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.- 



