Many large open channels have been historically monitored using a flume or weir structure that has been "rated" using empirical data. Typically this rating is based on the depth of the water running over/through the structure. In recent times, the use of flumes and weirs has been negated somewhat by the advent of cheaper area/velocity methods, such as the MACE Doppler ultrasonic. However, thousands of rated structures are still used worldwide in diverse applications such as large open irrigation channels or small Parshall flumes in wastewater treatment plants.
The HydroMace 3000 includes a powerful weir and flume look-up table that enables the user to interface downward looking ultrasonic or submerged depth sensors, and convert the depth readings to flow rate readings. The HydroMace includes equations for all major flume/weir types including:
Furthermore, with the optional FloSI telemetry interface, critical information can be sent wherever it is needed most.