Flow Stage and Pore Pressure
Stage is measured by a non-contact sonic distance meter suspended over the channel. The device measures the distance from the sensor to the surface below. When no runoff is present, the measurement surface is the surface of the channel bed. Distance measurements are converted into a stage above a datum corresponding to 0.5 m below the elevation of the pressure transducer mounted in the channel bed. Changes in stage detected by the sensor when no runoff is present are usually caused by infilling of the channel by dry ravel processes.
A pressure transducer vented to the atmosphere is used to measure fluid pressures in the pores of the bed directly beneath the stage gage. The pressure transducer is mounted in the bedrock and often buried beneath a 25-cm layer of loose bed material. Pressure is displayed as an equivalent depth of water in meters.
Stage, pore pressure, and rainfall for last hour
Stage, pore pressure, and rainfall for last 3 days
Stage and signal quality for last day
