Drifting Velocity Sensor

Drifting Velocity Sensor

29. Drifting Velocity SensorThis scattergraph displays data from a flow monitor with a drifting velocity sensor.  Note that the reported flow velocity drifts over a wide range without a corresponding…

Drifting Depth Sensor

Drifting Depth Sensor

28. Drifting Depth SensorMost flow monitoring data can be described by the Manning Equation using either the Design Method, the Lanfear-Coll Method, or the Stevens-Schutzbach Method.  Data that do not…

Undular Jump

Undular Jump

27. Undular JumpA hydraulic jump or other transcritical flow condition may reduce the accuracy of a flow monitor.  However, this effect is not strictly limited to critical flow (Fr =…

Hydraulic Jump

Hydraulic Jump

26. Hydraulic JumpThis scattergraph is from a site that experiences a hydraulic jump.  This condition occurs when flow transitions from supercritical to subcritical flow.  In this example, the hydraulic jump…

Iso-Froude Lines

Iso-Froude Lines

25. Iso-Froude LinesThe Froude Number (Fr) is a dimensionless number used to describe flow conditions and is analogous to the Mach Number defining supersonic flight.  If the Froude Number is…