The circular prefabricated channel is essentially a mo-
of the hydraulic unit designed to lift, upstream of the
tion, the level of the fluid during its outflow. The knocker
of the fluid upstream of the circular prefabricated channel,
ta or decreases as a function of the amount of fluid flowing
on it. The head measured by a level transmitter
it is subsequently used to calculate the value of the
instant flow. Its main use is in pipes or in
pipes accessible through the hatches. The ease of in-
installation, and the installation costs contained, are the
reason for the growing number of applications of this system
but of measurement of the instantaneous flow rate.