss of head due to friction in siphon, in feet. 
H 2 — Loss of head due to sudden enlargements in siphon, 
in feet. 
H 3 — Loss of head due to contractions in siphon, in feet. 
H 4 — Loss of head due to bends in siphon, in feet. 
H v — Velocity head necessary to create velocity at the 
entrance, in feet. 
V — Velocity, at throat of siphon unless otherwise noted, 
in feet per second. 
A — Area of cross section treated, in square feet. 
k — A coefficient in the formula for siphon discharge, 
ranging from 0.50 to 0.80 and usually assumed ac- 
cording to the materials of. construction and the 
form of the siphon. 
g — Acceleration of velocity due to gravity, =32.16 feet 
per second per second. 
C — A coefficient, in the formula for weir discharge vary- 
ing from 2.5 to 4.5 and determined from experi- 
ments on small model weir dams under low heads. 
p — Height of weir in feet above the bed just upstream 
from weir and applied only in the Bazin formula. 
h — Head, in feet corresponding to velocity of approach. 
L — Length of weir crest, in feet. 
Q — Quantity of discharge, in cubic feet per second. 
